N,N′-Dimethylbenzamidine and derivatives: Preparations, structures, and hydrogen bond networks therein

Reported herein are the syntheses of N,N′-dimethylbenzamidine (HDMBA, 1) and its phenyl substituted derivatives HYDMBA with phenyl substituents Y as 3-CH3O (2), and 3-CF3 (3), and the determination of single crystal structures of compounds 1–3. In addition, the crystal structures of the salts of 1 with HBF4 (1a), oxalic acid (1b), terephthalic acid (1c), and 2 with HCl (2d) are also reported. Interesting configurations and H-bonding patterns due to the orientation of two methyl groups were observed.