作者:Iwao Tabushi、Hidenori Yamada、Zenichi Yoshida、Ryohei Oda
DOI:10.1246/bcsj.50.285
日期:1977.1
The reactions of benzyne with substituted benzenes (anisole, chlorobenzene, methyl benzoate, benzylidyne trifluoride and toluene) giving the Diels-Alder adducts were investigated, where two positionally isomeric adducts were possible, i.e., a geminal-para adduct (1,4-adduct with respect to the substituent) and an ortho-meta adduct (2,5-adduct). From the competition reactions, relative reactivities
研究了苄与取代苯(苯甲醚、氯苯、苯甲酸甲酯、三氟化苄基炔和甲苯)产生 Diels-Alder 加合物的反应,其中两种位置异构加合物是可能的,即双对位加合物(1,4-加合物)关于取代基)和邻位间位加合物(2,5-加合物)。从竞争反应中,估计了 1,4-加成和 2,5-加成的苯与取代苯的相对反应性。观察到明显不同的取代效应。对于 1,4-加成,观察到较大的负 ρ 值 (-1.79),但对于 2,5-加成,取代基效应很小。从苄基和甲苯,邻苄基联苯 (13) 和 2-苄基-3-苯基苯并[5,6] 双环 [2.2。