3053-61-0Relevant academic research and scientific papers
Catalytic Cleavage of Unactivated C(aryl)-P Bonds by Chromium
Ling, Liang,Luo, Meiming,Tang, Jinghua,Yuan, Shuqing,Zeng, Xiaoming
, p. 1581 - 1586 (2022/03/14)
We describe here the coupling to transform aryl phosphine derivatives by the cleavage of unactivated C(aryl)-P bonds with chromium catalysis, allowing us to achieve the reaction with alkyl bromides and arylmagnesium reagents under mild conditions. Mechani
Intramolecular hydrophosphination/cyclization of phosphinoalkenes and phosphinoalkynes catalyzed by organolanthanides: Scope, selectivity, and mechanism
Douglass,Stern,Marks
, p. 10221 - 10238 (2007/10/03)
Organolanthanide complexes of the general type Cp′2LnE(TMS)2 (Cp′ = η/5-Me5C5; Ln = La, Sm, Y, Lu; E = CH, N; TMS = SiMe3) serve as effective precatalysts for the rapid intramolecular hydro
Temperature-dependent Ring-Opening and -Closure of a Cyclic Phosphane-Borane
Sigl, Marcus,Schier, Annette,Schmidbaur, Hubert
, p. 951 - 954 (2007/10/03)
A phosphane-borane (3) with the P-B bond integrated into a seven-membered ring was prepared from 4-pentenyl-diphenylphosphane (4) by hydroboration using 9-borabicyclononane (9-BBN). The product was confirmed to have a ring structure in the solid state by single crystal X-ray diffraction. The P-B distance of 2.057(2) A is indicative of a standard donor-acceptor bond similar to the type found in homologous five- and six-membered rings. The room-temperature 31P-NMR signal of the compound in various solvents (δ = - 15) is not compatible with the cyclic structure and suggests that ring opening occurs as the compound is dissolved. Variable-temperature NMR work corroborated this assumption, and the enthalpy of ring closure was determined to be ΔH = -30.5(4) kJmol-1. In CD2Cl2 at -90°C, δ31P is shifted to +3.5 ppm to low field, suggesting virtually complete ring closure under these conditions. VCH Verlagsgcsellschaft mbH,.
