P-Functional (acylphosphane)tungsten complexes 4a–f have been prepared in good yields by the reaction of phosphinidenoid complexes 2a–d with acyl chlorides 3a,b. The reactions of acyl(chloro)phosphane complex 4a at –80 °C with organolithium reagents selectively led to the formation of lithiated phospha-enolate complex 5b. The ambident reactivity of this compound was demonstrated in reactions with electrophiles
Insights into the Chemistry of Transient P-Chlorophosphanyl Complexes
作者:Aysel Özbolat-Schön、Maren Bode、Gregor Schnakenburg、Anakuthil Anoop、Maurice van Gastel、Frank Neese、Rainer Streubel
DOI:10.1002/anie.201002885
日期:2010.9.10
CP or CP? One‐electron oxidation of Li/Cl phosphinidenoid complexes led to the discovery of transient P‐chlorophosphanyl complexes 1. Subsequent cross‐coupling and rearrangement or elimination reactions yielded 2 and 3; the latter is the first structurally characterized phosphaquinomethane complex. ESR spectroscopy and DFT calculations support the existence of short‐lived P‐centered radicals.
High-yield synthesis of para-substituted pentacarbonyl(3-phenyl-2H-azaphosphirene)tungsten complexes is reported, using a multi-step rearrangement reaction. Spectroscopic and mass-spectrometric data of these heterocyclic complexes are discussed; the 31P-NMR-chemical shifts clearly reflect the electronic influence of the para-phenyl substituents and the correlation with Hammett σp-constants is almost
Reactivity studies of Li/Cl phosphinidenoid W(CO)5 complexes 2a,b toward various iodine compounds are reported. Transiently generated complexes 2a,b yielded no selective reactions with 3-, 9-, and 9,12-diiodo o-carbaboranes 3a−c, whereas clean transfer-iodination reaction occurred with C-iodo-substituted o-carbaboranes 3d,e, thus giving chloro(iodo)phosphane complex 6a in the case of 2a. Complex 2a was also
Isolation of the first Li/halogen phosphinidenoid transition-metal complex
作者:Aysel Özbolat、Gerd von Frantzius、Wilfried Hoffbauer、Rainer Streubel
DOI:10.1039/b804325f
日期:——
Isolation and characterisation of the first Li/halogen phosphinidenoid transition-metal complex as well as low-temperature solution NMR, MAS-NMR experiments, DFT structures and calculated NMR chemical shifts are reported.