Abstract: Finely particulate cellulose esters of aromatic or aromatic-aliphatic carboxylic acids in the form of substantially spherical, partially crystalline particles having an average diameter of 1 to 200 .mu.m and a specific surface area of 10 to 300 m.sup.2 /g, are suitable for use as stationary phase in methods of chromatographic separation, especially for the resolution of racemates.

Abstract: Compounds of the formula I ##STR1## in which Me is Ti, Zr or Hf, R.sub.1 is a group transferable to aldehyde, keto or imine groups, for example methyl, allyl, vinyl or the radical of an enol or enamine, R.sub.2 is, for example, cyclopentadienyl, R.sub.3 and R.sub.4 are, for example, H or alkyl, R.sub.5 is, for example, phenyl and the C(1) and C(2) atoms are chiral and have predominantly one configuration, are suitable for use as chiral reactants for aldehydes, ketones and imines for the preparation of both enantiomers of secondary or tertiary alcohols or tertiary amines.

Abstract: The invention relates to the stabilization of organic polymers against degradation by light by the addition of (a) a light stabilizer of the formula ##STR1## in which R is hydrogen or methyl and A is an alkylene radical, and (b) an oxide, hydroxide, carboxylate, enolate or phenate of magnesium or zinc.

Abstract: The present invention provides lubricant compositions comprising a lubricant base and, as metal deactivator and/or antioxidant, at least one compound having the formula (I): ##STR1## wherein R.sub.2 is C.sub.1 -C.sub.12 straight or branched chain alkyl; andR.sub.3 is C.sub.1 -C.sub.12 straight or branched chain alkyl interrupted by one or more O-atoms or R.sub.3 is C.sub.5 -C.sub.12 cycloalkyl.

Abstract: Monolayer or multilayer systems containing a 1,5-diarylpenta-1,4-dien-3-one-palladium(O) complex of formula I ##STR1## wherein both the groups R.sup.1 independently of the other are hydrogen or C.sub.1 -C.sub.4 alkyl or both the groups R.sup.1 together are a polymethylene chain containing 2-4 C atoms, R.sup.2 is hydrogen, C.sub.1 -C.sub.22 alkyl, --N(R.sup.4).sub.2, --NO.sub.2 or --CN, R.sup.3 is C.sub.1 -C.sub.22 alkyl, R.sup.4 is C.sub.1 -C.sub.22 alkyl, k=1-3.5, m=1-3 and p=1-3, are excellently suitable for electroless metallization, as sensors for H.sub.2 detection or as catalytically active surfaces for hydrogenation processes.

Abstract: Curable mixtures comprisinga) at least one epoxy resin containing on average more than one 1,2-epoxy group per molecule,b) at least one cyclic carboxylic anhydride,c) an adduct of a zinc salt of a C.sub.6 -C.sub.18 carboxylic acid with a tertiary amine, andd) optionally a filler and/or further conventional modifiers have a long pot life without impairment of the brief curing time at elevated temperatures.

Abstract: Process for the preparation of finely divided porous cellulose in the form of essentially spherical particles by formation of a suspension, in which an organic solution of a cellulose ester of aromatic or aromatic-aliphatic carboxylic acids containing a C.sub.5 -C.sub.12 alkanol is stirred into an aqueous solution of an anionic surfactant, the solvent is removed and the particles are isolated and hydrolyzed under heterogeneous conditions. They are suitable as adsorbents in e.g. chromatographic processes.

Abstract: Organometal-containing polymers having side chains of the formula I ##STR1## in which, for example, M is Si, X is O, R.sup.1 and R.sup.2 are hydrogen and R.sup.4 to R.sup.6 are each methyl and which have an average molecular weight between 1,000 and 1,000,000, are suitable for the preparation of dry-developable photoresists, such as are required for the generation of structured images, in particular in microelectronics.

