1,5,6,7-Tetramethyl-4-[2-(1,5,6,7-tetramethyl-4-oxo-2-bicyclo[3.2.0]hepta-2,6-dienyl)ethyl]bicyclo[3.2.0]hepta-3,6-dien-2-one 在
copper dichloride 、
lithium diisopropyl amide 作用下,
生成 1,5,6,7-tetramethyl-4-[(E)-2-(1,5,6,7-tetramethyl-4-oxo-2-bicyclo[3.2.0]hepta-2,6-dienyl)ethenyl]bicyclo[3.2.0]hepta-3,6-dien-2-one