Add time:09/06/2019         Source:sciencedirect.com

Various σ-alkenyl complexes of the general composition (alkenyl)V(CO6−npm (where n = 2, 3 and pm is a potentially m-dentate phosphine coordinated through n of its donor centres, n ⩽ m) have been prepared by photo-induced hydrovanadation of the alkynes 2-butyne, 1-hexyne, 3-hexyne and 3,3-dimethyl-1-butyne. In each case the Z isomer is formed exclusively or as the predominant product. Reaction of hexacarbonylvanadate with pyridinium bromide and pm leads to the bromo complexes BrV(CO)6−npm (n  2–4). In the case of pm = Me2PCH2CH2PMe2 (dmpe), the complex Br2V(dmpe) is also formed. The complex I2V(dmpe)2 · toluene was obtained as a by-product from the reaction between [Et4N][V(CO)4dmpe] and perfluoro-isopropyl iodide. The face-capped, trigonal-prismatic complex CIV(CO) 2(pepe)2 · benzene (pepe = Ph2PCH2CH2PEt2) was obtained from the photo-reaction between HV(CO)4pepe and [Et4N]C1. Single-crystal X-ray diffraction studies were carried out on all three complexes. The 51V NMR chemical shifts for the seven-coordinate complexes XV(CO)npm have been used to arrange the ligands X in a magnetochemical series of ligand strengths (alkenyl ≌ alkyl < SiMe3 < H ≌ Br ≌ I < O2CR < Cl ≌ N3 < CN).

We also recommend Trading Suppliers and Manufacturers of 1-Bromo-2-Hexyne (cas 18495-25-5). Pls Click Website Link as below: cas 18495-25-5 suppliers