Georges Sozzi

Intramolecular hydrogen atom abstraction with an eight-membered cyclic transition state in open-chain aliphatic aminium radicals

Abstract Hydrogen abstraction by the nitrogen in long-chain aliphatic gas-phase aminium radicals (amine molecular ions) takes place via six-, seven-, and eight-membered cyclic transition states. The subsequent fragmentation is particularly facile after eight-membered ring hydrogen transfer.

Rearrangement spinal du dimethyl-4,4 epoxy-6α,20α (5α)androstane avec le trichlorure de bore

Abstract A backbone rearrangement of 4,4 dimethyl 6α,20α epoxy (5α)androstane with BCl 3 , is described. The structures of the resulting compounds have been elucidated either by synthesis from 3β-acetoxy (5α)pregnane 20-one, or by X rays diffraction.