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| 題名: | Chelate and trans effect of P,O donor phosphine ligands on rhodium catalyzed carbonylation of methanol |
| 作者: | 戴帕克;Dutta, Dipak Kumar;Deb, Biswajit;Hua, Guoxiong;Woollins, J. Derek |
| 貢獻者: | 資訊電機學院電機工程學系 |
| 關鍵詞: | Carbonyl complex;Carbonylation;Catalysis;catalytic activity;chemical structure;Chemistry;Exact sciences and technology;General and physical chemistry;mass spectrometry;methanol;methyl iodide;nuclear magnetic resonance spectroscopy;Oxidative addition;Phosphine;Rhodium;Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry;X-ray diffraction |
| 日期: | 2012-02-01 |
| 上傳時間: | 2026-04-23 13:39:04 (UTC+8) |
| 出版者: | Elsevier BV;Amsterdam: Elsevier B.V |
| 摘要: | 摘要： [Display omitted] ▶ Synthesis of rhodium carbonyl complexes of P,O donor ortho-substituted triphenylphosphine ligands. ▶ Oxidative addition of CH 3I to square planar Rh(I) complexes. ▶ Kinetic studies for the oxidative addition reactions of CH 3I. ▶ Carbonylation of methanol to acetic acid and methyl acetate. ▶ The highest Turn Over Frequency is 1808 h −1. Four complexes of the type [Rh(CO)Cl( η 2- P,O-L)]( 1a,1b) and [Rh(CO)Cl( η 1 -P-L) 2]( 2a,2b), where L = Ph 2PC 6H 4-2-OCH 3( a) and Ph 2PC 6H 4-2-CH 2OCH 3( b), have been synthesized by the reaction of [Rh(CO) 2Cl] 2 with appropriate mol equivalents of the ligands in CH 2Cl 2. The complexes show single intense ν(CO) bands in the range 1965–1989 cm −1 indicating the presence of terminal carbonyl groups. All the complexes have been characterized by elemental analyses, mass spectrometry, IR and multinuclear NMR ( 1H, 31P and 13C) spectroscopy, and the molecular structure of the ligand b is determined by single crystal X-ray diffraction. The complexes undergo oxidative addition ( OA) with excess CH 3I to afford Rh(III)-acyl complexes of the type [RhCl(COCH 3)I(L)]( 3a,3b) and [RhCl(COCH 3)I(L) 2]( 4a, 4b). The kinetic data for the OA reactions with CH 3I indicate a first order reaction and also exhibit that the rate of OA for the chelate complexes ( 1a and 1b) is higher than those of trans-complexes ( 2a and 2b). The catalytic efficiencies of 1a, 1b, 2a and 2b in carbonylation of methanol exhibit higher Turn Over Frequency (TOF) 689–1808 h −1 than the well-known Monsanto's species [Rh(CO) 2I 2] − (TOF = 464–1000 h −1) under similar experimental conditions. The catalytic activities vary in the order as 1a > 1b > 2a > 2b.
出版者： Amsterdam: Elsevier B.V
出版日期： 2012-02-01
出處： Journal of molecular catalysis. A, Chemical, 2012-02, Vol.353, p.7-12
版權： 2011 Elsevier B.V.
版權： 2015 INIST-CNRS
識別號： ISSN: 1381-1169
識別號： EISSN: 1873-314X
識別號： DOI: 10.1016/j.molcata.2011.10.023 |
| 顯示於類別: | [電機工程學系] 期刊論文
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