Treatment of a mixture of α-halogeno-esters and carbonyl compounds with low-valent tantalum prepared readily from tantalum(V) chloride and activated zinc, afforded β-hydroxy-esters in moderate to good yields.
Regio- and Stereoselectivity of Water Elimination as a Function of Ring Size
作者:Björn Greve、Peter Imming
DOI:10.1021/jo970989g
日期:1997.11.1
The elimination of water from tertiary alcohols was studied for carbocycles of ringsize 5-16. The resulting olefins 3-5 were discriminated by NMR spectroscopy. The relative amount of their formation reflects the steric idiosyncrasies of the respective ring systems. The behavior of the medium-sized rings yielded experimental proof to the I-strain concept.