Chemistry of di- and tri-metal complexes with bridging carbene or carbyne ligands. Part 6. Synthesis of platinum–chromium and –tungsten compounds. X-Ray crystal structure of [(Me₃P)(OC)₄W{µ-C(OMe)C₆H₄Me-4}Pt(PMe₃)₂]

Chemistry of di- and tri-metal complexes with bridging carbene or carbyne ligands. Part 21. Reactivity of µ-(methoxy-p-tolylmethylene) and µ-(p-tolylmethylidyne) groups at a platinum–tungsten centre. X-Ray crystal structure of [PtW{µ-C(OMe)C6H4Me-4}(µ-Ph2PCH2PPh2)(CO)5]

“…spectrum showed the characteristic resonance for a bridging tolylmethylidyne group at 6 387.0 p.p.m., this signal appearing as a doublet [J(PC) 51 Hz] with lv5Pt satellite peaks [J(PtC) 806 Hz]. The corresponding data for the neutral complex [ P ~W ( ~J -C R ) ( C O ) ~( P M ~~) ~( ~-C , H ~) ] are 6 338 p.p.ni., doublet with J(PC) 61 and J(PtC) 732 Hz.Is The 31P-{1H) and 195Pt-{IH; spectra (Table 3) are also consistent with the structure proposed for ( 5 ) . Two sets of signals are seen in the 31P-{'H} spectrum, assignable to PPt and PW groups on the basis of the observed lu5Pt and Ia3W satellite peaks.…”

“…Compound ( I ) reacts with BBr, to give the bromotungsten complex (6), but the latter is produced in better yield by treating ( 5 ) with NEt,Br. The presence of the p-CR group in (6) is established by the 13C-('H) n.m.r.…”

“…Formation of compound (6) from ( I ) with BBr3 probably involves co-ordination of the boron trihalide to the OMe group of ( I 1, followed by transfer of Br to tungsten with loss of BBr,(OMe) and CO. The reaction is reminiscent of the syntheses of bromo(a1kylidyne)tetracarbonyltungsten complexes from the monotungsten compound [W{=C(OMe)R 1- (CO),] and BBr3.I6 The synthesis of ( 6) from (5) presumably involves direct displacement of CO on tungsten with Br-.…”

“…The salt ( 5 ) reacts with sodium methoxide in methanol to regenerate (I), and with the reagents LiMe, K[BH(CHMeEt),], LiC-CBu', and NaSC6H4Me-4 in tetrahydrofuran (t hf) to afford complexes (7)-( lo), respectively, data for which are given in Tables 1-3. All the spectroscopic properties are in accord with the structures proposed.…”

A history of the Chemistry Department, University of Cape Town

“…Gray (Caltech), Herman Desseyn (Antwerp), Orville Thomas (Salford) and Sergei Gubin (Moscow). The research activities of Moss (organometallic chemistry;Howard et al, 1981;Moss et al, 1985;Moss & Mapolie, 1988;Finch et al, 1989;Domingo et al, 1993;Andersen, & Moss, 1995;Gafoor et al, 1996;Hearshaw et al,1999;Hill et al, 2000), Jackson (bioorganic chemistry;Jackson et al, 1981;Jackson & Cosgrove, 1982;Jackson & Kelly, 1983Jackson, 1985;Jackson &Voyi, 1987) and Thornton (vibrational spectroscopy;Hutton & Thornton, 1978;Foulds & Thornton, 1983;Thornton, 1984Thornton, , 1989Thornton, , 1990a have been prodigious. Thornton received the DSc degree from UCT in 1982, and both Moss, an intrepid yachtsman and mountaineer, and the versatile Jackson, are now professors.…”