Substituted metal carbonyls. Part 5. Convenient syntheses of some group 6 phosphine and pyridine substituted penta- and tetra-carbonyls and isolation of the singly bridging 1,2-bis(4-pyridyl)ethylene dimetal decacarbonyl complexes
作者:T.S.Andy Hor
DOI:10.1016/s0020-1693(00)85835-1
日期:1988.3
Synthese des complexes M(CO) 5 (L) et M(CO) 4 (P-P) (P-P=Ph 2 PCH 2 PPh 2 , Ph 2 PC 3 H 6 PPh 2 ), Mo 2 (CO) 10 (μ-dppe)
合成配合物M(CO)5(L)和M(CO)4(PP)(PP = Ph 2 PCH 2 PPh 2,Ph 2 PC 3 H 6 PPh 2),Mo 2(CO)10(μ-dppe )
Dihydropyridines in Organometallic Synthesis. Formation of Pyridine and Dihydropyridine-Stabilized Alkylidene Complexes of Tungsten(0) and Chromium(0) from Fischer Carbene Complexes: Structure and Reactivity
1,2- and 1,4-dihydropyridines react with alkoxycarbene complexes of chromium and tungsten to give, upon an unprecedented hydride transfer, alcohol elimination, and pyridine fixation on the carbene carbon, a new class of air-stable pyridinium ylide complexes. These pyridine-protected alkylidene complexes of chromium(0) and tungsten(0) were fully characterized by X-ray crystallography. In the case of
Application of time-resolved photoacoustic calorimetry to CrL bond enthalpies in Cr(CO)5L
作者:Gilbert K. Yang、Veronica Vaida、Kevin S. Peters
DOI:10.1016/s0277-5387(00)81787-8
日期:1988.1
Using time-resolved photoacousticcalorimetry, the CrL bond enthalpies in Cr(CO)5L for a variety of ligands have been measured. Also, the enthalpy and entropy of activation for the displacement of heptane in Cr(CO)5(heptane) by pyridine and 2-picoline have been determined.
Ultraviolet photoelectron spectra of 4-substituted pyridine-pentacarbonylchromium complexes
作者:M.A. Weiner、A. Gin、M. Lattman
DOI:10.1016/s0020-1693(00)93881-7
日期:1977.1
Abstract The ultravioletphotoelectronspectra of Cr(CO) 5 (4-RPyr) have been measured, and the IP's observed below 12 eV are discussed. Bands found in the region 7-8 eV are assigned to ionization from the chromium d orbitals. The IP values are shown to increase with the increasing electron acceptor nature of the ring substituents. The remaining bands below 12 eV are assigned to the pyridine orbitals
Cycloheptatriene and tropylium metal complexes. Part IV. Preparation of 7-exo-substituted tricarbonylcycloheptatrienechromiums
作者:P. L. Pauson、G. H. Smith、J. H. Valentine
DOI:10.1039/j39670001057
日期:——
The 7-exo-configuration is assigned to all substituted tricarbonylcycloheptatrienechromiums previously prepared by the “normal” reaction of tricarbonyltropyliumchromium salts with anions. Several new examples are described, and displacement of methoxide from tricarbonyl-7-exo-methoxycycloheptatrienechromium is shown to be an advantageous alternative route to these products.