Abstract: Process for preparing 8,2'-O-anhydropurine nucleosides having a utility as intermediates for antiviral and anticarcinogenic drugs which comprises heating 2',3'-O-sulfinyl-8-oxypurine nucleosides in an aprotic polar solvent in the presence of an alkali metal, alkaline earth metal or ammonium salt of an inorganic or organic weak acid.

Abstract: In the process for preparing an organic compound of the formulaA' -- Xin whichX is an amino group, a hydroxyl group or a carboxyl group, andA' is the remainder of the molecule, from an organic compound of the formulaA -- Xin whichA is the remainder of the molecule which can undergo reaction to form A', by converting A -- X into a compound of the formulaA -- Z -- COORin whichZ is --NH--, --O-- or a direct C--C bond, andR is a radical of the formula ##STR1## IN WHICH Y is a direct C--C single bond, the --CH.dbd.CH-- group or an arylene group,R.sup.1 to R.sup.4 each independently is hydrogen, halogen or an alkyl, aryl, aralkyl, alkoxycarbonyl, alkylaminocarbonyl, arylaminocarbonyl or cycloalkylaminocarbonyl radical, orR.sup.1 + r.sup.2 and R.sup.3 + R.sup.4 each independently completes a 5- or 6-membered carbocyclic ring, orR.sup.1 and R.sup.

Abstract: The present invention relates to an improved continuous process for the preparation of mononitro-aromatic compounds which comprises (1) nitrating a reactive aromatic compound in the absence of sulphuric acid until mono-nitration is essentially complete, said nitration being carried out in 40 to 68% strength by weight nitric acid, (2) separating mechanically the nitration reaction mixture into an inorganic phase and an organic phase, (3) washing of the organic phase with water and dilute alkali solution and subsequent separation of the unconverted starting material end of the adhering water by means of rectification (4) feeding the inorganic phase and, if necessary, the wash water of the first water wash of the organic phase, to a rectification column in which (a) water is withdrawn over the top (b) optionally a fraction which has a lower nitric acid content than the feed is withdrawn from a sidestream takeoff in the rectifying section of the column and (c) a fraction which has a higher nitric acid content tha

Abstract: In the production of an FeOOH seed suspension, comprising contacting an iron(II) salt solution with a basic precipitant to form a basic iron(II) salt or hydroxide suspension, oxidizing the salt or hydroxide, the precipitation and oxidation steps being carried out locally separate from one another and recovering a suspension of FeOOH, the improvement which comprises(a) effecting the precipitation by mixing an about 1 to 20% by weight iron(II) salt solution with sufficient basic precipitant to precipitate about 25 to 95 atom % of the iron(II),(b) at another location oxidizing 10 to 50% of the iron(II) precipitated in (a) over a period of from about 0.5 to 5 hours at a temperature in the range from about 20.degree. C to 65.degree. C,(c) at another location oxidizing the suspension obtained in (b) with intensive mixing over a period of from about 0.

Abstract: A process for regenerating a deactivated oxidation catalyst, especially one containing vanadium oxide, wherein the deactivated catalyst is treated with an aqueous solution of ammonia and/or an amine at an elevated temperature so as to dissolve at least a portion of the catalyst and the resultant solution or suspension is treated in a known manner to obtain the reactivated catalyst.

Abstract: Brominated dibenzofuran of the formula ##STR1## WHEREIN X + Y = 6.0 TO 7.0 AND Y = 0 TO 0.3. The brominated dibenzofuran can be prepared by reaction of bromine and dibenzofuran at 0.degree. and 150.degree. C in the presence of halogenation catalyst. The products are useful as flameproofing agents for organic polymers, e.g. polyethylene.

Abstract: To recover amino acids from raw sugar juice, as obtained in beet extraction, the juice is treated with acid or with lime to coagulate impurities which are separated off. The juice may be treated before or after coagulation with a pectin-cleaving enzyme. The juice so pretreated can be directly passed through a strong cation exchanger and a weak anion exchanger whereby the amino acids are adsorbed. Switchover to a new cation exchanger is initiated when betaine flows out the column. Elution is effected, preferably with an ammonium compound, and eluate is collected, preferably each fraction being enriched in a different amino acid. The sugar juice may be concentrated and crystallized in known manner and is of comparatively high purity.

Abstract: Catalysts for the catalytic oxidation of organic compounds containing silicon, vanadium, sulfur, oxygen and at least one alkali metal element. The catalyst is prepared from a silicic acid which has an average particle size of less than 50 microns and an alkali metal content of less than 2% by weight, calculated as Na.sub.2 O and expressed relative to anhydrous silicic acid.

Abstract: Elastic, temporarily adhesive polyurethanes are produced by reaction of a polyol having a molecular weight in excess of about 500, a diisocyanate and a chain lengthener, the diisocyanate being present in about 0.4 to 1.4 times the weight of the polyol and in about 3.5 to 12.5 times the molar amount of the polyol, the chain lengthener having active hydrogen atoms and being present in about 3 to 12 times the molar amount of the polyol, the chain lengthener having a molecular weight of less than about 300, more than about 50 mole % of each of the polyol and diisocyanate units and up to about 50 mole % of the chain lengthener units comprising linear aliphatic C.sub.6 units.

