Hydrogen-transfer reactions catalyzed by low-valent, tertiary phosphine complexes of zirconium. Molecular structure of hydrido(.eta.5-cyclooctadienyl)bis[1,2-bis(dimethylphosphino)ethane]zirconium

Syntheses, structures, and properties of phenyltrihydroborate complexes of zirconocene and titanocene

“…Comparing with the bridge Zr-H distances (1.96 (5) The terminal Zr-H distance in 3 is 1.70 (7) Å . This distance is significantly shorter than that in (g 5 -C 5 Me 5 )ZrH(g-C 8 [24], but is comparable to those distances observed in Cp 2 ZrH{(l-H) 2 BC 4 H 8 } (1.68(5) Å ) [12] and (g 5 -C 8 H 11 )ZrH(dmpe) (1.67 Å ) [25].…”

Zirconium and Hafnium: Introduction

“…56 Other hydrogen transfer reactions include (i) the formation of the same products from cyclohexa-l,3-diene and hex-1-ene and (ii) the conversion of but-1-ene into but-2-ene. 57 Homogeneous hydrogenation using an organozirconium catalyst was first noted in 1972, using…”

A zirconoxy carbene from monocarbonylbis(η-cyclopentadienyl)tungsten and permethylzirconocene dihydride: (η5-C5H5)2W=C(H)OZr(H)(η5C5Me5)2

“…Only a few hydride structures have been reported with early transition metals (see Teller & Bau, 1981;Toogood & Wallbridge, 1982). Two structures having Zr and a terminal hydride ligand have been reported: HZr(C8H~i)(dmpe) 2 (Fischer et al, 1980) with a Zr-H bond length of 1.67 A (the coordinates of the H atom were taken from a Fourier difference map and not refined), and [(CsH4Me)2ZrH(p-H)] 2 (Jones & Peterson, 1981) with a Zr-H(terminal) bond length of 1.78 (2) A. Finally, it should be noted that the hydride ligand occupies a stereochemically active position in the equatorial wedge of the (CsMes)2Zr fragment, and the O-Zr-H angle of 98 (1) ° can be reasonably compared to the L-Zr-L angle in other zirconocene complexes, e.g.…”