The racemic title compound, C17H23N3O3, isolated from the reaction of L-(−)-tyrosine hydrazide with triethyl orthopropionate in the presence of a catalytic quantity ofp-toluenesulfonic acid (p-TsOH), crystallizes withZ′ = 1 in a centrosymmetric monoclinic unit cell. The molecule contains two planar fragments,viz.the benzene and imidazole rings, linked by two C—C single bonds. The dihedral angle between the two planes is 59.54 (5)° and the molecule adopts a synclinal conformation. The HOMA (harmonic oscillator model of aromaticity) index, calculated for the benzene ring, demonstrates no substantial interaction between the two π-electron delocalization regions in the molecule. In the crystal structure, there is an O—H...N hydrogen bond that links the molecules along thecaxis.
在
对甲苯磺酸(p-TsOH)催化下,L-(-)-
酪氨酸酰
肼与
原丙酸三乙酯反应分离出外消旋标题化合物
C17H23N3O3,在中心对称单斜晶胞中以 Z′ = 1 结晶。分子包含两个平面片段,即苯环和
咪唑环,由两个 C-C 单键连接。两个平面之间的二面角为 59.54 (5)°,分子呈合轴构象。为苯环计算的 HOMA(芳香性谐振子模型)指数表明,分子中的两个 π 电子脱ocalization 区域之间没有实质性的相互作用。在晶体结构中,有一个 O-H...N 氢键将分子沿轴向连接起来。