作者:D Becker、N Haddad                                    
                                    
                                        DOI:10.1016/s0040-4039(00)87817-x
                                    
                                    
                                        日期:1986.1
                                    
                                    The stereoselectivity in [2+2] photocycloaddition was studied on System I. Compounds , , and cyclize in high yield and the selectivity is higher than 94%.
                                    在[2 + 2]光环立体选择性进行了研究上系统一化合物,和环化以高收率和选择性大于94%以上。