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1-Cyclobutene-1,2-dicarboxylic acid synthesis

5synthesis methods
-

Yield:-

Steps:

Multi-step reaction with 2 steps
1: (i) PCl5, CCl4, CHCl3, (ii) Et3N, benzene
2: aq. H2SO4 / dioxane

References:

Bellus;Von Bredow;Sauter;Weis [Helvetica Chimica Acta,1973,vol. 56,# 8,p. 3004 - 3038]