Cobalt(II) and zinc(II) complexes of thiourea as catalysts for the reactions between carbonyl compounds and anilines

Download
  1. Get@NRC: Cobalt(II) and zinc(II) complexes of thiourea as catalysts for the reactions between carbonyl compounds and anilines (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1016/S0020-1693(00)89114-8
AuthorSearch for: ; Search for: ; Search for:
TypeArticle
Journal titleInorganica Chimica Acta
ISSN0020-1693
Volume61
Pages2531; # of pages: 7
AbstractThe kinetics of the reactions between p-nitro-benzaldehyde and p-toluidine and between acetone and p-anisidine have been examined in non-aqueous solutions and in the presence of Zinc(II) and Cobalt(II) complexes of thiourea which acts as catalysts. The reaction between 2,4-Dinitrophenyl acetate and p-toluidine is not catalysed by these metal complexes. The kinetics of the p-Nitrobenzaldehyde reaction are straight-forward with first order dependence on each of the reactants and on the catalyst and a second order rate determining step. For the reaction in acetonitrile d3 catalysed by tetrakis Zn(II) thiourea perchlorate a third order rate constant of 25.0±1.5 M−2 s−1 has been measured. The kinetics of the acetone/p-anisidine reaction are quite different and closely parallel similar reactions studied previously. The results for the two reactions cannot be fitted to a common mechanism. All three reactions involve nucleophilic attack of an aniline on a carbonyl group but two are catalysed by different mechanisms and the third is not catalysed at all. It is suggested that catalysis can occur either by coordination of the carbonyl compound or by coordination of the adduct formed by the carbonyl compound and the aniline. If neither of these reactants is capable of forming a sufficiently long lived metal complex there will be no catalysis.
Publication date
LanguageEnglish
Peer reviewedYes
NRC publication
This is a non-NRC publication

"Non-NRC publications" are publications authored by NRC employees prior to their employment by NRC.

NPARC number21270190
Export citationExport as RIS
Report a correctionReport a correction
Record identifier45ca1125-680f-4ecc-9823-6320ad22d6a1
Record created2014-01-09
Record modified2016-05-09
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)