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The Kerr constants of 4-and 5-phenyl-1,3-dioxanes and the conformations of their phenyl groups

✍ Scribed by V. E. Kataev; S. G. Vul'fson; A. N. Vereshchagin; Marc Anteunis; Dirk Tavernier; Noël Hosten

Publisher
Wiley (John Wiley & Sons)
Year
2010
Weight
414 KB
Volume
85
Category
Article
ISSN
0037-9646

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✦ Synopsis

Abstract

The molar Kerr constants and the dipole moments of r‐2‐cis‐5‐dimethyl‐trans‐5‐ø‐1,3‐dioxane (1), r;‐2‐trans‐5‐dimethyl‐cis‐5‐ø‐1,3‐dioxane (2), 2‐methyl‐5,5‐di‐ø‐1,3‐dioxane (3), cis‐2‐methyl‐4‐ø‐1,3‐dioxane (4)‐2‐cis‐6‐dimethyl‐cis‐4‐ø‐1,3‐dioxane (5), r‐2‐cis‐6‐dimethyl‐trans‐4‐ø‐1,3‐dioxane (6) have been obtained in CCl~4~ at 20°C. The molecular anisotropy of 3, evaluated from the light‐scattered measurements, has also been obtained. The rotation angles of the phenyl groups with respect to the C~sp~2‐C‐H plane or the C~sp~2‐C‐CH~3~ plane have been determined by the comparison of the observed molar Kerr constants with those calculated for various conformations; these values emerge as (2): 60°; (3): ø‐eq. 70°, ø‐ax. 15° or ø‐eq.80°, ø‐ax.−10°; (4) and (5): 25°; (6): 60° (turning towards the oxygen atom of the dioxane cycle).

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