Abstract
WE have found that some of the proton magnetic resonances of the alkyl groups of several types of organophosphorus compounds are doubled. This doubling is in addition to the resonance multiplication that would be predicted from coupling with other magnetic nuclei in these compounds. So far we have observed resonance doubling for three types of structures. Type (I) is exemplified by 2-propylphenylphosphinyl chloride. In compounds of this type, the alkyl group is directly linked to the phosphorus atom. Type (II) is exemplified by di-2-butyl phenylphosphate or di-2-butyl phenylphosphonate. In such compounds the alkyl group is linked through an oxygen atom to the phosphorus atom. Type (III) is exemplified by di-2-propyl phenylphosphonite, in which the phosphorus is trivalent.
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References
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SIDDALL, T., PROHASKA, C. & SHULER, W. Doubling of the Proton Magnetic Resonances of Certain Organophosphorus Compounds. Nature 190, 903–904 (1961). https://doi.org/10.1038/190903a0
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DOI: https://doi.org/10.1038/190903a0
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