Interpretation of the reactivity of benzyl free radical towards peroxyacids in terms of orbital interactions. Competition between energy gap control and overlap control
The factors which control the reactivity of alkyl freeradicals R˙ in reaction (i) are studied. The reactivity [graphic omitted] R′→ R – OH + R′CO˙2(i), of R˙ in (i) depends on the key orbitalinteractionbetween the SOMO of the radical and the LUMO of the peroxyacid. This interaction involves two contributions: (i) the energygap SOMO–LUMO and (ii) the overlap SOMO–LUMO. In reaction (i) the main factor
作者:Pavel A. Krasutsky、Igor V. Kolomitsyn、Evgenij M. Botov、Robert M. Carlson、Irina G. Semenova、Andrey A. Fokin
DOI:10.1016/s0040-4039(02)02151-2
日期:2002.11
Selective carboxylic acid decarboxylation was elaborated. Generation of acyltrifluoroacetyl peroxides from carboxylic peracids and trifluoroacetyl anhydride (Method A), as well as from trifluoroperacetic acid and acyltrifluoroacetyl anhydride (Method B), leads to simultaneous peroxide decomposition into the corresponding alkyltrifluoroacetates. DFT computations, as well as experimental data, support an acid-catalyzed heterolytic mechanism for acyltrifluoroacetyl peroxide decomposition. (C) 2002 Elsevier Science Ltd. All rights reserved.