(E)-dimethyl 2-(4-benzylideneoctyl)malonate                                                                                                                                                              在
                                                                                                                                                                                 
manganese(III) triacetate dihydrate   、                                                                                                  copper(II) bis(trifluoromethanesulfonate)                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙腈                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 methyl 6a-butyl-3-oxo-1-phenylhexahydro-1H-cyclopenta[c]furan-3a-carboxylate   、                                                                                             methyl 6a-butyl-3-oxo-1-phenylhexahydro-1H-cyclopenta[c]furan-3a-carboxylate