Apparent carbon–carbon bond cleavage in an epoxide. 2,3,4,5,6-Hexachloro-12-oxopentacyclo[5.4.1.1.8,11.03,10.05,9]tridecane; a minor product from the acid treatment of endrin

Autor: ApSimon, John W., Yamasaki, Kazu, Fruchier, Alain, Chau, Alfred S., Huber, Carol P.
Zdroj: Canadian Journal of Chemistry; February 1982, Vol. 60 Issue: 4 p501-508, 8p
Abstrakt: The treatment of endrin(1) with sulfuric acid produces ketoendrin 2and from 6 to 8% of another product that we show to be 2,3,4,4,5,6-hexachloro-12-oxapentacyclo[5.4.1.1.8,11.03,10.05,9]tridecane 3, based initially on spectral evidence and confirmed by a single crystal X-ray diffraction study. The formation of 3involves an apparent and unusual carbon–carbon single bond cleavage in an epoxide accompanied by cycloaddition to a proximate carbon–carbon double bond. This transformation probably proceeds by the route outlined in ref. 1. Some of the observed nmr parameters of 3are discussed in the light of its structure and a comparison is made with the observed spectra for endrin (1).
Databáze: Supplemental Index