The Synthesis and Crystal Structure Determination of Phenyl 2-(3,4-dihydro-1(2H)naphthalenylidine)hydrazinecarboxylate and Phenyl (2,4-dichlorophenyl-methylene)hydrazinecarboxylate

( E )-Phenyl 2-(3,4-dihydro-1(2 H )-naphthalenylidine)hydrazinecarboxylate and ( E )-phenyl (2,4-dichlorophenylmethylene)hydrazinecarboxylate were prepared by the condensation of 1-tetralone or 2,4-dichlorobenzaldehyde with phenyl hydrazinecarboxylate. Crystals of C 17 H 16 N 2 O 2 3 are monoclinic, C 2/ c , a = 17.763(4) Å, b = 8.353(2) Å, c = 40.233(8) Å, Z = 16, V = 5,839(2) Å 3 , R 1 = 0.0448 and wR 2 = 0.1104 for reflections with I > 2σ( I ). Crystals of C 14 H 10 N 2 O 2 Cl 2 5 are orthorhombic, P 2 1 2 1 2 1 , a = 8.288(3) Å, b = 14.082(2) Å, c = 23.788(5) Å, Z = 8, V = 2,777(1) Å 3 , R 1 = 0.0815 and wR 2 = 0.2006 for reflections with I > 2σ( I ). The molecular packing in the crystal for both compounds is the result of N–H···O hydrogen bonding. Index Abstract X-ray crystal analysis was important for the confirmation of the structure of phenyl 2-(3,4-dihydro-1(2 H )-naphthalenylidine)hydrazinecarboxylate and phenyl (2,4-dichlorophenylmethylene)hydrazinecarboxylate that have been prepared by the 1:1 condensation of 1-tetralone or 2,4-dichlorobenzaldehyde with phenyl hydrazinecarboxylate.