Abstract: O,O-Di-alkyl-O-(1-6-pyridazinon-3-yl)-(thiono)-phosphoric acid esters of the formula ##STR1## in which R is methyl or ethyl,R.sub.1 is alkyl with 3 to 5 carbon atoms or alkoxyalkyl with 1 to 3 carbon atoms in each alkoxy and alkyl moiety,R.sub.2 is hydrogen, nitro, halogen or alkyl with 1 to 6 carbon atoms, andX is oxygen or sulfur,Which possess insecticidal and acaricidal properties.

Abstract: A printing paste for marking non-weldable areas in the manufacture of ducted plates. The paste is composed of approximately equal parts by weight of(A) a dispersion comprising about 5 to 60% by weight of titanium dioxide, about 0.10 to 4% by weight of magnesium montmorillonite, up to about 10% by weight of silica and the balance of water, and(B) a dispersion comprising about 25 to 35 parts by weight of alginate, about 50 to 70 parts by weight of chemically pure silica having a submicroscopic particle size, 2 to 4 parts by weight of highly concentrated ammonia solution, and about 1000 parts by weight of water.

Abstract: Process for hardening liquid resols comprising using for the hardening, strong acids which if they are solid at room temperature are used in the form of their mixtures with inert finely divided solid diluents or if they are liquid or gaseous at room temperature adsorbed onto an adsorbing agent.

Abstract: An oxygen generator for welding, cutting and brazing work includes a gas-tight container and a cartridge holder for cartridges giving off oxygen when burned. The gas-tight container is constructed as a pressure tank and envelops the cartridge holder in such a way so as to leave a storage volume which is capable of accommodating the amount of oxygen given off by burning at least one cartridge without exceeding the pressure limits of the pressure tank.

Abstract: Novel derivatives with immunological activity are obtained by reacting a hydrosoluble extract of mycobacteria with an aliphatic acid derivative containing 10 to 18 carbon atoms and isolating the resulting product. The hydrosoluble extract of mycobacteria is a tetrasaccharide-heptapeptide or its dimer, trimer or tetramer possibly associated with non-amino reducing sugars. The derivative has the formula: ##STR1## IN WHICH M IS A WHOLE NUMBER COMPRISED BETWEEN 1 AND 4 INCLUSIVE, N IS A WHOLE NUMBER AT LEAST EQUAL TO 1 AND R is an alkyl radical containing 9 to 17 carbon atoms.

Abstract: Organophosphoric acid ester anhydrides of the formula ##STR1## in which R.sup.1 is alkyl with 1-6 carbon atoms, andR.sup.2 is alkoxy, alkylthio, alkylamino or dialkylaminoWhich possess arthropodicidal and nematicidal properties.

Abstract: Improvement in a method for the fractionation and separation of proteins by dsorption on an organic gel and elution with a descending ammonium sulfate gradient, the improvement comprising treating a solution of the proteins with ammonium sulfate down to a concentration which is from 5 to 15% below the concentration normally required for protein precipitation, mixing the solution obtained with unsubstituted agarose gel, whereby the protein is precipitated onto the agarose gel, and then fractionally eluting the latter, preferably with a linearly descending gradient.

Abstract: The invention concerns a germ-inhibiting, microbicidal or deodorizing composition comprising p-isopropyl- and/or p-tert.butyl-.alpha.-methyl hydrocinnamic alcohol, together with a carrier or diluent.

Abstract: A puncture-proof tubeless tire having an additional reinforcing rubber layer provided on the inside of a cord layer of the tire at a region corresponding at least to a crown and shoulders of the tire. The thickness of the reinforcing rubber layer at a region corresponding to the crown and shoulders is advantageously within the range of a 0.4 to 4 times that of an outer rubber layer of the region corresponding to the crown and shoulders excluding the thickness of patterned projections. A lining agent comprising a mixture of an adhesive and diethylene glycol and rubber particles dispersed therein may advantageously be employed in the tire as mentioned above not only to further ensure the puncture-proof character of the tire but also to suppress an excessive temperature rise of the tire, avoiding deterioration of the tire by heat.

Abstract: A process for the manufacture of a molded article from a powder form of a polyolefin of molecular weight of at least one million which comprises introducing a homopolymer of ethylene or a copolymer of ethylene with an .alpha.-olefin of 3 to 10 carbon atoms having a molecular weight of at least one million into a mold loosely closed with a plug, heating the same in said mold in an inert atmosphere at a temperature of 150.degree. to 250.degree. C, whereby said polyolefin is transformed into a rubbery elastic state, thereafter compressing said polyolefin in said mold for at least two minutes at a pressure of 2.5 to 25 N/mm.sup.2 and thereafter compressing said polyolefin for at least one minute at a pressure of 40 to 100 N/mm.sup.2.

Abstract: Aluminum is continuously anodized using direct current in an anodizing cell having a cathode connected to the source of direct current which is succeeded by a cathodic contact cell having an anode connected to the same source of direct current. The anodizing direct current is introduced into the aluminum in the contact cell, the aluminum having an anodized oxide coating formed thereon in the anodizing cell before entering the contact cell.