Reactions of organic anions. Part 109. Vicarious nucleophilic substitution of hydrogen in nitroarenes with carbanions of .alpha.-haloalkyl phenyl sulfones
Specific ortho orientation in the vicarious substitution of hydrogen in aromatic nitro compounds with carbanion of chloromethyl phenyl sulfone
作者:M. Makosza、T. Glinka、A. Kinowski
DOI:10.1016/s0040-4020(01)91141-x
日期:1984.1
Vicariousnucleophilic substitution of hydrogen atoms in nitroarenes with chloromethylphenyl sulfone proceeds selectively ortho to the nitro group when carried out in t-BuOK/THF base/solvent system. In the majority of 3-substituted nitrobenzene derivatives substitution occurs at the most hindered position 2. These conditions offer an efficient method of synthesis of 2,6 and 2,3-disubstituted nitrobenzene
Vicarious Nucleophilic Substitution of Nitrobenzenes
作者:Gerath A. DeBoos、David J. Milner
DOI:10.1080/00397919408020772
日期:1994.4
Abstract Vicariousnucleophilicsubstitution (VNS) by dichloroacetate and other reagents has been applied in good yield to various ortho-substituted nitrobenzenes including 2-nitrotoluene and 2-nitro ethylbenzene. For alkyl nitrobenzenes, ease of VNS increased para < ortho < meta and methyl < ethyl < iso-propyl. Formation of chlorine-free products upon VNS by methyl dichloroacetate suggests the involvement