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Lower photoreactivity of 3‐methyl‐3‐(4′‐biphenylyl)‐t‐butene
Author(s) -
Wu GuoSheng,
Hu Jun,
Li JiangPin,
Xu JianHua
Publication year - 1992
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19920100609
Subject(s) - chemistry , medicinal chemistry , 2 butene , 1 butene , organic chemistry , catalysis
Direct and sensitized photolyses of 3‐methyl‐3‐(4′‐biphenylyl)‐1‐butene gave 1,1‐dimethyl‐2‐(4′‐biphenylyl)cyclopropane as primary product and 2‐methyl‐4‐(4′‐biphenylyl)‐1‐butene as secondary product with quantum yields of 7.6×10 −3 and 5.6×10 −3 , respectively. On direct photolysis, the triplet reactant rearranged with a quantum yield of 4.4×10 −3 and is more reactive than the singlet. The exceptionally low photoreactivity shows that the excitation energy is largely localized on the biphenylyl portion but can be delivered to the reaction center slowly.