Z. N. Parnes

Influence of added salts and acids on the ionic hydrogenation of thiophenes

1. n nThe ionic hydrogenation of thiophenes is greatly accelerated by a large excess of trifluoroacetic acid or small quantities of p-toluenesulfonic acid or neutral salts (lithium perchlorate and lithium tosylate). n n n n n2. n nIn the hydrogenation of 2-ethylthiophene use of excess CF3COOH or addition of p-toluenesulfonic acid or LiClO4 not only accelerates the reaction but also increases the yield of 2-ethyltetrahydrothiophene.

Preparation of 2,2′-octahydrodithienyl and its complexes with HgCl2 and CdCl2

The ionic hydrogenation of 2,2′-dithienyl with triethylsilane and trifluoroacetic acid gave 2,2′-octahydrodithienyl, which was characterized by its complexes with HgCl2 (II) and CdCl2 (II).

Synthesis of branched deuterohydrocarbons, containing deuterium at a tertiary carbon atom

A method for the synthesis of branched deuterohydrocarbons, containing duterium attached to a tertiary carbon atom, was proposed on the basis of the ionic hydrogenation reaction.