Abstract: Lubricants are stablized against oxidative degradation by the incorporation therein of hydroxylamines substituted with thioalkanoic acid residues of the formula ##STR1## wherein R and R.sub.1 are independently H, alkyl or aryl, X is independently OR.sub.2 SR.sub.2 or NR.sub.3 R.sub.4 wherein Rhd 2 is H, alkyl, cycloalkyl or aralkyl, and R.sub.3 and R.sub.4 are independently H, alkyl or aryl and n is 1 or 2.

Abstract: Dihalobutyraldehydes of formula I ##STR1## wherein X and Y are each independently of the other Cl or Br, are obtainable at high rates of conversion and with excellent selectivities by catalytic dehalogenation with hydrogen by carrying out the reaction with appropriate .alpha.,.alpha.-dihalobutyraldehydes in an organic aprotic solvent. The dihalobutyraldehydes are intermediates for the synthesis of herbicidal acyl cyclohexanediones.

Abstract: The present invention provides a composition in contact with a corrodable metal surface, comprising a functional fluid and, as corrosion inhibitor, a compound having the formula I: ##STR1## as well as salts or esters thereof, wherein R.sup.1 is C.sub.4 -C.sub.20 linear or branched alkyl, phenyl or C.sub.7 -C.sub.20 alkylphenyl;R.sup.2 is C.sub.1 -C.sub.12 linear or branched alkyl, phenyl or C.sub.7 -C.sub.20 alkylphenyl, or arylalkyl containing 7-20 carbon atoms;X is CH.sub.2, O or S;Y is O or S; andZ is --(CH.sub.2).sub.n -- in which n is 1, 2, 3, 4 or 5, or Z is --CH.sub.2 --CH(CH.sub.3)--.Some of the compounds of formula I are new.

Abstract: .alpha.-Pyrones of the formula I ##STR1## in which R.sup.1 is --CF.sub.3 or --COOR.sup.3 and R.sup.3 is the radical of a C.sub.1 -C.sub.18 alcohol diminished by a hydroxyl group, and R.sup.2 is --F, --Br, --Cl, --CN, --CF.sub.3, C.sub.1 -C.sub.18 alkyl, C.sub.2 -C.sub.18 alkenyl, C.sub.2 -C.sub.18 alkynyl, C.sub.1 -C.sub.18 alkoxy, C.sub.1 -C.sub.18 alkylthio, C.sub.1 -C.sub.18 alkylsulfonyl, C.sub.6 -C.sub.16 aryl, C.sub.7 -C.sub.24 alkaryl, C.sub.7 -C.sub.12 aralkyl, C.sub.8 -C.sub.24 alkaralkyl, C.sub.6 -C.sub.16 aryloxy, C.sub.6 -C.sub.16 arylthio, C.sub.6 -C.sub.16 arylsulfonyl, C.sub.7 -C.sub.24 alkaryloxy, C.sub.7 -C.sub.24 alkarylthio, C.sub.7 -C.sub.24 alkarylsulfonyl, C.sub.7 -C.sub.12 aralkyloxy, C.sub.7 -C.sub.12 aralkylthio, C.sub.7 -C.sub.12 aralkylsulfonyl, C.sub.8 -C.sub.24 alkaralyloxy, C.sub.8 -C.sub.24 alkaralylthio, C.sub.8 -C.sub.24 alkaralylsulfonyl, secondary amine having 2 to 24 C atoms or trialkylsilyl or trialkoxysilyl each of which has 3 to 18 C atoms.

Abstract: Asymmetric hydrogenation of prochiral N-aliphatic ketimines to give optically active secondary amines at a temperature from -20.degree. to 80.degree. C., a hydrogen pressure of 10.sup.5 to 10.sup.7 Pa, with the addition of catalytic amounts of an iridium compound of the formula III or IIIa[XIrYZ] (III)or[XIrY].sup..sym. A.sup..crclbar. (IIIa)in which X is two olefin ligands or a diene ligand, Y is a chiral diphosphine the secondary phosphine group of which are attached through 2-4 C atoms and which, together with the Ir atom, forms a 5-membered, 6-membered or 7-membered ring, or Y is a chiral diphosphinite the phosphinite groups of which are attached via 2 C atoms and which, together with the Ir atom, forms a 7-membered ring, Z is Cl, Br or I and A.sup.- is the anion of an oxygen acid or complex acid, and, if appropriate, with the addition of an ammonium chloride, bromide or iodide or an alkali metal chloride, bromide or iodide.

