The program OPKINE is presented for the study of reaction mechanisms and multicomponent analysis in dynamic conditions. This program is written in FORTRAN-77 for IBM 30/90 and VAX 8300 computers, and permits the simultaneous evaluation of both rate constants and initial reagent concentrations or, alternatively, rate constants and sensitivities. Up to 20 kinetic curves, with up to 400 points each, can be treated to evaluate up to 40 parameters. Integration of the system of differential equations is performed by means of the Runge-Kutta-Fehlberg method. OPKINE is provided with the Simplex, and modified versions of the Davidon-Fletcher-Powell and GaussNewton-Marquardt optimization methods. A Monte Car10 procedure to search for the seeds is also available. Simulated experiments have been used to check the performances of the program. Complex kinetic mechanisms and mixtures of a large number of analytes can be managed with good results.

The kinetics of the permanganate oxidation of formic acid in aqueous perchloric acid a t 30°C were examined by the spectrophotometric method. The chemical reaction 2Mn0, A BHCOOH + 2H + -2Mn02 + 3C0, + 4H20. appears to proceed via several parallel reactions. The overall rate equation has been obtained by using statistical multilinear regression analysis of the 660 cases studied, and the presence in the rate equation of two new terms in relation to previous studies shows that both permanganate autocatalgtic effects and acid media inhibition must be taken into account when the reaction proceeds at constant ionic strength.

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The kinetics and mechanism of the reaction of triphenylphosphoniocyclopentadienide 1 with tetrac h loro-pbenzoqu i none (c h loranil 2a) to yield 2,3,5tric h loro-6 -(3 -trip henylp hosp horany I idenecyclopenta-l,4-dienyl) -p-benzoquinone 3 in dichloromethane solution are reported. The rate Paper 1/02559G

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