Boron trifluoride etherate → (E)-1-(2,6,6-trimethylcyclohex-2-en-1-yl)but-2-en-1-one

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Reaction Steps

A mixture of 10 g. of 6,10-dimethyl-4-oxo-2,5,9-undecatrien prepared according to the method of paragraph c herebelow, 100 ml. of benzene and 1 g. of boron trifluoride etherate was heated to the reflux until the vapour phase chromatographic analysis of a sample showed that practically all the starting material had disappeared. The solution was cooled and stirred with ice-water. The organic layer was removed and treated as usual. Distillation of the residue of evaporation gave a 50 % yield of trans-2,6,6-trimethyl-1-crotonoyl-2-cyclohexene of about 60 % purity as shown by the vapour phase chromatographic analysis.

Provenance & Evidence