Publication Date:
2018-03-09
Description:
Deprotonation of the aminophosphanes Ph2PN(H)R 1a - 1h [R= a: tBu, b: 1-adamantyl, c: iPr, d: CPh3, e: Ph, f: 2,4,6-Me3C6H2 (Mes), g: 2,4,6-tBu3C6H2 (Mes*), h: 2,6-iPr2C6H3 (DIPP)], followed by reactions of the phosphanylamide salts Li[Ph2PNR] 2a, 2b, 2g and 2h with the P-chlorophosphaalkene (Me3Si)2C=PCl, and of 2a - 2g with (iPrMe2Si)2C=PCl, gave the isolable P-phosphanylamino phosphaalkenes (Me3Si)2C=PN(R)PPh2 3a, 3b, 3g, and (iPrMe2Si)2C=PN(R)PPh2 4a - 4g. 31P-NMR spectra, supported by X-ray structure determinations, reveal that in compounds 2a, 2b, 3a, and 3b with bulky N-alkyl groups the Si2C=P-N-P skeleton is non-planar (orthogonal conformation), whereas 3g, 3h, and 4g with bulky N-aryl groups exhibit planar conformations of the Si2C=P-N-P skeleton. Solid 3g and 4g exhibit cisoid orientation of the planar C=P-N-C units (planar I) but in solid 3h the transoid rotamer is present (planar II). From 3g, 4d, and 4g mixtures of rotamers were detected in solution by pairs of 31P-NMR patterns (3h: line broadening).
Print ISSN:
0044-2313
Electronic ISSN:
1521-3749
Topics:
Chemistry and Pharmacology
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