Synthesis, characterization and spectroscopy of alkyl substituted edge-bridged open ruthenocenes
作者:Rein U. Kirss
DOI:10.1016/j.ica.2004.03.029
日期:2004.8
The edge-bridged open ruthenocenes bis(eta(5)-6,6-dimethylcyclohexadienyl)ruthenium (1), bis(eta(5)-2,6,6-trimethylcyclohexadienyl) ruthenium (2), bis(eta(5)-3,6,6-trimethylcyclohexadienyl)ruthenium (3), bis(eta(5)-2,4,6,6-tetramethylcyclohexadienyl)ruthenium (4) are prepared by reactions between di-mu-chlorodichlorobis[(1-3eta:6-8eta)-2,7-dimethyloctadienyl] diruthenium and the corresponding dienes. Compound 4 can also be prepared in lower yield by reduction of RuCl3 (.) nH(2)O with zinc in the presence of 2,4,6,6-tetramethylcyclohexadiene. Variable temperature H-1 NMR studies of 1-4 reveal rapid rotation about the Ru-C bonds. The barrier to rotation in 4 is 7.7 kcal/mol with a gauche-eclipsed ground state conformation. Even lower barriers to rotation in 1-3 contribute to the inability to accurately measure their activation energies in toluene. (C) 2004 Elsevier B.V. All rights reserved.
Chiurdoglu; Maquestiau, Bulletin des Societes Chimiques Belges, 1951, vol. 60, p. 47,53
作者:Chiurdoglu、Maquestiau
DOI:——
日期:——
Hirsjaervi, Suomen Kemistilehti B, 1939, vol. 12, p. 3