The tris (2-thienyl) methyl cation problem. NMR spectroscopic study

B Abarca, G Asensio, R Ballesteros…

Index: Abarca, Belen; Asensio, Gregorio; Ballesteros, Rafael; Varea, Teresa Journal of Organic Chemistry, 1991 , vol. 56, # 10 p. 3224 - 3229

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Citation Number: 46

Abstract

A series of homologues of the trityl cation obtained by total or partial substitution of the phenyl ring8 for 2-or 3-thienyl groups has been studied by 1H and 18C NMR. In general, the spectral parametera found follow the expected trends. However, a moat unexpected effect is found in the transformation of tris (2-thieny1) carbinol (la) into tris (24hienyl) methyl cation (2d), since the increase of the total chemical shift (Azfi) associated with the ionization is as ...