Abstract: A process for preparing 1-cyclopropyl-naphthalene derivatives of Formula (1) wherein R1-R7 are independently hydrogen, alkyl, alkoxy, cycloalkyl or aryl comprising the steps of a) contacting an acid salt of a 1-naphthyl-2-aminoethylketone with a base and a first solvent to obtain a solution wherein the molar ratio of base to 1-naphthyl-2-aminoethylketone acid salt is at least 0.7, b) addition of hydrazine to obtain a 3-(1-naphthyl)-1H-pyrazoline, c) optionally adding a second solvent and/or at least partially removing the first solvent, and d) heating the reaction mixture to a temperature above 190° C. to obtain the compound of Formula (1).

Abstract: A process for preparing 1-cyclopropyl-naphthalene derivatives of Formula (1) wherein R1-R7 are independently hydrogen, alkyl, alkoxy, cycloalkyl or aryl comprising the steps of a) contacting an acid salt of a 1-naphthyl-2-aminoethylketone with a base and a first solvent to obtain a solution wherein the molar ratio of base to 1-naphthyl-2-aminoethylketone acid salt is at least 0.7, b) addition of hydrazine to obtain a 3-(1-naphthyl)-1H-pyrazoline, c) optionally adding a second solvent and/or at least partially removing the first solvent, and d) heating the reaction mixture to a temperature above 190° C. to obtain the compound of Formula (1).

Abstract: Disclosed herein are methods for synthesizing 2,4-pyrimidinediamines as well as intermediates used therein.

Abstract: Disclosed herein are methods for synthesizing 2,4-pyrimidinediamines as well as intermediates used therein.

Abstract: Disclosed herein are methods for synthesizing 2,4-pyrimidinediamines as well as intermediates used therein.

Abstract: Disclosed herein are methods for synthesizing 2,4-pyrimidinediamines as well as intermediates used therein.

Abstract: Disclosed herein are methods for synthesizing 2,4-pyrimidinediamines as well as intermediates used therein.

Abstract: An improved process for preparing L-aspartic acid by enzyme-catalyzed reaction of fumaric acid with ammonia, in which process L-aspartic acid is precipitated out by nitric acid and the resultant mother liquor is subjected to a nanofiltration.

Abstract: An improved process for preparing L-aspartic acid by enzyme-catalyzed reaction of fumaric acid with ammonia, in which, after reaction has been completed, excess ammonia is removed from the reaction mixture, L-aspartic acid is precipitated by adding acetic acid or formic acid, whereupon formic acid and acetic acid are rereleased from the mother liquor by adding fumaric acid, and the ammonia released and the liberated formic or acetic acid and the ammonium fumarate formed in the liberation are reused for subsequent cycles.

Abstract: Process for preparing glyoxylic esters or their hydrates in which a water-soluble salt of a maleic or fumaric monoester or a mixture thereof is reacted with ozone in aqueous solution at temperatures of from 0 to 50.degree. C., and the corresponding glyoxylic ester or its hydrate is isolated from the resulting reaction mixture.

Abstract: Process for the purification of o-phthalaldehyde in which an alcoholic solution containing the crude, unpurified o-phthalaldehyde is adjusted to a pH between 0 and 3 at a temperature between 0.degree. and 60.degree. C., then an alkaline solution is added, and the corresponding dialkoxyphthalan is extracted from the organic phase and purified by distillation and, when required, converted into the purified o-phthalaldehyde by hydrolysis.

Abstract: A process for preparing an aqueous o-phthalaldehyde-glutaraldehyde solution which comprises converting an acetal of the o-phthalaldehyde in a 10 to 60% strength aqueous glutaraldehyde solution into o-phthalaldehyde at room temperature up to 100.degree. C. by eliminating the corresponding alcohol, and removing the eliminated alcohol to give the aqueous o-phthalaldehyde-glutaraldehyde solution.