(3aR,6aR)-2,5-Dihydroxy-1,3a,4,6a-tetrahydro-pentalene-1,3,4,6-tetracarboxylic acid tetra-tert-butyl ester 在
potassium hydride 作用下,
生成
(3aS,6aS)-1,4-Diallyl-2,5-dimethoxy-1,3a,4,6a-tetrahydro-pentalene-1,3,4,6-tetracarboxylic acid tetra-tert-butyl ester