摘要:
A process for the production of mixtures of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanates comprising the steps ofA. reacting aniline and an O-alkyl carbamate to form N-phenylurethanes;B. isolating the N-phenylurethanes;C. condensing, in the presence of an acid, the N-phenylurethanes with formaldehyde or bifunctional compounds having the formulaX--CH.sub.2 --X in which X stands for a RO--, RS-- or ROCO radical and R denotes an alkyl radical, to form mixtures of methylene bis(phenylurethanes) and polymethylene polyphenylurethanes;D. cleaving the mixtures of methylene bis(phenylurethanes) and polymethylene polyphenylurethanes at temperatures of 175.degree. C. to 600.degree. C.; andE. isolating the mixtures of diphenylmethane diisocyanates and polyphenyl polymethylene polyisocyanate resulting from step D.
摘要:
.alpha.,.beta.-Unsaturated nitriles are prepared by reacting an aldehyde with formamide in the presence of an acid and the presence or absence of a non-aromatic solvent to give an N-alkenyl-formamide, which is then passed, in the gas phase, over a dehydration catalyst at an elevated temperature.The nitriles obtainable by the process of the invention are valuable starting materials for the preparation of dyes, crop protection agents, plasticizers and drugs.
摘要:
N-substituted carboxylic acid amides are prepared by reacting cyano compounds with olefins and water in the presence of cation exchangers containing sulfonic acid groups. The end products I are starting materials for the preparation of dyes, pesticides, emulsifiers, dispersants, stabilizers, textile auxiliaries and printing assistants.
摘要:
Mixtures of dyes of the formula ##STR1## where R is hydrogen or methyl and n is a number from 0 to 6 are exceptionally suitable--especially when used in the form of stock solution--for coloring mineral oil products.
摘要:
Alkylphenol compounds are manufactured by continuous reaction of phenolic compounds with olefins in the presence of a pulverulent polystyrenesulfonic acid exchanger suspended in the reaction mixture. The products are starting materials for the manufacture of dyes, pesticides, pharmaceuticals, emulsifiers, dispersing agents, stabilizers, antioxidants, plasticizers, corrosion inhibitors, disinfectants, seed dressings, aging inhibitors, crop protection agents and scents.
摘要:
1,3-Diamino-2,2-dimethyl-propane is prepared by reacting hydroxypivalaldehyde with ammonia and hydrogen in the presence of a nickel catalyst at from 40.degree. to 150.degree. C. and thereafter at from 220.degree. to 300.degree. C. The product is a starting material for the manufacture of dyes, crop protection agents and plastics, especially nylons and polyurethanes.
摘要:
A method of printing fibrous materials using a print paste incorporating as emulsifier a di-(.alpha.-phenylethyl)-phenol which has been first reacted with from 2 to 12 moles of propylene oxide and/or butylene oxide and then with from 14 to 30 moles of ethylene oxide.
摘要:
Anthraquinones are manufactured by cyclizing o-benzoylbenzoic acids in the presence of oxygen-containing compounds of aluminum and silicon at elevated temperatures. The products are starting materials for the manufacture of dyes.
摘要:
Hemiacetals of glyoxal monoacetals are useful as intermediates to prepare 2-substituted but-2-en-1,4-dial-4-acetals of the general formula I; ##STR1##
摘要:
Novel 2,2 -dialkylpentane-1,5-diisocyantes, 2,2-dialkylpentane-1,5-diurethanes and 2,2-dialkylpentane-1,5-dicarbamoyl chlorides of the formula ##STR1## where R.sup.1 and R.sup.2 are identical or different linear C.sub.1 -to C.sub.12 -alkyl, branched C.sub.3 - to C.sub.12 -alkyl, branched C.sub.2 - to C.sub.12 -alkenyl or branched C.sub.4 - to C.sub.12 -alkenyl,or R.sup.1 and R.sup.2 together are alkylene having from 4 to 7 carbon atoms, which is unsubstituted or substituted by from 1 to 5 C.sub.1 - to C.sub.4 -alkyl groups, and X is NCO, NH--CO.sub.2 R.sup.3, NHCO.sub.2 R.sup.4 or NHCOCl, where R.sup.3 and R.sup.4 are identical or different and are linear C.sub.1 - to C.sub.20 -alkyl, branched C.sub.3 - to C.sub.20 -alkyl or C.sub.5 - to C.sub.12 -cycloalkyl, are described.