Abstract: Electron-deficient fluorous porphyrin molecules may have dual functions of light harvesting and electron accepting or donating and may be ideally suited for use in organic solar cells. Methods of making electron-deficient fluorous porphyrin molecules are described.

Abstract: The invention relates to a polymer composition which absorbs infrared radiation (IR), containing a transparent thermoplastic plastic, an inorganic infrared absorber, also referred to as IR absorber hereinbelow, at least one inorganic nano-scale pigment, and the combination of at least two organic coloring agents of a specific structure, and to the preparation and use of the polymer compositions according to the invention and to products produced therefrom.

Abstract: Reactive dye mixtures comprising at least one red dyeing dye and at least one blue, yellow, orange or brown dyeing dye and their use in methods for the dichromatic or trichromatic dyeing or printing of cellulosic fiber materials are described. The reactive dye mixtures yield dyeings or prints having good reproducibility and good all-round fastness properties.

Abstract: The present invention relates to organic coloring agents with a high color stability to weathering for thermoplastics. The invention furthermore relates to a polymer composition containing at least one thermoplastic and at least one organic coloring agent, preferably a combination of at least two organic coloring agents, of a specific structure. The invention moreover relates to the use of the coloring agents according to the invention for coloring polymer compositions, in particular for transparent formulations such as are required for the production of panes for use in buildings, motor vehicles and track vehicles or aircraft.

Abstract: In a dyeing method of an aluminum-based member, a first color forming material is held in a hole of a first region of an anodized film, a second color forming material is held in holds of a second region that is smaller than the first region by diagonally spraying, When the second colored layer is formed, a gradation region is formed in a boundary with the first region and the second region, and the hole are closed.

Abstract: This invention relates to process for preparing fluorinated dyes selected from the group consisting of compounds of the general formulae (I) and (III) and mixtures thereof by reacting the corresponding compounds which do not have R12 or R30 as substituents with compounds of the general formula R12A or R30A where A is selected from the group consisting of I and Br, the compounds obtained from said process and the use of these fluorinated dyes in electrophoretic displays.

Abstract: Dye mixtures, comprising at least one dye of formula and at least one dye from the group of formulae wherein the substituents are defined in the specification.

Abstract: In a dyeing method of an aluminum-based member, a first color forming material is held in a hole of a first region of an anodized film, a second color forming material is held in holds of a second region that is smaller than the first region by diagonally spraying, When the second colored layer is formed, a gradation region is formed in a boundary with the first region and the second region, and the hole are closed.

Abstract: A composition comprising (A) at least one nickel complex pigment and (B) at least one disperse dye of formula (1) or (2) wherein R1 is hydrogen, hydroxy or a radical —NHCO—R6 wherein R6 is C1-C6alkyl or unsubstituted or C1-C4alkyl- or halo-substituted phenyl, R2 is hydrogen, hydroxy or a radical W—R7 wherein W is —NHCO— or —S— and R7 is C1-C6alkyl or unsubstituted or C1-C4alkyl- or halo-substituted phenyl, R3 is hydrogen, R4 is hydrogen or hydroxy, R5 is hydrogen, or R3 and R4 together form the radical of formula wherein the rings A and B, independently of one another, may carry further substituents, R8 is hydrogen or —CO—C2-C6alkyl wherein the C2-C6alkyl radical may be substituted by carboxy, or a radical wherein R11 is hydrogen, C1-C4alkyl, hydroxy, carboxy or halogen, R12 is hydrogen, C1-C4alkyl or halogen and R13 is hydrogen or C2-C3alkyl or, when R10 is halogen, R13 may be methyl, R9 is hydrogen or halogen, R10 is hydrogen or halogen, and n is a number 0, 1 or 2, with the proviso that R9, R10, R11, R12,

Abstract: Disclosed herein is the use of at least one compound chosen from porphyrin compounds and phthalocyanin compounds for dyeing human keratin materials. Further, disclosed herein is a composition comprising, in a suitable dyeing medium, at least one compound from porphyrin compounds and phthalocyanin compounds as at least one direct dye, and also to a ready-to-use composition comprising this at least one direct dye. Furthermore, disclosed herein is a dyeing process using the composition or the ready-to-use composition, and also to a device for implementing this process. Finally, disclosed herein are phthalocyanin compounds.

