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A comparative AM1 and ab initio study of the intramolecular proton transfer in tautomeric organic compounds

✍ Scribed by Uko Maran; Mati Karelson; Alan R. Katritzky

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
513 KB
Volume
60
Category
Article
ISSN
0020-7608

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✦ Synopsis

The proton-transfer barriers along the intramolecular hydrogen bond in a series of substituted salicylaldehyde anils were calculated using the AM1 SCF semiempirical method. The reliability of this method for the calculation of proton-transfer barriers was analyzed by the comparison of AM1 barriers for a series of different tautomeric organic compounds with those calculated using ab initio SCF and second-order perturbation theory with extended basis sets. In general, the AM1 method systematically overestimates the barrier height. However, this error is approximately constant for given pairs of groups involved in the intramolecular proton transfer.

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