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|標題:||Reaction of CpCo(PPh3)(2) with diphenylphosphinoalkynes: Syntheses and X-ray structures of 1,3-cyclobutadiene-substituted CpCoCb diphosphine and 2,5-cobaltacyclopentadiene diphosphine dioxide||作者:||Chang, C.P.
|關鍵字:||Dppf;cobalt-containing phosphine;Suzuki coupling reaction;diphenylphosphinoalkynes;cobaltacyclopentadiene;(eta(5)-cyclopentadienyl)(eta(4)-cyclobutadiene)cobalt;c-o bond;palladium-catalyzed amination;cross-coupling reactions;aryl;chlorides;room-temperature;reductive elimination;phosphine-ligands;general-method;diaryl ethers;complexes||Project:||Journal of Organometallic Chemistry||期刊/報告no：:||Journal of Organometallic Chemistry, Volume 691, Issue 26, Page(s) 5831-5837.||摘要:||
A potentially bidentate cobalt-containing phosphine ligand, [(eta(5)-C5H5)Co(eta(4)-1,3-(PPh2)(2)C4Ph2)] (trans-1), was prepared from the reaction between PhC CPPh2 and CpCo(PPh3)(2) obtained in situ from CoCl(PPh3)(3) and NaCp. The cobaltacycle [(eta(5)-C5H5)(PPh3)Co(2,5-(PPh2)(2)C4H2)] (2) was prepared from the reaction of CpCo(PPh3)(2) with HC CPPh2. An oxidized product [(eta(5)-C5H5)(PPh3)Co(2,5-(P(O)Ph-2)(2)C4H2)] (4), was obtained upon the attempted isolation of 2 using CTLC. Both 2 and 4 failed to produce [(eta(5)-C5H5)Co(eta(4)-1,2-(PPh2)(2)C4H2)] or its oxidized analog, respectively, upon thermal activation. The performance of phosphine 1 in the Suzuki coupling of several aryl chlorides with phenylboronic acid in the presence of Pd(OAc)(2) was evaluated. (c) 2006 Elsevier B.V. All rights reserved.
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