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標題: Preparation and NMR studies of cobalt-containing diphosphine ligand chelated W, Ru, Au and Pd complexes: Suzuki cross-coupling reactions and carbonylation catalyzed by the Pd complex
作者: Hong, F.E.
Chang, Y.C.
Chang, C.P.
Huang, Y.L.
關鍵字: molecular-structures;crystal-structure;organic halides;gold(i);centers;mild conditions;alkyl bromides;chemistry;derivatives;acetylene;aryl
Project: Dalton Transactions
期刊/報告no:: Dalton Transactions, Issue 1, Page(s) 157-165.
Treatment of a cobalt-containing diphosphine ligand, [{mu-P,P-PPh2CH2PPh2} Co-2(CO)(4){mu-PPh2C = CPPh2}] 1 with metal complexes W(CO)(6), Ru-3(CO)(12), AuCl(tht) (tht = tetrahydrothiophene) and (COD) PdCl2 (COD = 1,5-cycloctadiene) gave 1-chelated metal complexes [(1) W(CO)(4)] 3, [(mu-1) Ru-3(CO)(10)] 4, [(1)(AuCl)(2)] 5 and [(1) PdCl2] 6, respectively. All these compounds were characterized by spectroscopic means whereas 3, 4 and 6 were also studied by X-ray diffraction. These compounds display chelating and bridging modes of metal - phosphine complexation. Variable-temperature H-1 and P-31 NMR experiments were carried out for 3 - 6 and revealed that the fluxional behavior of each individual bridging dppm fragment was affected greatly by the bite angle of 1 in each metal complex. Suzuki cross-coupling reactions were satisfactorily catalyzed by 6 under mild conditions. The reactions of aryl halides or iodothiophenes with chloroform and alkali in biphasic solution utilizing a catalytic amount of 6 result into the formation of benzoic and thiophenic acids, respectively.
ISSN: 1477-9226
DOI: 10.1039/b311113j
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