Intramolecular Cycloadditions of Ketenes. 2. Synthesis of Crysanthenone, β-Pinene, β-cis-Bergamotene, and β-trans-Bergamotene

Article abstract of DOI:10.1021/jo00215a054

Vinylketenes prepared from geranoyl and farnesoyl chloride by treatment with triethylamine react to give bicyclo<3.1.1>heptanones which can be converted to β-pinene and the β-bergamotenes by Wolff-Kishner reduction.