Experimental and theoretical analysis of the factors determining the conformation and stability of singlet carbene

Abstract
Experimental and theoretical analyses of 1,2-H shifts in singlet carbene RCH2–C(:)–X (X = Cl, Ph) indicate that hyperconjugation of the carbene Ione pair and the low-lying C–R σ* orbital of the β-substituent plays an important role in determining the relative population of the carbene conformers.

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