Diastereoselective Self-Assembly of Chiral Diamine-Chelated Aryllithiums to Dimeric Aggregates
作者:Anne M. Arink、Claudia M. P. Kronenburg、Johann T. B. H. Jastrzebski、Martin Lutz、Anthony L. Spek、Robert A. Gossage、Gerard van Koten
DOI:10.1021/ja045914q
日期:2004.12.1
Aryllithium compounds [LiC6H4(CH2N(Et)CH2CH2NEt2)-2](2) (2b), [LiC6H4(CH(Me)N(Me)CH2CH2NMe2-(R))-2](2) ((R)-3b), and [LiC6H4(CH(Me)N(Me)CH2CH2NMe2-(rac))-2](2) ((rac)-3b) were synthesized and characterized in the solid state and in solution. X-ray crystallographic studies of 2b and (R)-3b and molecular weight determinations of 2b, (R)-3b, and (rac)-3b by cryoscopy in benzene showed that, both in the solid state and in apolar, noncoordinating solvents such as benzene, these compounds exist as discrete dimeric aggregates. For (R)-3b and (rac)-3b the aggregation process of two monomeric aryllithium units to one dimer is highly diastereoselective.