Analysis demonstrates dimerisation in cis-butene, highlighting stereochemical implications in product formation.
The π ₂ + π ₂ cyclodimerisation of cis -butene is the simplest cycloaddition reaction with stereochemical implications. I here give it the same treatment as I did previously for electrocyclic pericyclic reactions. The photochemical reaction is known to give a mixture of two tetramethylcyclobutanes in the ratio of 1.3:1.0, with the all- cis isomer apparently predominating.
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Henry S. Rzepa (2011) studied this question.
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