1-Allylpyrazole as a ligand. V. Preparation and characterization of some iron(0) and group VI metal(0) carbonyls.

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概要

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• The 1-allylpyrazole complexes of the general formula Fe(CO)<SUB>3</SUB>L (L=substituted 1-allylpyrazoles) have been prepared by the photochemical reaction of Fe(CO)<SUB>5</SUB> in the presence of 1-allylpyrazoles, and characterized by the IR, <SUP>1</SUP>H-, and <SUP>13</SUP>C-NMR spectroscopies. These complexes show a large decrease of ν(C=C) frequency and <SUP>1</SUP>H-and <SUP>13</SUP>C-NMR upfield shifts of the olefinic nuclei compared with free ligands. The upfield shifts of olefinic <SUP>1</SUP>H-NMR spectra are not influenced by the substituent groups on the pyrazole ring, but, so far as the terminal olefinic protons are concerned, the shifts are distinctively decreased on replacement of the allyl by the 2-methylallyl group. The upfield shifts of <SUP>13</SUP>C-NMR spectra substantially parallel those of <SUP>1</SUP>H-NMR spectra in these complexes. On refluxing Fe(CO)<SUB>3</SUB>L in a hexane solution containing PPh<SUB>3</SUB>, the complex liberates 1-allylpyrazole to give <I>trans</I>-Fe(CO)<SUB>3</SUB>(PPh<SUB>3</SUB>)<SUB>2</SUB> in a small yield. Some new complexes of general formula M(CO)<SUB>4</SUB>L (M=Cr, Mo, or W, L=1-allylpyrazole) have also been prepared for comparison.

• 公益社団法人 日本化学会の論文

著者

• Miyamoto Takeshi

  Department Of Cell Differentiation Sakaguchi Laboratory Of Developmental Biology Keio University Sch

• Fukushima Kazuo

  Department Of Environmental Sciences Faculty Of Science Shinshu University

• Sasaki Yukiyoshi

  Department of Chemistry and The Research Centre for Spectrochemistry, Faculty of Science, The University of Tokyo

• Miyamoto Takeshi

  Department of Chemistry, Faculty of Science, The University of Tokyo

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