A thorough understanding of reaction thermochemistry is essential in order to distinguish between mechanistic possibilities. In the gas phase, thermodynamic relationships between molecules, radicals, and 283-285.

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The oxidation chemistry of the organometallic hydride complexes (rj5-C5H5)M(CO)3H (M = Cr, 1; Mo, 2; W, 3), (t)5-C5Me5)Mo(CO)3H (4), and (7i5-C5H5)W(CO)2(PMe3)H ( 5) has been investigated in acetonitrile solution by electrochemical and other methods. The thermodynamic acidities of the cation radicals of 1-5 have been estimated by the use of a thermochemical cycle based on the oxidation potentials of 1-5 and their conjugate bases (anions) as well as the solution pATa values of 1-5.

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