Eslami F, Pourayoubi M, Sabbaghi F, Skořepová E, Dušek M, Baniyaghoob S. Diastereotopic groups in two new single-enanti-omer structures (
R2)P(O)[NH-(+)CH(C
2H
5)(C
6H
5)] (
R = OC
6H
5 and C
6H
5).
Acta Crystallogr E Crystallogr Commun 2023;
79:769-776. [PMID:
37693677 PMCID:
PMC10483558 DOI:
10.1107/s2056989023006278]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 07/19/2023] [Indexed: 09/12/2023]
Abstract
The crystal structures of two single-enanti-omer compounds, i.e. diphenyl [(R)-(+)-α-ethyl-benzyl-amido]-phosphate, C21H22NO3P or (C6H5O)2P(O)[NH-(R)-(+)CH(C2H5)(C6H5)] (I), and N-[(R)-(+)-α-ethyl-benz-yl]-P,P-di-phenyl-phosphinic amide, C21H22NOP or (C6H5)2P(O)[NH-R-(+)CH(C2H5)(C6H5)] (II), were studied. The different environments at the phospho-rus atoms, (O)2P(O)(N) and (C)2P(O)(N), allow the P=O/P-N bond strengths to be compared, as well as the N-H⋯O=P hydrogen-bond strengths, and P=O/N-H vibrations. The following characteristics related to diastereotopic C6H5O/C6H5 groups in I/II were considered: geometry parameters, contributions to the crystal packing, solution 13C/1H NMR chemical shifts, conformations, and NMR coupling constants. The phospho-rus-carbon coupling constants nJ PC (n = 2 and 3) in I and mJ PC (m = 1, 2, 3 and 4) in II were evaluated. For a comparative study, chiral analogous structures were retrieved from the Cambridge Structural Database (CSD) and their geometries and conformations are discussed.
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