3,3,3,3-tetracarbonyl-2,2-dicyclohexyl-1-thia-2λ4-phospha-3-mangana-4-cyclopentene-4,5-dicarboxylicaciddimethylester 、
丁炔二酸二甲酯 以0%的产率得到3,3,3,3-tetracarbonyl-2,2-dicyclohexyl-1-thia-2λ(4)-phospha-3-mangana-4,6-cycloheptadiene-4,5,6,7-tetracarboxylic acid tetramethyl ester