Chemoselective Conversion of Conjugated Nitroalkenes into Ketones by Sodium Borohydride-Hydrogen Peroxide: A New Synthesis of 4-Oxoalkanoic Acids, Dihydrojasmone and (±)-<i>exo</i>-Brevicomin
作者:Roberto Ballini、Giovanna Bosica
DOI:10.1055/s-1994-25557
日期:——
A new, simple, cheap, and practical procedure for the direct transformation of α,β-unsaturated nitroalkenes into ketones has been realized by the NaBH4/H2O2 system. By this method, other functional groups such as C-C double bonds, ketals or aromatic nitro groups were preserved. Application of this methodology to the preparation of 4-oxoalkanoic acids, dihydrojasmone, and (±)-exo-brevicomin is also reported.
[EN] PHENOL AND CYCLOHEXANONE MIXTURES<br/>[FR] MÉLANGES DE PHÉNOL ET DE CYCLOHEXANONE
申请人:EXXONMOBIL CHEM PATENTS INC
公开号:WO2012036823A1
公开(公告)日:2012-03-22
Disclosed herein is a process for producing phenol. The process includes oxidizing at least a portion of a feed comprising cyclohexylbenzene to produce an oxidation composition comprising cyclohexyl-1 -phenyl- 1 -hydroperoxide. The oxidation composition may then be cleaved in the presence of an acid catalyst to produce a cleavage reaction mixture comprising the acid catalyst, phenol and cyclohexanone. At least a portion of the cleavage reaction mixture may be neutralized with a basic material to form a treated cleavage reaction mixture. In various embodiments, the cleavage reaction mixture contains 1 wt% to 30 wt% phenol, 1 wt% to 30 wt% cyclohexanone and a complexation product.
Scope and Mechanism of the Ruthenium-Catalyzed Deaminative Coupling Reaction of Enones with Amines via Regioselective C<sub>α</sub>–C<sub>β</sub> Bond Cleavage
作者:Dulanjali S. Thennakoon、Marat R. Talipov、Chae S. Yi
DOI:10.1021/acs.organomet.3c00321
日期:2023.10.9
A highly regioselective C–C bond cleavage method of enones has been devised from the ruthenium-catalyzed deaminative coupling reaction with simple amines. The analogous catalytic coupling reaction of enones with anilines has led to a regioselective Cα–Cβ bond cleavage of enones in forming N-alkylanilines and 2,4-disubstituted quinolines. The reaction profile study showed the formation of a β-aminoimine
Cyanocuprates Convert Carboxylic Acids Directly into Ketones
作者:Douglas T Genna、Gary H. Posner
DOI:10.1021/ol202237j
日期:2011.10.7
Carboxylic acids were converted directly in 56-99% yields into methyl, n-butyl, and isopropyl ketones using excess cyanocuprates R2CuLi center dot LiCN. A substrate with a stereocenter alpha to the carboxylic acid was converted into ketones with very little loss of enantiomeric purity. A variety of functional groups were tolerated including aryl bromides. This direct transformation of a carboxylic acid into ketone with minimal tertiary alcohol formation is proposed to involve a relatively stable copper ketal tetrahedral intermediate.
Relative molecular mass information from aliphatic nitro compounds: A chemical ionization study
作者:James A. Ballantine、Jonathan D. Barton、James F. Carter、Jeremy P. Davies、Keith Smith、Geoffrey Stedman、Eric E. Kingston
DOI:10.1002/oms.1210230102
日期:1988.1
AbstractThe mass spectra of a number of aliphatic nitro compounds have been studied using electron Ionization (EI) and a variety of chemical Ionization (CI) techniques in attempts to obtain relative molecular mass information. The use of positive ion ammonia chemical Ionization techniques gave very satisfactory results, providing abundant [M + NH4]+ ions, not only from both primary and secondary nitro compounds, but also from the much more labile tertiary nitro compounds. However, the use of methane and isobutane positive ion CI or EI conditions resulted in facile fragmentation with little relative molecular mass information being made available. Negative ion CI using methane, isobutane or ammonia as moderating gases all gave abundant [M − 1]− ions with primary and secondary nitro compounds but at much reduced sensitivity.