C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/488
C07C 69/716 (2006.01)
Patent
CA 1148563
PROCESS FOR THE PREPARATION OF THE METHYL ESTER OF 4-OXOPENTANE-1-CARBOXYLIC ACID ABSTRACT OF THE DISCLOSURE An improved process for the preparation of the methyl ester of 4-oxopentane-1-carboxylic acid by the reaction of acetone with methyl acrylate. The reactants are reacted in a reaction zone in the presence of both a primary amine and/or Schiff base as a catalyst, and an acid compound to form a reaction mixture containing the methyl ester. The reaction mixture is distilled to form a distillate containing unconsumed reactants and catalyst and a residual liquid phase containing the methyl ester. The distillate is recycled to the reaction zone, and the methyl ester is recovered from the residual liquid phase by a further distillation. The amount of oxygen dissolved in the reaction mixture is maintained at a level below 20 parts by weight per million, and the distillation of the reaction mixture is carried out at a temperature of less than 195°C, at a pressure of at least atmospheric, and in the presence of an inert solvent having a boiling point of between 80 and 195°C.
320352
Balg Theodorus
Cramers Constant M.a.
Fetherstonhaugh & Co.
Stamicarbon B.v.
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