Abstract: This invention relates to monoazo, disazo and trisazo colorants of the formula (I) where M represents two hydrogen atoms or one metal ion selected from the group consisting of Cu, Co, Ni, Mn, Zn and Al; A is the radical of a substituted naphthyl or pyrazolyl radical.

Abstract: The present invention is drawn to magenta dye blends and magenta ink-jet inks that can be used in ink sets for creating photo quality images. The dye blend can comprise a nickel-containing azo dye blended with a rhodamine dye at a 1:80 to 125:4 weight ratio.

Abstract: The present invention is drawn to dye sets for formulating ink-jet ink sets, and to specific ink sets. The dye set can comprise cyan colorant including a phthalocyanine dye; magenta colorant including a copper- or nickel-containing azo dye; and yellow colorant including at least one of Yellow 1189 dye and Yellow 104 dye yellow colorant having the structure Formula 1: wherein R1 is H, SO3M, COOM, or SO2NH2; and wherein R2 is H, SO3M, COOM, or SO2NH2; and wherein R3 is H or CH3; and wherein n and m are 2, 3, 4, 5 or 6; and wherein M is H, Na, Li, K, ammonium, ammonium substituted with alkyl or combinations thereof. Optionally, a cyan triarylmethine dye such as Acid Blue 9, or another similar cyan dye, can be blended with the phthalocyanine dye; a rhodamine dye can be blended with the copper- or nickel-containing azo dye; and/or Acid Yellow 17 or Acid Yellow 23 can be blended with Formula 1.

Abstract: Claimed are compounds of formula (I) where the substituents are each as defined in the claims, their preparation, their use as dyes and as a ingredients of an ink-jet printing ink and also substrates dyed with such compounds.

Abstract: Process for the production of dyed oxide layers on aluminum or aluminum alloys by dyeing in an aqueous dyebath, rinsing with water and sealing, in which the dyeing is carried out using at least one water-soluble anionic dye (A) which possesses at least one substituent and/or component combination with a ligand character that is capable of forming a nickel complex with nickel ions, and the sealing is carried out by cold sealing with at least one sealing agent preparation (B) containing nickel ions Ni2+ and fluoride ions F− and optionally hot secondary sealing with water, especially for achieving dyeings of improved light fastness.

Abstract: A compound which can be used as a dye and is represented by the following general formulae (I), (II) and (III). In the general formulae, A and B each independently represents a monovalent heterocyclic group bonded to an azo group by a carbon atom of the monovalent heterocyclic group; m and n each independently represents one of 0 and 1; and M represents one of a hydrogen atom and a monovalent positive ion.

Abstract: This invention relates to colorants comprising organic chromophores, in particular reactive dyes, which comprise electrophilic reactive groups, and which are also covalently bonded to fatty amine moieties through amino linking groups. Such colorants provide excellent colorability and long-term stability, both within (or on) colored substrates and upon long-term storage. Such colorants exhibit particularly good coloring and stability within hydrocarbon compositions, such as fuels, mineral oil, and the like, and wax compositions, including candles, crayons, and the like. Methods of making such colorants as well as methods of coloring hydrocarbon and wax compositions are also contemplated within this invention.

Abstract: 1:2 chromium complex dyes of the formula in which R signifies C1-9-alkyl or a radical of the formula R1 signifies C1-4-alkyl, —COOM, —COOR5 or —CONH2, R2 signifies hydrogen or —SO3M, R3 signifies hydrogen, methyl or methoxy, R4 signifies hydrogen, methyl, methoxy or chloro, n signifies from 0 to 3, M signifies hydrogen or a non-chromophoric cation and Kat+ signifies hydrogen or a non-chromophoric cation are suitable for dyeing artificially produced oxide layers on aluminium or aluminium alloys and so give highly lightfast dyeings in orange shades.

Abstract: This invention relates to colorants comprising organic chromophores, in particular reactive dyes, which comprise electrophilic reactive groups, and which are also covalently bonded to fatty amine moieties through amino linking groups. Such colorants provide excellent colorability and long-term stability, both within (or on) colored substrates and upon long-term storage. Such colorants exhibit particularly good coloring and stability within hydrocarbon compositions, such as fuels, mineral oil, and the like, and wax compositions, including candles, crayons, and the like. Methods of making such colorants as well as methods of coloring hydrocarbon and wax compositions are also contemplated within this invention.

