Oligourethan dimers having asymmetric carbon atoms in the main chain. Oligourethans. V1

Abstract

AbstractA series of oligourethan dimers having asymmetric carbon atoms in the main chain was prepared by the reaction between 1‐alkyl‐2‐acetoxyethyl isocyanates and methyl l‐alkyl‐2‐hydroxyethylcarbamates; their melting points, rotatory powers and RF‐values were determined. The dimers prepared are represented by a general formula, magnified image where R and R' are H, methyl (L and DL‐forms), i‐propyl (L and DL), i‐butyl (L and DL) or benzyl (L) groups. Certain relationships have been found between the structure and rotatory power resp. RF‐value.