Synthesis of a configurationally stable three-legged piano-stool complex
Author(s)
Ward, Thomas R.
Date issued
1999
In
Angew. Chem., Int. Ed.
Vol
3
No
38
From page
405
To page
408
Subjects
configurationally stable three legged piano stool ruthenium pyrazolylmethyl phosphinoethyl benzene complex prepn crystal structure mol structure pyrazolylmethyl phosphinoethyl benzene ruthenium complex
Abstract
Nucleophilic substitution of 3,5-bis(trifluoromethyl)pyrazole with 3-bromobenzyl bromide followed by a Stille vinylation and a radical addn. of HPPh2 on the resulting double bond affords the donor ligand in 79% overall yield. Coordination of phosphine from donor ligand to [{(?6-C6H5CO2Et)RuCl2}2] and subsequent thermal displacement of the arene ligand affords ruthenium arene phosphine complexes (R)-I and (S)-I. Treating I with excess of AgOSO2CF3 in THF affords title complexes II as a mixt. of (RRu,S) and (SRu,R) diastereomers. The crystal structure of (S)-I and II were detd. [on SciFinder(R)]
Publication type
journal article