Bis(2,4-pentanedionato)phenylchromium(III). Preparation and reactions with organic carbonyl compounds and alcohols.
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概要
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A phenylchromium complex CrPh(acac)<SUB>2</SUB> (<B>1</B>) (acac=2,4-pentanedionato ligand) was prepared from Cr(acac)<SUB>3</SUB> and AlPh<SUB>3</SUB>·Et<SUB>2</SUB>O. Complex <B>1</B> reacts with acetone to give benzene, 2-phenyl-2-propanol, and mesityl oxide and is converted into a hydroxo complex [Cr(OH)(acac)<SUB>2</SUB>]<SUB>2</SUB>. The mechanism involving the insertion of the carbonyl group of acetone into the Ph–Cr bond giving an alkoxo intermediate is proposed. Reactions of <B>1</B> with esters proceed similarly to give diphenylmethanol derivatives and alkoxochromium complexes. Complex <B>1</B> reacts with ROH to give benzene and alkoxo complexes [Cr(OR)(acac)<SUB>2</SUB>]<I><SUB>n</SUB></I> [<I>n</I>=1 or 2) which were characterized by means of IR spectra, elemental analyses, molecular weight measurements, magnetic susceptibilities, and chemical reactions. The reactions of <B>1</B> with β-dicarbonyl compounds yield corresponding mixed chelate complexes Cr(β-dic)(acac)<SUB>2</SUB>, where β-dic=diethyl malonato and 1-ethoxy-1,3-butanedionato ligands.
- 公益社団法人 日本化学会の論文
著者
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Ito Takashi
Research Institute for Nanodevice and Bio Systems, Hiroshima University, Higashihiroshima, Hiroshima 739-8527, Japan
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Yamamoto Akio
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Ono Tsukasa
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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Maruyama Kazunori
Research Laboratory of Resources Utilization, Tokyo Institute of Technology
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