Hydrogen-bond acceptance of bifunctional ligands in an alkyne-metal pi complex.
Experiment and theory have been used to study reactive alkyne pi complexes, intermediates in anti-Markovnikov alkyne hydration by CpRu bis(phosphine) catalysts with heterocyclic substituents. Each heterocycle accepts a hydrogen bond from an acetylene C-H, as revealed by NMR coupling constants between alkyne 13C and 1H nuclei as well as between alkyne 13C and pyridine 15N (2hJCN). Moreover, further alkyne transformations occur at temperatures from 50 to 90 degrees C below what is needed to convert a control compound without the heterocycles.
Grotjahn
Douglas B
DB
Department of Chemistry and Biochemistry, 5500 Campanile Drive, San Diego State University, San Diego, California 92182-1030, USA. grotjahn@chemistry.sdsu.edu
Miranda-Soto
Valentín
V
Kragulj
Elijah J
EJ
Lev
Daniel A
DA
Erdogan
Gülin
G
Zeng
Xi
X
Cooksy
Andrew L
AL