By Dehydration Or Dealcoholization Patents (Class 560/212)
  • Process for producing .alpha.,.beta.-unsaturated carboxylic acids or esters thereof
    Patent number: 4464539
    Abstract: A process for producing an .alpha.,.beta.-unsaturated carboxylic acid or esters thereof which comprises bringing an .alpha.-hydroxycarboxylic acid amide into contact with a solid acid catalyst independently or along with water, or along with water and an aliphatic alcohol, or along with an aliphatic alcohol.
    Type: Grant
    Filed: April 6, 1983
    Date of Patent: August 7, 1984
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Masao Hashimoto, Tadatoshi Honda
  • Process for producing sorbic acid or its derivatives
    Patent number: 4296243
    Abstract: A process for producing sorbic acid and its derivatives, which comprises reacting crotonaldehyde with ketene in the presence of a catalyst and decomposing or hydrolyzing the resulting adduct, said catalyst comprising a zinc salt of an aliphatic carboxylic acid and a phosphine or a pyridine.
    Type: Grant
    Filed: July 27, 1979
    Date of Patent: October 20, 1981
    Assignee: Daicel Ltd.
    Inventor: Kazuo Sato
  • Manufacture of olefinically unsaturated esters
    Patent number: 4056545
    Abstract: A process for the manufacture of .alpha.,.beta.,.gamma.,.delta.-unsaturated esters containing a very high proportion of the 4(Z)-isomer, which are valuable perfume and flavor materials. The .alpha.,.beta.,.gamma.,.delta.-unsaturated esters are manufactured by a Wittig synthesis from phosphoranes and fumaraldehyde-acid esters under specific conditions.
    Type: Grant
    Filed: July 14, 1976
    Date of Patent: November 1, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Werner Hoffmann, Manfred Baumann
  • Method of making carboxylic acid esters
    Patent number: 4055590
    Abstract: In a method for making a carboxylic acid ester by the reaction of the corresponding carboxylic acid amide with a primary alcohol in the presence of a catalyst at elevated temperature, the improvement wherein said catalyst is an at least partially dissolved metal carboxylate or a compound forming a metal carboxylate by reaction in situ with a carboxylic acid, the anion of which metal carboxylate is the anion of said carboxylic acid.
    Type: Grant
    Filed: June 22, 1976
    Date of Patent: October 25, 1977
    Assignee: Rohm GmbH
    Inventors: Wilhelm Gruber, Guenter Schroeder