Abstract: Process for dyeing or printing paper, films of plastic or fibre material containing hydroxyl groups or containing nitrogen with reactive dyes, which comprises using at least one reactive dye of the formula (1) from the following group a) and at least one reactive dye from the following groups b), c) and d): a) green- or blue-dyeing reactive dyes of the formula (1) b) blue-dyeing reactive dyes of the formula (2) or (3) c) red-dyeing reactive dyes of the formula (4) d) yellow- or orange-dyeing reactive dyes of the formula (5)

Abstract: A method of dyeing cellulosic fibers or fabrics using pre-metallized acid dye by pretreating the fabric with a cationic agent having a plurality of cationic centers and optionally after treating the dyed material with a cationic polymer is disclosed. The cationic polymer is desirably a polyquaternary amine material especially a poly(DADMAC) or polyvinylpyridine. Material dyed by the method has a “washed out” appearance similar to fabrics dyed using the “Jarofast” process, but the availability of a wide range of pre-metallized dyes gives a wider color range, and the method enables a wider range of substrates to be dyed successfully, including lyocell fiber materials e.g. those sold under Courtauld's trademark “Tencel” and blend/union materials with polyamides, easier processing and superior wash and light fastness.

Abstract: For dyeing (printing, for example) cellulose fibers with a reactive dye, a blue compound is greatly desired, the blue compound being capable of generating a product dyed in blue at excellent dyeing reproducibility and with good light fastness and superior fastness against chlorine water, involving less staining of white area. The invention relates to a formazan compound in a free acid form as represented by the following formula I, a dyeing method of cellulose fibers using the same and a final dyed product prepared by the method, characterized in that the compound, the method and the product are suitable so as to overcome the problem.Formula I ##STR1## (wherein R represents hydrogen, sulfo group, hydroxyl group, halogen, a C1-C4 alkyl group, a C1-C4 alkoxyl group or carboxyl group; and M represents copper or nickel.

Abstract: Mixtures of 2:1 Aluminium complexes of the type (Ic) are useful as solvent dyes.

Abstract: Compounds of formula (I) ##STR1## wherein R.sub.1 is H or SO.sub.3 M, ##STR2## M is hydrogen or a non-chromophoric cation and X.sup.+ is hydrogen or a non-chromophoric cation, are useful as dyes for oxidized aluminium substrates.

Abstract: A solid or dissolved dye mixture of azo dyes having fiber-reactive groups of the vinyl sulfone series, yielding dyeings of blue color shade, comprising one or more copper formazane dyes of the general formula (1) shown and defined in claim 1, one or more disazo dyes of the general formula (2) shown and defined in claim 1, and one or two monoazo dyes of the general formula (3) shown and defined in claim 1, respectively in the description part of the patent application, which dye mixtures are suitable for dyeing hydroxy- and/or caroboxamido groups containing materials, in particular fiber materials, such as cellulose fibers, for example cotton, wool and synthetic polyamide fibers, also together with other suitable dyes in trichromatic dyeing.

Abstract: A single bath process for exhaust dyeing polyester and cotton fiber blends by the use of a fiber reactive, vinyl sulfone dye in admixture with a disperse dye under alkaline pH conditions.

Abstract: A wood stain which is water-based, which is suitable for staining wood, and which is comprised of water; at least one dye selected from the group, consisting of azo, diazo and triarylmethane dyes; and a stabilizing agent which is effective to reduce free iron ion concentration in the stain when in contact with an autioclave composed of non-rust resistant steel during the staining process. The stabilizing agent includes at least one buffer effective to maintain the pH of the wood stain at greater than 7.0. Alternatively or additionally, the stabilizing agent includes at least one complexing agent which forms a complex with iron ions. A method for staining wood includes placing the wood into an autoclave composed of non-rust-resistant steel; submerging the wood in the wood stain; and staining the wood under pressure and temperature conditions effective therefor.

Abstract: The invention provides a process for the production of azodyes and their derivatives by diazotization and coupling reactions and optionally further modification reactions, wherein a compound of formula ##STR1## in which E signifies an aromatic bivalent radical,X.sub.1 signifies hydroxy or a primary amino group,Y.sub.1 signifies hydroxy or a primary amino groupand in whichthe aminogroup linked to the --SO.sub.2 -bound phenyl radical may optionally be acylated,or a mixture of compounds of formula (I), is employed as a coupling component or/and--in the non-acylated form--as a diazo component,the invention in particular relates also to the novel dyes and their use and to the novel intermediates.

