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Correlations between 31p n.m.r. chemical shifts and structures of some organophosphorus pesticides

โœ Scribed by Ralph T. Ross; Francis J. Biros

Publisher
Elsevier Science
Year
1970
Tongue
English
Weight
281 KB
Volume
52
Category
Article
ISSN
0003-2670

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โœฆ Synopsis

Correlations

between SIP n.m.r. chemical shifts and structures of some organophosphorus pesticides

Several recent publications i--3 have described the usefulness of high-resolution proton magnetic resonance (n.m.r.) for the elucidation of structure of phosphoruscontaining organic compounds used as pesticides. Because phosphorus n.m.r. is playing an ever-increasing role in structure characterization and qualitative identification"Jj of phosphorus compounds, we have examined BiP n.m.r. spectra of a series of organophosphorus pesticidal compounds. Chemical shifts for thirty-seven organophosphorus pesticides have been measured and correlated with the structures of nine classes of these compounds. Empirical correlations describing tile relative effects which the atoms adjacent to phosphorus have on the chemical shifts are given for some of these classes. Tllese correlations between SIP n.m.r. shifts and structure are presented for USC in qualitative prediction.

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## Abstract Significant variations of thiapyrylium chemical shifts, by comparison with their thienohomologues, are shown by ^1^H n.m.r. spectra of furo[3,2โ€c]thiapyrylium and furo[2,3โ€c]thiapyrylium perchlorates. The observed changes can be ascribed to a different distribution of the electron charg