Add time:08/06/2019 Source:sciencedirect.com
The title reaction in the absence of catalysts has been investigated both with the racemic and with the optically active cycloolefins. Both title olefins form [2 + 2] dimers of the trans double bonds with complete retention of configuration (trans-syn-trans 2 by R + S and trans-anti-trans 3 by R + R combination) and with mono-inversion (cis,trans 4, both by R + S and R + R combinations), but almost none with di-inversion (cis-syn-cis 5 and cis-anti-cis 6), together with trans-cis isomerised starting olefins.
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