4, 4-位に同じ置換基をもつα, α-ジメチルスチルベンの幾何異性体の合成と2, 3の性質

概要

論文の詳細を見る
The pairs of geometrical isomers of 4, 4′-dichloro-(1), 4, 4′-dibromo-(2), 4, 4′- diiodo-(3), 4, 4′-dimethyl-(4), and 4, 4′-dimethoxy-(5)-α, α′-dimethylstilbene were prepared from the hydrazones of the corresponding 4-substituted acetophenones by Vargha and Kovácss method. These compounds were converted into they corresponding geometrical isomers by the action of iodine in boiling nitrobenzene. The geometrical configurations of compounds (1) to (4) were determined by the dipole moment or the X-ray diffraction measurement, and that of compound (5) was inferred from the ultraviolet measurement. The spatial configurations thus assigned are in agreement with those deduced from the general rule for the geometrical isomerism of stilbenes that the trans- form has a higher melting point and is less soluble than the cis-form.
社団法人有機合成化学協会の論文