Synthesis of the Tantalum Hydride Complex (<i>R,R</i>)-[Ta(O<sub>2</sub>C<sub>20</sub>H<sub>10</sub>{SiMe<sub>3</sub>}<sub>2</sub>-3,3‘)<sub>2</sub>(H)] and Reactivity with Aldehydes, Ketones, Acetylenes, and Related Substrates: A Reagent for the Asymmetric Hydrogenation of Prochiral Carbonyl Species
作者:Charles S. Weinert、Phillip E. Fanwick、Ian P. Rothwell
DOI:10.1021/om050633s
日期:2005.11.1
benzaldehyde-d to give alkoxide complexes that are chiral at the α-carbon. The progress of these reactions was monitored by 13C NMR spectroscopy. An X-ray crystal structure of one of the products (R,R,R)/(R,R,S)-[Ta(O2C20H10SiMe3}2-3,3‘)2(OCHCH3}Ph})(OCCH3}Ph})] was obtained, and the catalytic conversion of benzaldehyde-d to benzyl alcohol-d was carried out using (R,R)-2. The hydride complex also reacts
钽苯基络合物(R,R)-[Ta(O 2 C 20 H 10 SiMe 3 } 2 -3,3')2(Ph)],(R,R)-1是由[H 2 NEt 2 ] [Ta(O 2 C 20 H 10 SiMe 3 } 2 -3,3')2 Cl 2 ],已被用于合成氢化物(R,R)-[Ta(O 2) ç 20 ħ10 SiMe 3 } 2 -3,3')2(H)],(R,R)-2通过与氢化二异丁基铝(DIBAL-H)反应。反应干净且高收率地进行。化合物(R,R)-2与苯乙酮和苯甲醛-d进行清洁反应,生成在α碳上手性的醇盐配合物。这些反应的进程通过13 C NMR光谱监测。(R,R,R)/(R,R,获得S)-[Ta(O 2 C 20 H 10 SiMe 3 } 2 -3,3')2(OCH CH 3 } Ph})(O C CH 3 } Ph}))。苯甲醛-d催化转化为苯甲醇-d的反应是使用(R