Bhuvan Kumar, N. N. ; Kumara Swamy, K. C. (2007) Synthesis and structures of cis- and trans-bis(allenyl)cylclodiphosph(V)azanes and a bis(allyl)cyclodiphosph(V)azane Polyhedron, 26 (4). pp. 883-890. ISSN 0277-5387
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S02775...
Related URL: http://dx.doi.org/10.1016/j.poly.2006.09.009
Abstract
The bis-(allenyl)phosphoramidates cis-[(H2C=C=CH)(O)P(μ-N-t-Bu)]2 (9), cis- and trans-[(Me2C=C=CH)(O)P(μ-N-t-Bu)]2 (10a,b) and cis- and trans-[((Me)(Et)C=C=CH)(O)P(μ-N-t-Bu)]2 (11a,b) based on a cyclodiphosph(V)azane skeleton have been synthesized by treating cis-[ClP(μ-N-t-Bu)]2 (1) with the respective propargylic alcohol in the presence of triethylamine. The Baylis-Hillman adduct PhCH(OH)C(CO2Me)=CH2 also reacts with 1 to lead to the bis-(allyl)phosphoramidate cis-[((Ph)HC=C(CO2Me)-CH2)(O)P(μ-N-t-Bu)]2 . H2O (13 . H2O). In this case, a 31P NMR study shows that yet another P(V) compound, tentatively assigned the trans-structure, was initially formed. Preliminary calculations suggest that the cis-isomer 10a is slightly more stable than the trans-isomer 10b in the gas phase. The structures of 9, 10a,b and 13 . H2O are confirmed by X-ray crystallography.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Cyclodiphosphazanes; Cis-trans Isomerism; X-ray Structure; Bis-allenylphosphoramide; Allylphosphoramide |
| ID Code: | 29649 |
| Deposited On: | 23 Dec 2010 05:41 |
| Last Modified: | 07 Jun 2011 06:01 |
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