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標題: Synthesis and structural characterization of novel palladium complexes chelated by bulky cobalt-containing phosphine ligands: unusual palladium-cobalt bond formation
作者: Hong, F.E.
Chang, C.P.
Chang, Y.C.
關鍵字: cross-coupling reactions;ray crystal-structure;acetylene-dicobaltcarbonyl complexes;mixed-metal clusters;aryl;chlorides;molecular-structures;organometallic complexes;heterodinuclear complex;intermediate complexes;aroylcobalt complexes
Project: Dalton Transactions
期刊/報告no:: Dalton Transactions, Issue 20, Page(s) 3892-3897.
The reaction of a bulky phosphine, [Co-2(CO)(5){mu-P,P-(mu-PPh(2)Cequivalent toCPPh(2))}][Co-2(CO)(4){mu-P-(mu-PPh(2)Cequivalent toCPPh(2))}] 1 with P(OMe)(3) gave a phosphite substituted tetracobalt-complex, [Co-2(CO)(4){P(OMe)(3)}{mu-P,P-(mu-PPh(2)Cequivalent toCPPh(2))}]-[Co-2(CO)(4){mu-P-(mu-PPh(2)Cequivalent toCPPh(2))}] 5. Further reaction of 5 with (COD) PdCl2 yielded a 5-coordinated palladium complex, [Co-2(CO)(4){P(OMe)(3)}}{mu-P,P-(mu-PPh(2)Cequivalent toCPPh(2))}][Co-2(CO)(3)(mu-CO){mu-P-(mu-PPh(2)Cequivalent toCPPh(2))}] PdCl2 7. Similar results were obtained for the reaction of 1 with (COD) PdCl2, which yielded [Co-2(CO)(5){mu-P,P-(mu-Ph(2)Cequivalent toCPPh(2))}][Co-2(CO)(3)(mu-CO){mu-P-(mu-PPh(2)Cequivalent toCPPh(2))}] PdCl2 6. Likewise, reaction of another bulky phosphine [(mu-Ph2PCH2PPh2)Co-2(CO)(4)(mu-PPh(2)Cequivalent toCP(=O)Ph-2)] 3 with (COD)PdCl2 yielded [{mu-P,P-PPh2CH2PPh2}Co-2(CO)(3)-(mu-CO){mu-PPh(2)Cequivalent toCP(=O)Ph-2}]PdCl2 8. The X-ray structural studies of 6, 7 and 8 reveal that unusual palladium cobalt bonds were formed. A Suzuki type reaction employing complexes 6, 7 and 8, as catalysts in the reaction of 2-bromothiophene with boronic acid did not show encouraging signs.
ISSN: 1477-9226
DOI: 10.1039/b306228g
Appears in Collections:化學系所

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