The Isolation of an Episelenurane from the Reaction of 4-Tolueneselenenyl Chloride with Ethylene

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Abstract
The structure of the first product from the addition of 4-tolueneselenenyl chloride to 1–90% 13C ethylene in methylene chloride or chloroform has been assigned as 1-chloro-1-(4′-tolyl)selenocyclopropane (1) on the basis of its n.m.r. and c.m.r. data. In particular the chemical shifts and 13C–77Se spin–spin coupling constants serve to distinguish it from its isomer 2-chloroethyl 4-tolyl selenide (2) which is slowly formed from 1.

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