Coupling of alkynes promoted by Ru(CO)3(PPh3)2 and carbon dioxide:: syntheses and structures of (η4-C4R2R2′CO) Ru(CO)2(PPh3) (R = R′ = Ph; R = Ph, R′ = CCPh) and {Ph2C4(CCPh)2}Ru(CO)(PPh3)2

被引：23

作者：

Yamazaki, S

Taira, Z

机构：

[1] Kochi Gakuen Coll, Chem Lab, Kochi 780, Japan

[2] Tokushima Bunri Univ, Fac Pharmaceut Sci, Yamashiro, Tokushima 770, Japan

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 1999年 / 578卷 / 1-2期

关键词：

alkyne dimerization; diethynylated cyclopentadienone; diethynylated cyclobutadiene; reductive disproportionation of carbon dioxide; synthesis; crystal structures;

D O I：

10.1016/S0022-328X(98)01104-8

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Dimerization of alkyne by Ru(CO)(3)(PPh3)(2) proceeded under carbon dioxide in refluxing toluene or C6H5 to afford a cyclopentadienone Ru(0) complex (R2C4R2'Co)Ru(Co)(2)(PPh3) (R = R' = Ph; R = Ph, R' = -C=CPh) and cyclobutadiene Ru(0) complex (R2C4R2')Ru(CO)(2)(PPh3) (R = Ph, RI = -C=CPh) in moderate yields, each compound being formed as mixtures of isomers, 2, band 3,4-diethynylated cyclobutadiene-l-one and 1,2-and 1,3-diethynylated cyclobutadiene, from MS, IR, C-13-, P-31-NMR and X-ray analyses. At higher temperatures, a carbonate Ru(II) complex Ru(CO3)(CO)(2)(PPh3)(2) was also obtained in 85% yield from the reaction in presence of diphenylacetylene. A cationic Ru(II) species supplied by (CO + CO32-) formed via a reductive disproportionation of CO2 is proposed as an intermediate in an earlier stage of the coupling reactions of the alkyne molecules. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：61 / 67

页数：7

共 21 条

[11] REACTIONS OF COORDINATED LIGANDS .42. THE SYNTHESIS AND REACTIONS OF CATIONIC ETA-4-TETRAPHENYLCYCLOBUTADIENERUTHENIUM COMPLEXES - X-RAY CRYSTAL-STRUCTURES OF [RU(NCME)(ETA-4-C4PH4)(ETA-C5H5)][BF4] AND [RU(ETA-5-CH(PH)C(PH)C(PH)C(PH)O)(ETA-C5H5)] [J].