34 THE CHEMICAL CONSTITUTION OF THE PROTEINS 



derivative with methylamine or dimethylamine ; the reaction with the 

 tertiary amine leads to the formation of the corresponding hydroxy 

 derivative of the amino acid. Abderhalden and Kautzsch have, how- 

 ever, obtained the trimethyl derivatives by the direct methylation of 

 the dipeptides, leucyl-glycine and glycyl-glycine. Treatment of chlor- 

 acetyl glycyl-glycine with trimethylamine yielded trimethyl-diglycyl- 

 glycine. Both compounds were isolated as their betaines. 