Abstract: A process for the coloration of a substrate, especially a textile, comprising the steps of:(a) applying to the substrate a mixture comprising an aqueous solvent and a water-soluble dye comprising molecules which contain a nucleophilic group and an electrophilic group; and(b) heating or basifying or heating and basifying the dye thereby causing molecules of the dye to join together.Also claimed are dyes, polymers and oligomers.

Abstract: An improved reactive dyestuff mixture comprises at least one monochlorotriazine dyestuff 1 and at least one monofluorotriazine dyestuff 2 and/or fluorochloropyrimidine dyestuff 3, and if appropriate additional dyestuffs having the formulae given in the description.

Abstract: A reactive dyestuff mixture contains at least one vinylsulphonylphthalocyanine dyestuff, at least one Ni fluoro-chloropyrimidenyl phthalocyanine dyestuff and/or one Ni chlorotriazinyl-phthalocyanine dyestuff.

Abstract: Reactive dyestuffs of the formula ##STR1## in which X is ##STR2## and Z is a heterocyclic reactive group and the remaining groups have the meaning given in the description, are highly suitable for the dyeing and printing of hydroxyl- or amido-containing materials.

Abstract: A reactive dyestuff mixture showing improved compatibility contains at least one vinylsulphonyltriazine dyestuff 1, at least one monofluorotriazine dyestuff 2 or fluorochloropyrimidine dyestuff 3 together with, if desired, additional dyestuffs.

Abstract: A method for the exhaust dyeing of materials having hydroxy groups and materials containing carbonamide groups using a low salt content dye bath in conjunction with fiber reactive dyes exemplified by a dye of the following formula: ##STR1##

Abstract: Salts of ionic dyes with compounds which contain at least one ammonium, cycloammonium or immonium group and at least one aliphatic, cycloaliphatic or carbonyl radical-substituted aromatic group or containing a piperazine or piperidine group or a heteroaromatic group selected from those of the triazine, pyrimidine, quinazoline, quinoxaline, phthalazine or phthalimidine series or which contain at least two carboxylic acid groups, at least one amino group and at least one carboxylic acid group or at least one sulfonic acid group and one aliphatic, cycloaliphatic, monocyclic aromatic or heteroaromatic group are useful for dyeing synthetic materials, particularly synthetic polyamides in the mass. The obtained dyeings have exceptionally good wet fastness.

Abstract: A process is described for preparing the carbanion of the title as its sodium salt with quantitative yields and at a high level of purity, by a two-stage reaction between disodium-tetracyano-ethylene, Lewis acids and water. Metal complexes, prepared from said carbanion, are particularly suited for methods of using the metal complexes as dyes in industrial applications.

Abstract: Provided is a fiber reactive dye composition which can dye or print cellulose based fiber materials or materials containing the fiber materials uniformly with good build-up property and reproducibility and give dyed or printed products excellent in various fastness properties.A fiber reactive dye composition which comprises at least five reactive dyes selected from the groups of reactive dyes represented by the following formulas (I) to (VII) respectively in the form of free acid: ##STR1## wherein R.sub.1 and R.sub.2 are each hydrogen, alkyl, ureido or the like, R.sub.5 and R.sub.6 are each hydrogen, sulfo or the like, R.sub.3, R.sub.4, R.sub.7 to R.sub.13 and R.sub.15 to R.sub.18 are each hydrogen, alkyl or the like, R.sub.14 is --O-- or ##STR2## A, B, D, E, G, J and L are each phenylene or the like, X.sub.1 to X.sub.6 are each halogen, Y.sub.1 to Y.sub.7 are each --SO.sub.2 CH.dbd.CH.sub.2 or --SO.sub.2 C.sub.2 H.sub.4 Z, Z being a group capable of being split off by the action of an alkali, m.sub.1 to m.

