4,4-Dimethyl tetrahydro-2H-pyran-2-on derivatives, process for their preparation and their use for the preparation of cyclopropanic derivatives.

摘要

1. In all their possible isomeric forms, the compounds with the formula 1 : see diagramm : EP0153212,P12,F1 in which X represents a nucleofige group chosen from the group constituted by halogen atoms, the radicals : see diagramm : EP0153212,P12,F1 in which R' represents an alkyl radical containing from 1 to 18 carbon atoms or R' représents an aryl radical containing from 6 to 14 carbon atoms and the radicals : see diagramm : EP0153212,P12,F1 in which R2 and R3 , identical or different, represent an alkyl radical contraining from 1 to 18 carbon atoms or an aryl radical containing from 6 to 14 carbon atoms and R represents a hydrogen atom or the carbonated residue of a chiral or non-chiral alcohol ROH, as well as all the possible mixtures of these isomers.