Add time:07/29/2019         Source:sciencedirect.com

The molecular structure of [Rh(SnCl3)(norbornadiene)(dppb)] (1) and [Rh(SnCl3)(1,5-cyclooctadiene)(dppb)] (2) (dppb = 1,4-bis(diphenylphosphino)butane) has been determined by single-crystal X-ray techniques. In both compounds the structure is best described as distorted square pyramidal with the equatorial positions occupied by the diolefin and the diphosphine respectively and the SnCl3 fragment in the apical position. Substitution of norbornadiene by 1,5-cyclooctadiene favours slightly the trigonal bipyramidal distortion. The P-C-C and C-C-C angles of the aliphatic chain in dppb are larger than expected for sp3 atoms, specially in 2.

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