Heterocyclic compounds can be divided into two categories: alicyclic heterocycles and aromatic heterocycles. Compounds whose heterocycles in the molecular skeleton cannot reflect aromaticity are called alicyclic heterocyclic compounds. Compound: 1663-45-2, is researched, Molecular C26H24P2, about A Geometrically Constrained Tricyclic Phosphine: Coordination, Ring Expansion by Insertion of CO into a P-C Bond, and Lewis Acid Initiated Formation of an Oligocyclic Molecule with a P2C22 backbone, the main research direction is molybdenum carbonyl tricyclic phosphine preparation crystal structure; tungsten carbonyl tricyclic phosphine preparation crystal structure; chromium carbonyl tricyclic phosphine preparation crystal structure; aluminum tricyclic phosphine oligocyclic barrelane preparation crystal structure; crystal structure molybdenum chromium tungsten tricyclic phosphine aluminum barrelane; mol structure molybdenum chromium tungsten tricyclic phosphine aluminum barrelane.Recommanded Product: 1663-45-2.
The geometrically constrained tricyclic phosphine 3b has two annulated five-membered PC4 heterocycles with the P atom in a bridgehead position. Treatment with (THF)M(CO)5 (M = Cr, Mo, and W) afforded M(CO)5 complexes 4-6, of which the Cr and Mo compounds showed in heat the unusual insertion of a carbonyl C atom into a P-C bond of one of the strained PC4 rings. Ring expansion yielded a six-membered PC5 heterocycle with an exocyclic C:O group and afforded new phosphine ligand 8 that contains annulated five- (1x) and six-membered (2x) rings. Its Mo complex (7) was obtained by treatment of starting phosphine 3b with excess Mo(CO)6 in hot toluene. Phosphine 8 was removed from the metal atom by addition of the diphosphine Ph2PC2H4PPh2. Treatment of 8 with AlBr3 resulted in enolization and an increased nucleophilicity of the β-C atom, which causes dimerization by P-C bond formation to yield a barrelane type mol. (9).
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis