A hydridovinyliridium complex more stable than its .eta.2-ethylene isomer

New copper(I) phosphane complexes of dihydridobis(3-nitro-1,2,4-triazolyl)borate ligand showing cytotoxic activity

“…In particular poly(pyrazolyl)borate copper derivatives, synthesized in order to model various properties of copper-containing natural products, have been discussed in a review devoted to the structure and function of copper proteins [23]. Very little has been done on poly(pyrazolyl)borate systems bearing electron withdrawing substituents [24][25][26][27][28][29][30][31]. The electron withdrawing substituents in polyfluorinated ligands [32] commonly improve oxidation resistance, thermal stability, and solubility of metal complexes.…”

C–H Activation of 3,3-diphenylcyclopropene in the reaction with Os(CO)2(PPh3)3: 3,3-diphenylcyclopropenyl, 2,2-diphenylcyclopropyl, and 3-phenylindenyl complexes of osmium(II)

“…The situation is reminiscent of that existing in the interaction of ethylene with low oxidation state iridium centres where the hydrido-, vinyl-product is sometimes more stable than the g 2 -ethylene adduct [30,31]. The only other example of a cyclopropenyl ligand bound to a transition metal through one of the alkene carbon of which we are aware was derived from the reaction of Pt(C 2 H 4 )(PPh 3 ) 2 with 3-chloromethyl-1,2-dichloro-3-methycyclopropene.…”

“…The white residue thus obtained was recystallised from dichloromethane/ethanol to give pure 4 as a colourless microcrystalline solid (0.080 g, 56% ), 178.6 (apparent t, 2 J CP = 8.5 Hz, CO), 269.8 (apparent t, 2 J CP = 6.1 Hz, Os@COH). 31 4.6. X-ray crystal structure determination for complex 2 X-ray intensity data were recorded on a Siemens SMART diffractometer with a CCD area detector using graphite monochromated Mo Ka radiation (k = 0.71073 Å ) at 85 K. Data were integrated and corrected for Lorentz and polarisation effects using SAINT [43].…”

Unsymmetrical 3- and 5-substituted bis(pyrazolyl)borate system

“…In particular, the syntheses of tris(pyrazolyl)borate ligands bearing trifluoromethyl substituents are highly regioselective with the more electron-withdrawing CF 3 group residing exclusively in the 3-position of the final product [14,15].…”