Benzenesulfanyl chloride

Benzenesulfanyl chloride adds across one of the cyclopropane bonds of dimethyl tetracyclo-[3.2.0.0 . 0" ]heptane-l,5-dicarboxylate (14, = Me) to produce a 50 50 mixture of... 

In an alternative type of diene forming reaction, the cyclopropene 4 is converted into 5 by reaction with benzenesulfanyl chloride, possibly by trapping of an intermediate vinylcarbene. ... 

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