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Relief of strain is the driving force for the [2 + 2] cycloaddition and subsequent [2 + 2] cycloreversion of 1 with both open-chain and cyclic alkenes. The metathesis can even be performed with benzene as the olefin component [Eq. (a)]. The product can be roughly described as a ribbon- or beltlike conjugated system.
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Kammermeier et al. (1996) studied this question.
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