Keto <SUP>></SUP><SUB><</SUB> enol equilibria for and oxidative cyclization to benzofurans of 2,2-ditipyl-1-R-ethenols. Comparison with dimesityl analogs
Keto <SUP>></SUP><SUB><</SUB> enol equilibria for and oxidative cyclization to benzofurans of 2,2-ditipyl-1-R-ethenols. Comparison with dimesityl analogs
Static and Dynamic Stereochemistry and Solvation of 2,2-Ditipylethenols<sup>1</sup>
作者:Joseph Frey、Zvi Rappoport
DOI:10.1021/jo971049z
日期:1997.11.1
The effect of increased bulk of the beta-aryl group in enols Ar(2)C=C(OH)R from Ar = mesityl = Mes (1) to Ar = 2,4,6-i-Pr(3)C(6)H(2) = Tip (2) was investigated. The solid-state structure when R = H (a) does not significantly differ for 1a and 2a. The dynamic behavior of 2a resembles that of 1a, but the rotational barriers for both the threshold one-ring flip process and the two-ring flip process are
Keto <SUP>></SUP><SUB><</SUB> enol equilibria for and oxidative cyclization to benzofurans of 2,2-ditipyl-1-R-ethenols. Comparison with dimesityl analogs