Photodehydrocyclizations in stilbene-like compounds. Part V. Photochemistry of 2,2′-distyrylbiphenyl
作者:W. H. Laarhoven、Th. J. H. M. Cuppen
DOI:10.1039/p19720002074
日期:——
The photochemistry of 2,2′-distyrylbiphenyl (I) has been investigated. Irradiation under nitrogen gives, as the kinetically controlled product, trans,trans,trans-1,2,2a,10b-tetrahydro-1,2-diphenylcyclobuta[I]phenanthrene (IIa), and as the thermodynamically-controlled product 4,5,9,10-tetrahydro-4,9-diphenylpyrene (IXa). Irradiation under nitrogen in the presence of iodine gives 7-phenylbenzo[c]chrysene
已经研究了2,2'-二苯乙烯基联苯(I)的光化学。在氮气下辐照得到作为动力学控制产物的反式,反式,反式-1,2,2a,10b-四氢-1,2-二苯基环丁[ I ]菲(IIa),作为热力学控制产物4,5 ,9,10-四氢-4,9-二苯基py(IXa)。在碘的存在下,在氮气下照射,得到7-苯基苯并[ c ] ch(IV)。讨论了机制。在240中加热(I)°给出顺,顺,顺式-1,2,2a,10b-四氢-1,2- diphenylcyclobuta [我菲(IIb)是唯一的主要产物。异构体(IIa)和(IIb)在加热和辐射下的行为有很大不同。在两种条件下,(IIa)均转化为(I),(IIb)转化为和菲。(IIa和b)的非周环转化的立体特异性被标记。