R'; the yield increases with the complexity of the organic residue of the acid amide.
In the case of Scenedesmus acutus it is said that the alga is unable to take up nitrogen in the form of a nitrate or ammoniacal salt, and requires some such substance as an amide or a peptone.
Barium amide, Ba(NH 2) 2, is obtained from potassammonium and barium bromide.
Amino-cyclo-heptane (suberylamine) is obtained by the reduction of suberone oxime or by the action of sodium hypobromite on the amide of cycloheptane carboxylic acid.
Like water and the amide bond in peptides, the imidazole ring can act as both a hydrogen bond acceptor and donor.