A substituent chemical shift (SCS) effect study by13C and19F NMR ofpara-substituted phenylhalodiazirines
作者:Jacek Terpinski、Dorothy Z. Denney、Richard Beveridge、D. Phillip Cox、Robert A. Moss
DOI:10.1002/mrc.1260251018
日期:1987.10
A range of 3-(para-substituted-phenyl)-3-halodiazirines have been prepared and their 13C and 19F NMR spectra measured. Calculated with these data were the susceptibility coefficients ρI and ρR of the inductive (σI) and resonance (σR0) effects, respectively, to substituent-induced chemical shift differences at the diazirine carbon (13C NMR) and the 3-fluorine (19F NMR of the 3-fluorodiazirine series). An inverse relationship was found between the susceptibility parameters and the electronegativity of the halo substituent at the diazirine carbon.
Synthesis of µ-carbene and µ-carbyne complexes of rhodium and cobalt from substituted diazirines. Crystal structures of [Rh<sub>2</sub>(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)<sub>2</sub>(CO)<sub>2</sub>{µ-C(C<sub>6</sub>H<sub>4</sub>F-4)(OMe)}] and [Rh<sub>2</sub>(η<sup>5</sup>-C<sub>5</sub>Me<sub>5</sub>)<sub>2</sub>(µ-CO)(µ-C<sub>6</sub>H<sub>4</sub>Me-4)][BPh<sub>4</sub>]
作者:Anthony G. Avent、Stephen A. Benyunes、Penny A. Chaloner、Nigel G. Gotts、Peter B. Hitchcock
DOI:10.1039/dt9910001417
日期:——
The reaction of aryl(methoxy)diazirines with [M2(η5-C5Me5)2(µ-CO)2](M = Rh or Co) affords the µ-carbenecomplexes [M2(η5-C5Me5)(CO)2µ-CR(OMe)}](R = aryl) in excellent yield. The carbonyl groups are terminal in the rhodiumcomplexes, as demonstrated conclusively in an X-ray diffraction study, but bridging for the cobalt complex. Thermolysis of the rhodiumcomplexes results in loss of CO and the formation