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The conformational, preference of the SO bond of thiane-3-one 1-oxide and of 1,3-dithiane-5-one 1-oxide

✍ Scribed by Knut Bergesen; Brian M. Carden; Michael J. Cook

Publisher
Elsevier Science
Year
1975
Tongue
French
Weight
129 KB
Volume
16
Category
Article
ISSN
0040-4039

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✦ Synopsis

Recent studies have shown that the conformational preferenceof the S-0 bond in six membered ring sulphoxdes varies somewhat unpredictably with the atom or group 1n the p-posltlon. Thus thiane l-oxide 1 exists predominantly as

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A remarkable difference in the conformational preference of the so-bond in 1,3-di-thiane-1-oxides and 1,3-oxathiane-3-oxides.
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The sulfoxide group shows a lot of interesting stereochemical features (2). In thiane-l-oxide the axial conformation (62% of the mixture at -9OOC) is favored by 175 Cal/mole (2). Introduction of a 3,3-dimethyl grouping reverses this axial

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On the NMR spectrum of 1,3-oxathiane-3-oxide: A contrast between the conformational preference of the sulphinyl oxygen in 1,3-oxathiane-3-oxide and in 1,3-dithiane-1-oxides
✍ Knut Bergesen; Michael J. Cook; Alan P. Tonge 📂 Article 📅 1974 🏛 John Wiley and Sons 🌐 English ⚖ 182 KB

## Abstract The 100 MHz spectrum of 1,3‐oxathiane‐3‐oxide is reported. Parameters obtained from first order analyses are interpreted in terms of an absence of a conformational preference of the SO bond at 38°C, but an axial preference at low temperatures. The behaviour contrasts with that found pr

ChemInform Abstract: One-Step Preparatio
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✍ M. CLOSA; P. DE MARCH; M. FIGUEREDO; J. FONT 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 30 KB 👁 2 views

One-Step Preparation and 1,3-Dipolar Cycloadditions of (S)-5-Hydroxymethyl-1-pyrroline N-Oxide. -A straightforward methodology is developed via title compound (II) which allows the preparation of synthetically useful intermediates. -(CLOSA, M.;

A theoretical study on the conformation
A theoretical study on the conformation of 3-phosphinoxido- and 3-phosphono-1,2,3,4,5,6-hexahydrophosphinine 1-oxides
✍ Tamás Körtvélyesi; Melinda Sipos; György Keglevich 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 131 KB 👁 1 views

The title compounds (2 and 4) obtained by the diastereoselective hydrogenation of the corresponding 1,2,3,6-tetrahydrophosphinine oxides (1 and 3) were subjected to a detailed quantum chemical study. The possible chair conformers were calculated at the HF/6-31G \* level of theory, according to which