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A Theoretical Investigation of Photochemical Reactions of an Isolable Silylene with Benzene
Author(s) -
Su MingDer
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201402626
Subject(s) - silylene , conical intersection , benzene , chemistry , photochemistry , singlet state , silylation , ring (chemistry) , excited state , radical , computational chemistry , molecule , catalysis , organic chemistry , silicon , atomic physics , physics
The mechanisms of photochemical insertion reactions are investigated theoretically using the model system, an isolable dialkylsilylene and benzene, using the CAS(10,10)/6‐31G(d) and MP2‐CAS‐(10,10)/6‐311++G(df,pd)//CAS(10,10)/6‐31G(d) methods. The structures of the conical intersections, which play a key role in such photoinsertion reactions, are determined to provide a qualitative explanation of the reaction pathways. The model investigation demonstrates that the preferred reaction route for the isolable dialkylsilylene with benzene is as follows: reactants → Franck–Condon region → conical intersection → seven‐membered‐ring photoproduct. The theoretical findings suggest that the singlet excited dialkylsilylene should attack benzene in the perpendicular conformation, and that no silyl radicals should exist during these photoinsertion reactions. The results obtained allow a number of predictions to be made.