Photochemical transformations of small ring compounds. 116. Photochemistry of cyclopropene derivatives. Synthesis of the tricyclo[2.2.0.02,6]hexane ring system via a photosensitized [2 + 2] cycloaddition reaction
Preparation of cyclopentadienes and diazocyclopentadienesvia cyclopentenolones and cyclopentenones
作者:B.H. Freeman、J.M.F. Gagan、D. Lloyd
DOI:10.1016/0040-4020(73)80276-5
日期:1973.12
The structure and stereochemistry of the cyclopentenolones obtained by condensation of dialkyl ketones with benzil have been studied by NMR spectroscopy. These enolones were converted into cyclopentenones and cyclopentadienes. Alkyl-substituted cyclopentadienes required phenyllithium to effect their conversion by toluenesulphonyl azide into diazo-cyclopentadienes; otherwise piperidine sufficed as base