Abstract: A process for the preparation of lead molybdate pigments containing lead chromate, lead sulfate and lead molybdate, which comprises preparing the lead molybdate pigments by reacting an aqueous solution of a lead salt with an aqueous solution containing chromate, molybdate and sulfate salts or with an aqueous solution of each of said salts using 2 to 5 mol % of lead molybdate seed crystals, based on the total molar amount of lead chromate, lead sulfate and lead molybdate. The lead molybdate pigments so obtained are strong and are highly suitable for coloring organic materials of high molecular weight.

Abstract: The invention relates to .alpha.-pyrones of formula I ##STR1## wherein R.sup.1 is chloro or bromo and R.sup.2 is hydrogen, chloro or bromo. The halogen in 4-position can be replaced, for example, by alkoxy, alkylthio or secondary amino. The .alpha.-pyrones are suitable diene components for Diels-Alder reactions.

Abstract: Compositions containing a lubricant, a hydraulic fluid or a metal-working fluid and at least one compound of the formula I ##STR1## in which R, R.sup.4, R.sup.5 and n are as defined in claim 1, are described. The compounds of the formula I are suitable for use as anti-wear agents and as extreme-pressure additives for lubricants, hydraulic fluids and metal-working fluids. Novel compounds of the formula I are also described.

Abstract: Compounds of formula I ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are H, alkyl or aryl, m and n are 0 or 1, and A is a divalent organic radical which, with (CR.sup.1 R.sup.2).sub.m NF--SO.sub.2 (CR.sup.3 R.sup.4).sub.n groups, forms a 5- to 8-membered ring, are admirably suitable fluorinating agents for fluorinating carbon atoms, especially as stereospecific fluorinating agents, when the compounds contain a chiral carbon atom and are in optically active form. The compounds of formula I are prepared by reacting the corresponding silated sulfonamides, wherein the NF group is replaced by an N-SiR.sup.7 R.sup.8 R.sup.9 group and R.sup.7, R.sup.8 R.sup.9 are each independently C.sub.1 -C.sub.12 alkyl, cyclopentyl, cyclohexyl, benzyl or phenyl, with a fluorinating agent.

Abstract: A process for the formation of an image comprises(i) electrodepositing on a conductive surface a layer of a quinone diazide positive photoresist,(ii) subjecting the layer to radiation in a predetermined pattern,(iii) heating the layer such that areas thereof exposed in stage (ii) are rendered insoluble in an aqueous base developer,(iv) subjecting the layer to radiation such that the areas not exposed in stage (ii) are rendered more soluble in an aqueous base developer than the areas rendered insoluble in stage (iii) and(v) removing the areas not exposed in stage (ii) by treatment with an aqueous base developer.The process is useful in the production of printing plates and printed circuits.

Abstract: Optically active iridium complex of the formula I ##STR1## in which the >CH--CH< group contains at least one chiral C atom, R.sup.1 and R.sup.2 together are unsubstituted or C.sub.1 -C.sub.4 -alkyl substituted --(CH.sub.2).sub.4 -- or R.sup.1 is alkyl, unsubstituted or C.sub.1 -C.sub.4 -alkyl substituted, cycloalkyl, aryl, or aralkyl or alkaralkyl and R.sup.2 is H, X.sup.- is the anion of a monobasic inorganic or organic acid, and Y and Z are each ethylene or Y and Z together are an acyclic or cyclic diene having 6 to 10 c atoms whose diene groups are bonded via 1 or 2 C atoms, are suitable for use as enantioselective homogeneous catalysts.

Abstract: The preparation of abrasives, especially abrasive papers and abrasive fabrics, is improved by using an epoxy resin in conjunction with a cationic photoinitiator as binder for the abrasive particles. The binder is cured by irradiation with shortwave light and subsequent heating. The process is distinguished by low curing temperatures and brief curing times.