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Conformational analysis of 2-thiono-1,3,2-dioxaphosphorinanes

✍ Scribed by J.P. Dutasta; A. Grand; J.B. Robert; M. Taieb

Publisher
Elsevier Science
Year
1974
Tongue
French
Weight
205 KB
Volume
15
Category
Article
ISSN
0040-4039

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✦ Synopsis

In contrast to the numerous studies available concerning the conformation and the I conformational mobility of the 2-oxo-2R-1,3,2-dioxaphosphorinanes , relatively little attention 2 3 has been devoted to the corresponding 2-thiono derivatives

. From an I.R. study , it was shown that for the 2-methyl-2-thiono-1,3,2-dioxaphosphorinane, a dynamic equilibrium of two conformers exists with the amounts of the two species depending on the dielectric permeability of the medium. In the case of the corresponding 2-chloro derivative, there exists essentially one conformational form.

We wish to report here nmr data ('H, 13c 31

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A great deal of effort has been expended in the past decade in nmr studies of the conformation of six-membered rings (l), but six-membered-ring phosphorus heterocycles have received little attention. RMR studies of 5,'j-disubstituted-l,J,2\_dioxaphosphorinanes, Id and II (2,3), and the synthesis of