Abstract: The invention relates to dye mixtures which contain dyes of the formulae ##STR1## and to dyes of the formula ##STR2## in which A.sub.1, A.sub.2, A.sub.3, B, B.sub.1, R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, Z.sub.1, Z.sub.2, X.sub.1, X.sub.2 and X.sub.3 are as defined in claim 1. The dyes and dye mixtures are distinguished by generally good properties and produce dyeings and prints having good wet and light fastness properties.

Abstract: Dyestuff mixtures containing one or more dyestuffs of the formula ##STR1## and one or more dyestuffs of the formula ##STR2## in which the substituents have the meanings given in the description are highly suitable for producing green cotton dyeings.

Abstract: A process for dyeing or printing cellulosic textile fibre materials by the trichromatic technique, which process comprises dyeing or printing said materials from an aqueous liquor with at least one red or reddish brown dyeing dye of formula ##STR1## and at least one yellow or orange dyeing dye of formula ##STR2## and at least one blue dyeing dye of formula ##STR3## wherein A.sub.1, A.sub.2, (B.sub.2).sub.1-3, R.sub.1, R.sub.2, R.sub.3, (R.sub.4).sub.1-2, (X).sub.1-2, (T.sub.1).sub.1-2, (T.sub.2).sub.1-2, (Y).sub.1-3 and Z in formulae (1) to (7) are as defined in claim 1.The process of this invention is suitable for dyeing or printing cellulosic fibre materials.

Abstract: A reactive dyestuff composition containing, as a dyestuff component, at least two different reactive dyestuffs which present similar color hue upon dyeing cellulose and have different reactive groups and different substantivities is disclosed. Preferably, the composition contains at least one reactive dyestuff having either a .beta.-sulfatoethyl-sulfone group or vinylsulfone group and at least one reactive dyestuff having a halogenated triazine group. The composition is suitable for dyeing cellulose fibers.

Abstract: A method for dyeing polyester-containing fibers by using a disperse dye, wherein said dyeing is conducted under an alkaline condition in an aqueous medium in the presence of at least one amino acid member selected from the group consisting of an amino acid, an amino acid derivative having at least one hydrogen atom of its amino group replaced with an organic group, and an alkali metal salt of such an amino acid or amino acid derivative, in the dyeing bath, and a dyeing assistant useful for the method.

Abstract: Novel metallized azo dyes are useful as infrared absorptive dyes in inks for ink-jet printing.

Abstract: Dyed and finished products of cellulose fiber materials superior in fastness properties are obtained without change in color shade by finishing dyed products with a fixing agent or/and a finishing agent capable of bonding with cellulose through a bridge formation, the dyed products being obtained by dyeing cellulose fiber materials with a dye represented by the following formula in the free acid form, ##STR1## wherein A is phenylene or naphthylene, B is alkyl, alkenyl, phenyl, naphthyl or heterocyclic group, Me is metal ion, X is --O-- or ##STR2## Y is alkoxy, phenoxy or amino, Z is sulfo or the like water-solubility-imparting group, m and n are each 0 or an integer of 1 to 3, provided that the sum is 1 to 3, D is phenylene or naphthylene, Q is --SO.sub.2 CH.dbd.CH.sub.2 or --SO.sub.2 CH.sub.2 CH.sub.2 L in which L is splittable group by the action of an alkali and R is hydrogen or alkyl.

Abstract: A dye mixture and a method of dyeing cellulosic fibers by use of the dye mixture, the dye mixture being capable of dyeing the cellulosic fibers favorably even in the presence of a small amount of an inorganic salt at dyeing, and being composed of a blend of a red water-soluble reactive dye to be represented by the following general formula (I) in the form of free acid, and a specific yellow and/or blue water-soluble reactive dye: ##STR1## (where: each of R.sup.1 and R.sup.2 denotes a hydrogen atom or a lower alkyl group which may contain therein a substituent; R.sup.3 represents a hydrogen atom, a lower alkyl group or a halogen atom and X designates --CH.dbd.CH.sub.2 or --C.sub.2 H.sub.4 OSO.sub.3 H).

