C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
C07F 9/655 (2006.01) C07D 319/06 (2006.01)
Patent
CA 2100123
Abstract of the Disclosure: An improved process for preparing cyclic acetals of 3-formyl-2-butenyltri- phenylphosphonium chloride by acetalization of 3-formyl- 2-butenyl acetate with an aliphatic 1,3-diol, conversion of the resulting 4-acetoxy acetal into the corresponding 4-hydroxy acetal, Vilsmeier chlorination to give the corresponding 4-chloro acetal and subsequent reaction with triphenylphosphine entails carrying out the first 3 steps in an aliphatic or cycloaliphatic hydrocarbon or mixture of hydrocarbons with 6-8 carbons and the reaction with triphenylphosphine in an alkanol with 1-3 carbons and/or in aliphatic or cycloaliphatic hydrocarbon with 6-8 carbons or a corresponding mixture of hydrocarbons. The process is particularly advantageous when conversion of the 4-acetoxy acetal into the 4-hydroxy acetal is carried out with an aqueous alkali metal hydroxide solution in the presence of phase-transfer catalysts, and the first three, or all four, reaction stages are carried out in the same C6-C8-hydrocarbon.
Dobler Walter
Jaedicke Hagen
Krause Wolfgang
Paust Joachim
Basf Aktiengesellschaft
Dobler Walter
Jaedicke Hagen
Krause Wolfgang
Paust Joachim
LandOfFree
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