Myristoyl esters of lactose.

Whereas lactose did not undergo a base-catalyzed transesterification with methyl esters of fatty acids, methyl beta-lactoside reacted under identical conditions to give mono- and di-myristates. This difference in behavior is explained in terms of the formation of an unreactive, internally chelated potassium-lactose complex. Supporting evidence for this hypothesis is the observed change in the anomeric equilibrium of lactose in the presence of potassium carbonate. The monomyristates of methyl beta-lactoside were assigned the structures of 3' and 6' derivatives, and it is concluded that the diesters are the 3',6', and 6,6' derivatives.

Isolation and Characterization of the Major Anthraquinone Pigments from Rumex abysinica.

Emodin, chrysophanol and physcion have been shown to be the major anthraquinone pigments present in the dry roots of RUMEX ABYSINICA.