Decarboxylation syntheses of transition metal organometallics, II. trans-carbonyl(polyhalogenophenyl)bis(triphenylphosphine)rhodium(I) compounds

Glen B. Deacon, Suellen J. Faulks, Jack M. Miller

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The rhodium(I) carboxylates, trans-RhO2CR(CO)(PPh3)2 (R = C6F5, C6Cl5, p-HC6F4, m-HC6F4, o-HC6F4, p-McOC6F4, 4,5-H2C6F3, 3,5-H2C6F3, or 2,6-F2C6H3, have been prepared by reaction of RhH(CO)(PPh3)3 with the appropriate polyhalogenobenzoic acids in ethanol and/or by reaction of trans-RhCl(CO)(PPh3)2 with the appropriate thallous carboxylates in benzene. Decarboxylations with formation of polyhalogenoarylrhodium(I) compounds, trans-RhR(CO)(PPh3)2 (R = C6F5, C6Cl5, p-HC6F4, m-HC6F4, p-MeOC6F4, 4,5-H2C6F3 or 3,5-H2C6F3), have been achieved either by decomposition of the corresponding rhodium(I) carboxylates in pyridine or by reaction of trans-RhCl(CO)(PPh3)2 and the thallous carboxylates in pyridine, but the derivatives R =o-HC6F4 or 2,6-F2C6H3 could not be obtained by this method. The rate of decarboxylation decreased in the sequence R = C6F5 >p-MeOC6F4 >p-HC6F4 >m-HC6F4 > 4,5-H2C6F3 > 3,5-H2C6F3.

Original languageEnglish
Pages (from-to)305-313
Number of pages9
JournalTransition Metal Chemistry
Issue number1
Publication statusPublished - Dec 1980

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