Syntheses and spectral characterizations of tricarbonylchromium complexes of calix[4]arenes

Hideshi Iki, Taketoshi Kikuchi, Seiji Shinkai

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Abstract

The 1:1 arene-tricarbonylchromium complexes were synthesized for the first time from four conformational isomers of 25,26,27,28-tetrapropoxycalix[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-1 4Pr 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).

Original languageEnglish
Pages (from-to)205-210
Number of pages6
JournalJournal of the Chemical Society, Perkin Transactions 1
Issue number2
Publication statusPublished - Dec 1 1993

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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