SCHEDULED MAINTENANCE
Diazoalkane complexes of ruthenium with tris(pyrazolyl)borate and bis(pyrazolyl)acetate ligands†
Abstract
Diazoalkane complexes [Ru(Tp)(N2CAr1Ar2)(PPh3)L]BPh4 (1 and 2) [Tp = tris(pyrazolyl)borate; L = P(OMe)3, P(OEt)3; Ar1 = Ar2 = Ph; Ar1 = Ph, Ar2 = p-tolyl; Ar1Ar2 = C12H8] were prepared by allowing chloro-compounds RuCl(Tp)(PPh3)L to react with diazoalkane in the presence of NaBPh4. Acrylonitrile CH2![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
C(H)CN reacts with diazoalkane complexes to give 3H-pyrazole derivatives [Ru(Tp){NNC(Ar1Ar2)CH(CN)CH2}(PPh3){P(OMe)3}]BPh4 and [Ru(Tp){NNC(Ar1Ar2)CH2C(H)CN}(PPh3){P(OMe)3}]BPh4 (3). Diazoalkane complexes [Ru(bpza)(N2CAr1Ar2)(PPh3)2]BPh4 (4) [bpza = bis(pyrazolyl)acetate] were also prepared. All complexes were characterised by IR and NMR spectroscopy and X-ray crystal structure determination of [Ru(Tp){N2C(Ph)(p-tolyl)}(PPh3){P(OMe)3}]BPh4 (1b). The differences exhibited by [Ru(Tp){N2C(Ph)(p-tolyl)}(PPh3){P(OMe)3}]+ and [Ru(Cp){N2C(Ph)(p-tolyl)}(PPh3){P(OMe)3}]+, as regards coordination of the diazoalkane ligand and reactivity towards alkenes, were explained on the basis of a comparative DFT study.
Please wait while we load your content...
