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X-ray structure of 3-diphenylmethylene-2-(2,4,6-tri-t-butylphenyl)thiaphosphirane 2-sulfide: The first thiaphosphirane with exo-methylene

✍ Scribed by Ken Hirotsu; Akihiro Okamoto; Kozo Toyota; Masaaki Yoshifuji

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
355 KB
Volume
1
Category
Article
ISSN
1042-7163

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✦ Synopsis

The title compound wasprepared by sulfurization of a I -phosphaallene and its x-ray structure analysis showed the following notable features of the thiaphosphirane ring: P-2 = 2.101(2), P-C = 1.770(5) and S-C = 1.767(5) A (remarkably short), and LSPC = 53.5(2), LPSC = 53.6(2) and LPCS = 72.9(2 >" .

Phosphorus-containing small ring compounds as well as pm-bonded PIII and Pv compounds are of current interest, particularly with respect to their bonding properties and reactivities. Kinetic stabilization with bulky substituents has been applied in many attempts to isolate unstable compounds. Bulky groups are also known to stabilize threemembered heterocyclic compounds with an exocyclic double bond, which are of special interest in view of their ring strain and reactivities [l]. By introducing an extremely bulky 2,4,6-tri-t-butylphenyl group into a molecule as a protecting group, we have been successful in the preparation and characterization of some P=C double-bonded

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