2,2,6,6-Tetramethyl-3,5-bis(2,6-diisopropylphenylimino)heptane at 150 K

The title compound, C35H54N2, crystallizes as the E/Z and E/E isomers. Ther e are two independent molecules in the crystal; the first occupies a genera l position, adopts a non-symmetrical conformation and represents the E/Z is omer with respect to the C=N bonds; the second exhibits exact C-2 symmetry (E/E isomer). The observed bond lengths and disposition of the H atoms in b oth molecules are consistent with a diimine. This contrasts with the relate d compound 2-(2,6-diisopropylphenylamino)-4-(2,6-diisopropylphenylimino)-2- pentene, which crystallizes as the imine-enamine tautomer.