All articles of this category The title compound was prepared in two steps by [2 + 2] photochemical cycloaddition between ( E )-1,2-dichloroethene and maleic anhydride followed by reductive chlorine elimination with activated zinc. This safe synthetic route gave cis -cyclobut-3-ene-1,2-dicarboxylic anhydride in good overall yield and could be carried out on a multigram scale. cyclobutenes - photochemistry - [2 + 2] cycloaddition - reduction - activated zinc
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Gauvry et al. (1999) studied this question.