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Keywords = C- and N-chlorophosphorylated enamines

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40 pages, 14340 KB  
Review
C- and N-Phosphorylated Enamines—An Avenue to Heterocycles: NMR Spectroscopy
by Lyudmila Larina
Int. J. Mol. Sci. 2023, 24(11), 9646; https://doi.org/10.3390/ijms24119646 - 1 Jun 2023
Cited by 2 | Viewed by 2926
Abstract
The review presents extensive data (from the works of the author and literature) on the structure of C- and N-chlorophosphorylated enamines and the related heterocycles obtained by multipulse multinuclear 1H, 13C, and 31P NMR spectroscopy. The use of [...] Read more.
The review presents extensive data (from the works of the author and literature) on the structure of C- and N-chlorophosphorylated enamines and the related heterocycles obtained by multipulse multinuclear 1H, 13C, and 31P NMR spectroscopy. The use of phosphorus pentachloride as a phosphorylating agent for functional enamines enables the synthesis of various C- and N-phosphorylated products that are heterocyclized to form various promising nitrogen- and phosphorus-containing heterocyclic systems. 31P NMR spectroscopy is the most convenient, reliable and unambiguous method for the study and identification of organophosphorus compounds with different coordination numbers of the phosphorus atom, as well as for the determination of their Z- and E-isomeric forms. An alteration of the coordination number of the phosphorus atom in the phosphorylated compounds from 3 to 6 leads to a drastic screening of the 31P nucleus from about +200 to −300 ppm. The unique structural features of nitrogen–phosphorus-containing heterocyclic compounds are discussed. Full article
(This article belongs to the Special Issue NMR Spectroscopy in Materials Chemistry)
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