作者:Kunio Sugiyama、Masato Yoshida、Takashi Tsuno                                    
                                    
                                        DOI:10.3987/com-94-6778
                                    
                                    
                                        日期:——
                                    
                                    The photolyses of the gamma-allenyl-substituted conjugated alkylidenecycloalkanones underwent the intramolecular oxa-Diels-Alder reaction and the E-Z geometrical isomerization, and for the cyclopentanone possessing a 3-methyl-1,2-butadienyl group, the intramolecular [2+2] cycloaddition also occurred. The oxa-Diels-Alder reaction takes place via photochemical process of the Z-enones.