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Issue 2, 1993
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Syntheses and spectral characterizations of tricarbonylchromium complexes of calix[4]arenes

Hideshi Iki,  Taketoshi Kikuchi  and  Seiji Shinkai 

Abstract

The 1:1 arene–tricarbonylchromium complexes were synthesized for the first time from four conformational isomers of 25,26,27,28-tetra propoxycaIix [4]arene (14Pr) and Cr(CO)6. The 1:2, 1:3 and 1:4 complexes of cone-14Pr were also synthesized by increasing the ratio of Cr(CO)6 against cone-14Pr. The 1:2 complex was a mixture of two compounds, which were identified as distal and proximal isomers of cone-14Pr·2Cr(CO)3. The relative stability of the 1:1 complex was estimated via its oxidation by CuCl2. The pseudo-first-order rate constants appeared to be in the order of 1,3-alternate-14Pr > 1,2-alternate-14Pr > cone-14Pr > 2,6-dimethylanisole. The results indicate that the 14Pr·Cr(CO)3 complexes are less stable than the corresponding monomeric complex. The 1:1 complexes with partial-cone-14Pr and 1,2-alternate-14Pr were demonstrated to be a pair of racemates by 1H NMR spectroscopy using a chiral shift reagent (Pirkle's reagent).

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Article type: Paper
DOI: 10.1039/P19930000205
Citation: J. Chem. Soc., Perkin Trans. 1, 1993,0, 205-210
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    Syntheses and spectral characterizations of tricarbonylchromium complexes of calix[4]arenes

    H. Iki, T. Kikuchi and S. Shinkai, J. Chem. Soc., Perkin Trans. 1, 1993, 0, 205
    DOI: 10.1039/P19930000205

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