作者:Gary L. Williams、Christopher M. Parks、C. Robert Smith、Harry Adams、Anthony Haynes、Anthony J. H. M. Meijer、Glenn J. Sunley、Sander Gaemers
DOI:10.1021/om2006968
日期:2011.11.28
presence of donor ligands (L = MeCN, CO) gives the cationic acetyl species [Rh(xantphos)(COMe)I(L)]+, whereas in CH2Cl2 migratory CO deinsertion gives [Rh(xantphos)(Me)I(CO)]+ (4), which reacts with H2 to liberate methane, as observed in catalytic reactions using syngas. A number of Rh(I) xantphos complexes have been synthesized and characterized. Oxidative addition of methyl iodide to the cation [Rh(xantphos)(CO)]+
用黄嘌呤配体改性的铑/碘化物催化剂对于使用纯CO或CO / H 2将甲醇均匀羰基化为乙酸具有活性。来自催化反应的残余物包含Rh(III)乙酰基络合物[Rh(xantphos)(COMe)I 2 ](1),将其分离并进行晶体学表征。在XANTPHOS配体1采用了“夹钳”κ 3 -P,O,P配位模式与所述呫吨氧气供体的反式的乙酰配体。在[Rh(CO)2 I] 2的温和条件下也合成了相同的产物。1的碘化物抽象在给体配体(L = MeCN,CO)存在下产生阳离子乙酰基物质[Rh(xantphos)(COMe)I(L)] +,而在CH 2 Cl 2中迁移CO插入可得到[Rh(xantphos)(Me (I)(CO)] +(4),它与H 2反应释放出甲烷,这在使用合成气的催化反应中已观察到。已经合成并表征了许多Rh(I)xantphos配合物。甲基碘在阳离子[Rh(xantphos)(CO)] +上的