[60]Fullerene cycloaddition across hindered acenes
作者:Irvinder Kaur、Glen P. Miller
DOI:10.1039/b710300j
日期:——
Diels–Alder cycloadditions of [60]fullerene across sterically hindered 6,13-bis(2′,6′-dialkylphenyl)pentacenes, 1 and 2, produce fullerene–acene monoadducts 3 and 4. In both cases, further [60]fullerenecycloaddition to form cis-bis[60]fullerene adducts is retarded by steric resistance between the [60]fullerene moieties and the o-dialkyl substituents. Instead, the fullerene moieties of monoadducts 3 and
Diels–Alder环加成 [60]富勒烯横跨空间位阻的6,13-双(2',6'-二烷基苯基)并五苯,1和2,产生富勒烯–并发单加合物3和4。在这两种情况下,[60]富勒烯形成顺式-双[60]富勒烯加合物的环加成反应由于[60]富勒烯部分和邻-二烷基取代基之间的空间抗性而受阻。相反,富勒烯一加合物3和4的基团可敏化1 O 2的形成,随后该O 2环加成。并发骨干产生新颖合成和抗[60]富勒烯二氧bisadducts,8 - 11。