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Investigates the mechanism of nucleophilic vinylic substitution reaction. Kinetics of the reactions of methoxybenzylidenemalononitrile; Use of MeO[sub 2]CCH[sub 2]S as thiolate ions; Effect of activating substituents on rate and equilibrium constants.

Examines the kinetic analysis of the acid-catalyzed loss of alkoxide and thiolate ions of Meldrum's acid derivatives. Determination of the pKa values; Identification of proton-transfer rate constants at the alpha-carbon; Calculations of rate constants of nucleophilic; Relationships between structure and reactivity.

Presents information pertaining to a kinetic study which focused on the reaction of a series of thiolate and alkoxide ions with benzylidene Meldrum's acid. Chemical equation of the reaction; What the results showed; Discussion on the similarities and differences between the reactions of thiolate ions with alpha-nitrostilbenes; Performance of all experiments in 50 percent dimethyl-sulphoxide (DMSO)-50 percent water at 20 degrees Celsius.

Looks at a study which examined the kinetics of the methoxybenzylidene Meldrum's acid's nucleophilic vinylic substitution reactions. Details on the thiolate and alkoxide ions; In-depth look at the tetrahedral intermediate process; Methodology used to conduct the study; Results of the study.