Zinc Dialkyldithiophosphate Oxidation by Cumene Hydroperoxide: Kinetic Studies by Raman and 31P NMR Spectroscopy

The oxidation of zinc dialkyldithiophosphates (ZDDPs) by cumene hydroperoxide in cyclohexane is studied by Raman and 31 P NMR spectroscopy. The reaction proceeds in two main stages: oxidation of ZDDP to basic ZDDP, and oxidation of basic ZDDP to other products. Observation of phosphorus-containing r...

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Bibliographic Details
Published in:Tribology transactions 1990-01, Vol.33 (1), p.15-20
Main Authors: Paddy, J. L., Lee, N. C. J., Waters, D. N., Trott, W.
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
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Summary:The oxidation of zinc dialkyldithiophosphates (ZDDPs) by cumene hydroperoxide in cyclohexane is studied by Raman and 31 P NMR spectroscopy. The reaction proceeds in two main stages: oxidation of ZDDP to basic ZDDP, and oxidation of basic ZDDP to other products. Observation of phosphorus-containing reaction products by the two techniques yields approximate rate coefficients for the two stages. 31 P NMR spectra of the basic ZDDP peak at high resolution gives evidence of the progressive break up of this cluster molecule, by loss of (RO) 2 PS 2 coordinating groups, as the oxidation proceeds.
ISSN:1040-2004
1547-397X
DOI:10.1080/10402009008981924