Preparation of gamma, delta -unsaturated ketones by carroll reaction in cyclic carbonates or gamma -lactones as solvents

Preparation of gamma , delta -unsaturated ketones (III) comprises: (a) reaction of vinyl carbinols or propargyl alcohols with acetoacetic acid alkyl esters or diketenes; and (b) thermal rearrangement of the resultant acetoacetate optionally in the presence of an aluminium catalyst to give (III) via...

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Bibliographic Details
Main Authors DIETMAR WELLER, HEINZ ETZRODT, MANFRED STROEZEL
Format Patent
LanguageEnglish
Published 10.06.1998
Edition6
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Summary:Preparation of gamma , delta -unsaturated ketones (III) comprises: (a) reaction of vinyl carbinols or propargyl alcohols with acetoacetic acid alkyl esters or diketenes; and (b) thermal rearrangement of the resultant acetoacetate optionally in the presence of an aluminium catalyst to give (III) via the Carroll reaction. Reaction step (a) or (b) is conducted with a cyclic carbonate of formula (I) or gamma -lactone of formula (II) as solvent: R -R =H, Me, or Et; and R = H, Me, Et, i-Pr, phenyl or methoxymethyl.
Bibliography:Application Number: CN19971014168