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Isotope effects on 31P nuclear shielding in thiophosphites

✍ Scribed by Michel C. Démarcq; Louis Le Gleut; Bruno G. Van Hemelryck

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
464 KB
Volume
29
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^34^S isotope effect on the chemical shift of P^III^ nuclei in P(SR)~3~ esters [R = Et, (C~12~H~25~)~n~, Ph] is close to 20.6 ppb per P^III^^34^S bond, i.e. 3–4 times larger than for thiolo sulphur atoms in S = P(SR)~3~ or O = P(SR)~3~. A similar behaviour is noted for the P(S)~3~ sites in P~4~S~9~ and P~4~S~3~ and for the downfield triplet of P~4~S~8~, which, accordingly, is assigned to the tri‐coordinate P atoms of this sulphide. ^13^C isotope effects are also reported for trialkyl(aryl) phosphorotrithioites and S,S,S‐phosphorotrithioates.

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