Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/63333
Type: Artigo de periódico
Title: C-13 NMR CHEMICAL-SHIFT SUBSTITUENT EFFECTS .8. 3-MONOSUBSTITUTED 2-METHYLPROPENES
Author: RITTNER, R
BRAIBANTE, MEF
Abstract: C-13 NMR chemical shifts for some 3-heterosubstituted 2-methylpropenes are reported. The alpha-methylene chemical shifts show excellent linear correlations with the corresponding data for some substituted carbonyl compounds (propanones, methyl acetates and N,N-diethylacetamides). Their estimated intramolecular interaction shifts are indicative of electronic interactions between the heteroatom and the ethylenic double bond. The sp2 carbon shifts calculated by Dorman et al.'s method, taking a proposed set of beta(sigma) and beta(pi) parameters, are in close agreement with the experimental values. Neither the alpha-methylene nor the olefinic carbon chemical shifts correlate well with the usual electronic and steric parameters of the substituents.
Subject: C-13 NMR SPECTRA
SUBSTITUENT EFFECTS
3-SUBSTITUTED 2-METHYLPROPENES
Country: Inglaterra
Editor: John Wiley & Sons Ltd
Rights: fechado
Identifier DOI: 10.1002/mrc.1260300513
Date Issue: 1992
Appears in Collections:Unicamp - Artigos e Outros Documentos

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