Olefinierungsreaktionen an tetracyclischen Pseudohydroxyphenalenonabkömmlingen

摘要

Reactions of symmetric resp. asymmetric ketene-derivatives with pseudophenalenones yield the symmetrically substituted pseudophenafulvenesulvenes2and6, resp. a mixture ofZ- andE-isomers3 a, 3 bor only theE-isomer4and theZ-isomer5. The steric influence of the substituents of the ketenes determine the reaction products.