P.R. Singh

Novel electron transfer mechanism in lithium alanate reduction of benzylic halides

Abstract Occurrence of a new electron transfer mechanism in the LiAlH 4 reduction of 9-chloromethylanthrancene, diphenylchloromethane and 9-bromofluorene is demonstrated. Alanate anion serves as a source of electrons and hydrogen atoms.

Reduction of Z-2-chlorostilbene with lithium aluminum hydride: evidence for an electron transfer radical mechanism☆

Abstract Z -2-Chlorostilbene undergoes uncatalyzed LiAlH 4 reduction giving phenanthrene and Z -stilbene. An electron transfer radical mechanism is proposed. LiAlH 4 induced isomerization of Z -stilbene produces E -stilbene.

Radical nucleophilic substitution mechanism in the reactions of arenediazonium cations with nitrite ion

Abstract Reactions of arenediazonium cations with nitrite ion generally believed to involve nucleophilic displacement have been found to occur via single electron transfer where free radicals intervene.

Electron transfer mechanism in lithium aluminium hydride reduction of organomercuric halides

Abstract A new electron transfer free radical mechanism has been proposed for the reduction of a few organomercuric halides with LiAlH4. Symmetrization of arylmercuric halides in these reactions has been observed for the first time.

Electron transfer free radical mechanism in the reactions of arenediazonium cations with grignard reagents

Abstract The major pathway in the reactions of arenediazonium cations with certain Grignard reagents is found to involve an electron transfer from the latter to the π-system of the former reactant and radicals are the immediate precursors of the final products.

Simultaneous occurrence of electron transfer initiated radical cage collapse and chain mechanisms in the reactions of diaryliodonium cations with 2-nitropropanate anion

Abstract Simultaneous occurrence of free radical cage and chain mechanisms initiated by single electron transfer in the reactions of diaryliodonium cations with 2-nitropropanate anion has been established.

Mechanisms in the reaction of arenediazonium cations with 2-nitropropanide anion

Abstract Lithium 2-nitropropan-2-ide reacts, in MeOH solvent, with benzenediazonium and p-methoxybenzenediazonium cations to give diazo-coupled products, but with p-nitrobenzenediazonium cation by competing electron transfer and diazo-coupling reactions.