OPTICAL ROTATORY DISPERSION OF SOME BRIDGED DERIVATIVES OF ALKYLTARTRATES

Abstract (1) Rotatory dispersions in the region from 6708 Å to 4358 Å of diethyl and dimethyl isopropylidene-tartrates, diethyl and dimethyl ethylidenetartrates and diethyl methylene-tartrate, bridged derivatives of alkyltartrates, in which both the hydroxyls are linked with the rest of the carbonyl compounds have been measured, all with no solvent, and shown to be expressed by one term of Drude’s equation. (2) It is pointed out that the absorption bands of the condensation products from ketone are located at about 1750 Å, whereas those of the compounds derived from aldehydes at about 2100 Å, and the relation between these values and the chemical constitution is discussed. (3) Considering the fact that the dispersion ratio α4358⁄α5461 and the characteristic wave length λ0 range from 1.674 to 1.748 and from 1735 Å to 2141 Å respectively, the rotatory dispersion of these compounds is concluded to be very probably simple.