Abstract: Complexes of the formula ##STR1## and salts thereof, whereineach of X.sub.1 and X.sub.2 is independently --NR.sub.1 R.sub.2,whereinR.sub.1 is hydrogen, C.sub.1-4 alkyl or C.sub.2-4 alkyl monosubstituted by hydroxy or C.sub.1-4 -alkoxy, andR.sub.2 is hydrogen; C.sub.1-10 alkyl; C.sub.2-8 hydroxyalkyl; C.sub.2-8 dihydroxyalkyl the hydroxy groups of which are attached to different carbon atoms; C.sub.1-6 alkyl monosubstituted by halo, cyano, --OR.sub.3, (C.sub.1-4 alkyl)carbonyl, (C.sub.1-4 -alkoxy)carbonyl, sulfo or sulfato; phenyl; phenyl substituted by 1 or 2 substituents selected from halo, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, acetamido and --SO.sub.2 --R.sub.4 ; phenyl(C.sub.1-4 alkyl); phenyl(C.sub.1-4 alkyl) the phenyl group of which is substituted by 1 or 2 substituents selected from halo, C.sub.1-4 -alkyl, C.sub.1-4 alkoxy, acetamido and --SO.sub.2 --R.sub.4 ; C.sub.5-6 cycloalkyl or C.sub.5-6 cycloalkyl substituted by 1 to 3 C.sub.1-4 alkyl groups,whereinR.sub.3 is C.sub.1-4 alkyl, C.sub.

Abstract: Water-soluble metallized disazo compounds which, in the free acid form, are represented by the following formula: ##STR1## wherein R.sub.1 and R.sub.2 stand independently for chlorine or nitro, and X stands for phenyl which may be substituted with chlorine, methyl, lower alkoxy, hydroxyl or carboxyl, for use in dyeing.

Abstract: Complexes of the formula ##STR1## wherein each R.sub.1 is independently (a) the radical of a coupling component of the active methylene non-cyclic or homocyclic series, (b) the radical of a coupling component of the heterocyclic series or (c) the radical of a coupling component of the monocyclic benzene series,with the proviso that at least one R.sub.1 is the radical of a coupling component of the active methylene non-cyclic or homocyclic series,each R.sub.2 is independently hydrogen, C.sub.1-4 alkyl or --SO.sub.2 NR.sub.4 R.sub.5,each R.sub.3 is independently hydrogen, halo, C.sub.1-4 alkyl or --SO.sub.2 NR.sub.4 R.sub.5, andeach M and M.sub.1 is independently hydrogen or a cation,wherein each R.sub.4 is independently hydrogen, C.sub.1-4 alkyl or C.sub.2-3 hydroxyalkyl, andeach R.sub.5 is independently hydrogen, C.sub.1-4 alkyl, C.sub.2-3 hydroxyalkyl, cyclohexyl, cyclohexyl substituted by methyl, phenyl or phenyl substituted by methyl, with the proviso that at least one of Ring A and R.sub.

Abstract: The present invention relates to a process for dyeing natural or synthetic polyamide fibre material from an aqueous liquor with dyes, in the presence of an alkali metal salt or an ammonium salt and in the presence of an assistant, which process comprises dyeing said fibre material with at least one sulfonated 1:1 metal complex dye or with a mixture containing at least one sulfonated 1:1 metal complex dye and at least one sulfonated metal-free dye, in the presence of 10 to 45 percent by weight of an alkali fluorosilicate or ammonium fluorosilicate or a mixture thereof, based on the amount of the 1:1 metal complex dye employed, and in the presence of an assistant at a pH value of 3 to 5.The process of the invention is suitable for dyeing natural or synthetic polyamide materials to give non-skittery and level dyeings of good fastness properties.

Abstract: Water-soluble disazo compounds conforming to the general formula (1) ##STR1## and their 1:1 copper complex compounds which possess useful fiber-reactive dye properties and are capable of dyeing carboxamido- and/or hydroxy-containing materials, in particular cellulose fibers, in fast shades; wherein:D.sup.1 and D.sup.2 are each a phenylene, which may be substituted, or a naphthylene optionally substituted by sulfo; in the case of the copper complex compounds the ortho-position in D.sup.1 or D.sup.2 or in both being substituted by an oxy group complex-bonded to the copper, or D.sup.1 is a radical of the formula (2a), (2b) or (2c) ##STR2## or D.sup.2 is a radical which is the reverse of formulas (2a), (2b) or (2c), in whichR.sup.1 and R.sup.2 are each independently of the other hydrogen, nitro, sulfo, methyl, ethyl, methoxy or ethoxy;K.sup.1 is a radical of the formula (3a), (3b) or (3c) ##STR3## and K.sup.