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.
Observation of a Stable Carbocation in a Consecutive Criegee Rearrangement with Trifluoroperacetic Acid
作者:Pavel A. Krasutsky、Igor V. Kolomitsyn、Paul Kiprof、Robert M. Carlson、Andrey A. Fokin
DOI:10.1021/jo991745u
日期:2000.6.1
Selective oxidative cleavage-cyclization of adamantane through the bridge carbon was developed in trifluoroperacetic acid (TFPAA). The methyl group in the bridge position was found to be the substituent that directs consecutive oxygen insertion into the cage structure during the course of a Criegee rearrangement. The formation of stable 5-methyl-4,6-dioxabishomoadamant-5-yl cation at -25 degrees C
A Novel Catalytic Pathway for Perfluoroacyl Peroxide Synthesis
作者:Pavel A. Krasutsky、Igor V. Kolomitsyn、Robert M. Carlson
DOI:10.1021/ol016338v
日期:2001.9.1
[GRAPHICS]A new catalytic method for synthesis of bis(perfluoroacyl) peroxides (BPFAP) was elaborated by using hydrogen peroxide and perfluoroacyl anhydrides. The desired BPFAP were formed quantitatively in situ when perfluoroacyl anhydride was mixed with hydrogen peroxide (ratio greater than or equal to 2:1) in the presence of a catalytic amount of the carboxylate RfCOO- M+. The essentially irreversible character of this process was shown experimentally and supported on the basis of DFT calculations. The synthesis of new acetyltrifluoroacetyl peroxides is also described.
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.