Chemistry Letters, Vol.35, No.8, 918-919, 2006
Topochemical reaction of 7-bromoethoxycarbonyl-7-cyano-1,4-benzoquinone methide in the solid state
Topochemically controlled [2 + 2] photocycloaddition took place at the quinoid double bond of the 7-bromoethoxycarbonyl-7-cyano-1,4-benzoquinone methide (1) to afford its cyclobutane dimer.