2‐tert‐Butylamino‐4‐chloro‐6‐ethylamino‐1,3,5‐triazine: a structure with Z′ = 4 containing two different molecular conformations and two independent chains of hydrogen‐bonded R22(8) rings

The title compound (trivial name terbutylazine), C₉H₁₆ClN₅, (I), crystallizes with Z′ = 4 in the space group Pca2₁, and equal numbers of molecules adopt two different conformations for the ethylamine groups. The four independent molecules form two approximately enantiomorphic pairs. Eight independent N—H...N hydrogen bonds link the molecules into two independent chains of R₂²(8) rings, in which the arrangement of the alkylamine substituents in the independent molecules precludes any further crystallographic symmetry. The significance of this study lies in its finding of two distinct molecular conformations within the structure and two distinct ways in which the molecules are organized into hydrogen‐bonded chains, and in its comparison of the hydrogen‐bonded structure of (I) with those of analogous 1,3,5‐triazines and pyrimidines.