Ring-opening of epoxides promoted by organomolybdenum complexes of the type [η5-C5H4R)mo(CO)2(773-C3H5)] and [(η5-C5H5) Mo(CO)3(CH2R)]

被引:12
|
作者
Bruno, Sofia M. [1 ]
Gomes, Ana C. [1 ]
Abrantes, Marta [2 ]
Valente, Anabela A. [1 ]
Pillinger, Martyn [1 ]
Goncalves, Isabel S. [1 ]
机构
[1] Univ Aveiro, CICECO Aveiro Inst Mat, Dept Chem, P-3810193 Aveiro, Portugal
[2] Univ Lisbon, Inst Super Tecn, Ctr Quim Estrutural, P-1049001 Lisbon, Portugal
关键词
Molybdenum carbonyl complexes; Acid catalysis; Epoxides; Ring-opening reactions; Isomerization; Alchoholysis; ALPHA-PINENE OXIDE; ACID CATALYST; LEWIS-ACIDS; ISOMERIZATION; MOLYBDENUM(II); ALCOHOLYSIS; CHEMISTRY;
D O I
10.1016/j.jorganchem.2015.09.022
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The cyclopentadienyl molybdenum carbonyl complexes [(775-05H(4)R)Mo(CO)(2)(773-C3H5) and [(eta(5)-C5H5) Mo(CO)(3)(CH2R)] (R = H, COOH) have been shown to promote acid-catalysed reactions in liquid phase, under moderate conditions. The catalytic alcoholysis of styrene oxide with ethanol at 35 degrees C gave 2ethoxy-2-phenylethanol in 100% yield within 30 min for the dicarbonyl complexes and 3-6 h for the tricarbonyl complexes. Steady catalytic performances were observed in consecutive runs with the same catalytic solution, suggesting fairly good catalytic stability. In the second acid-catalysed reaction studied, the isomerization of a-pinene oxide at 55 degrees C gave campholenic aldehyde and trans-carveol in a total yield of up to 86% at 100% conversion. Chemoselectivity is shown to be solvent dependent. (C) 2015 Elsevier BY. All rights reserved.
引用
收藏
页码:179 / 183
页数:5
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