| abstract |
'' PROCESSES FOR THE PREPARATION OF CIS-6,6-DIMETHYL-3-OXABYCLE- [3.1.0] -HEXAN-2-ONA AND A COMPOUND, AND, SULPHENIC ESTER '' A process for the preparation of cis-6 , 6-dimethyl-3-oxabicyclo- [3.1.0] -hexan-2-one comprising or: 1) reacting a sulfonic ester of ß, ß-dimethyl- <sym> - (hydroxymethyl) - <sym> -butyrolactone with a compound of formula M (C ~ 1-6 ~ alkoxide) ~ y ~ in a suitable solvent; or 2) reacting a C-1-4 ~ alkyl ester of 4,5-epoxy-3,3-dimethyl-pentanoic acid with M (C ~ 1-6 ~ alkoxide) ~ y ~ in a suitable solvent; where M is a suitable cation and y satisfies valence conditions. |