Triphos derivatives and diphosphines as ligands in the ruthenium-catalysed alcohol amination with NH<sub>3</sub>
作者:N. Nakagawa、E. J. Derrah、M. Schelwies、F. Rominger、O. Trapp、T. Schaub
DOI:10.1039/c5dt04870b
日期:——
triphos derivatives with electron-donating functional group were synthesized and used as ligands in the Ru-catalysed alcohol amination with NH3. The triphos derivatives are effective for the formation of primary amines. On the other hand, if hemilabile diphosphines as tridentate ligands are used, mixtures of secondary-along with primary amines are obtained. It was found that even simple diphosphines can
Intramolecular Exchange of Coordinated and Dangling Phosphine Groups in Pentacarbonyl[(diphenylphosphino)(di-<i>p-</i>tolylphosphino)methane]tungsten(0)
作者:Richard L. Keiter、Deliang Chen、Geoffrey A. Holloway、Ellen A. Keiter、Yi Zang、M. Todd Huml、Jonathan Filley、Douglas E. Brandt
DOI:10.1021/om300092x
日期:2012.6.25
determined for the isomerization of the linkage isomers (OC)5W[κ1-PPh2CH2P(p-tolyl)2] (5) and (OC)5W[κ1-P(p-tolyl)2CH2PPh2] (6). It is proposed that this intramolecular exchange involves a nucleophilicattack of the pendant phosphine on a cis carbonylgroup, followed by ring opening and a 1,2-shift.
平衡常数和速度已被确定为键异构体的异构化(OC)5 W [κ 1 -PPh 2 CH 2 P(p -甲苯基)2 ](5)和(OC)5 W [κ 1 -P(对甲苯基)2 CH 2 PPh 2 ](6)。提出这种分子内交换涉及侧基膦对顺式羰基的亲核攻击,然后开环和1,2-移位。
Asymmetric Hydrogenation of Dehydroamino Acids and Dehydrodipeptides with Rhodium(I)-modified DIOP Catalysts
the dioxolane ring had a small effect on the asymmetric induction by DIOP in the hydrogenation. Modification at the phosphino group affected the stereocontrol by the ligand and the unsymmetrical DIOP with di-2-naphthylphosphino group gave higher optical yields than (−)-DIOP for the hydrogenation of α-acetamidocinnamic acid and dehydrodipeptides.
Synthesis of molybdenum-rhodium and molybdenum-iridium compounds linked by a heterodifunctional ligand and formation of molybdenum-iridium dihydrides by reaction with molecular hydrogen
作者:Charles P. Casey、R. Morris Bullock、Francois Nief
DOI:10.1021/ja00364a019
日期:1983.12
The preparation of a series of Rh(i)-Mo and Ir(I)-Mo compounds is reported. In addition, the formation of dihydrides from the oxidative addition of H/sub 2/ to the Ir(I) centers is discussed.