A Simple Batch Reactor for the Efficient Multiple Use of Polymer-Bound α,α,α‘,α‘-Tetraaryl-1,3-dioxolane-4,5-dimethanol Titanates in the Nucleophilic Addition of Dialkylzinc Reagents to Aldehydes
作者:Paul J. Comina、Albert K. Beck、Dieter Seebach
DOI:10.1021/op9700441
日期:1998.1.1
A new apparatus for heterogeneous-catalyst-mediated transformations is described. Results for a variety of enantioselective dialkylzinc additions to aldehydes mediated by polymer-bound alpha, alpha, alpha', alpha'-tetraargl-1,3-dioxolane-4,5-dimethanol titanates (pb-Ti-TADDOLs) using this new apparatus are given, In particular the active catalyst:, once prepared, can be used many times with minimal loss of activity or enantioselectivity, The relative rate of reaction using the pb-Ti-TADDOLates as compared to a homogeneous Ti-TADDOLate has also been determined.