Tuning the Nucleophilicity in Cyclopropenylidenes

Definition of a nucleophilicity scale.

This work deals with exploring some empirical scales of nucleophilicity. We have started evaluating the experimental indices of nucleophilicity proposed by Legon and Millen on the basis of the measure of the force constants derived from vibrational frequencies using a probe dipole H-X (X = F,CN). The correlation among some theoretical parameters with this experimental scale has been evaluated. ...

Nucleophilicity of zinc-bound thiolates

The nucleophilicity of biomimetic zinc-thiolate complexes against methyl iodide has been studied. The activation barrier has been computed with the B3LYP functional. The reactivity depends on the global charge, the nature of the ligand set and the presence of hydrogen bonds. This shows that the understanding of zinc site nucleophilicity can not be achieved by the knowledge of the atom donor set...

Nucleophilicity scale for n- and p-nucleophiles

A recently introduced empirical nucleophilicity index for a series of nand p-nucleophiles was evaluated. The index is based on the frontier molecular orbital information of the nucleophile and its electrophilic partner. The model is validated against kinetic data of alkenes, phosphanes, phosphites and amines interacting with the corresponding electrophilic partner. The predictive character of t...

Electrophilicity and nucleophilicity of commonly used aldehydes.

The present approach for determining the electrophilicity (E) and nucleophilicity (N) of aldehydes includes a kinetic study of KMNO4 oxidation and NaBH4 reduction of aldehydes. A transition state analysis of the KMNO4 promoted aldehyde oxidation reaction has been performed, which shows a very good correlation with experimental results. The validity of the experimental method has been tested usi...

Nucleophilicity parameters for alkyl and aryl isocyanides.