Photochemical transformation of β,β′-dithienyl substituted o-divinylbenzenes leading to 1,2-dihydronaphthalenes or fused pentacyclic compounds: first evidence of electrocyclization process via 2,3-dihydronaphthalene intermediates
作者:Dragana Vuk、Željko Marinić、Krešimir Molčanov、Biserka Kojić-Prodić、Marija Šindler-Kulyk
DOI:10.1016/j.tet.2012.06.019
日期:2012.8
The photochemical behaviour of 2,2′-(o-phenylenedivinylene)dithiophenes (7a–c), 3,3′-(o-phenylenedivinylene)dithiophene (8a) and 3,3′-(o-phenylenedivinylene)dibenzothiophene (8b) was studied under the low concentrations. An intramolecular reaction via the 2,3-dihydronaphthalene intermediate has been observed in all studied examples accompanied by dimerization and polymerization. The 1,2-dihydro-2,
2,2'-(邻苯基二亚乙烯基)二噻吩(7a - c),3,3'-(邻苯基二亚乙烯基)二噻吩(8a)和3,3'-(邻苯基二亚乙烯基)二苯并噻吩(8b)的光化学行为在低浓度下进行了研究。在所有研究的实施例中都观察到了经由2,3-二氢萘中间体的分子内反应,伴随着二聚和聚合。从2-噻吩衍生物中分离出1,2-二氢-2,3-二噻吩基萘(9a – c)(7–9%),而3-噻吩衍生物具有多环结构(13–44%产率)。