作者:Sanjeev Goswami、Vivek K. Gupta、B. D. Gupta、K. Sivakumar
DOI:10.1007/s10870-005-9031-y
日期:2006.1
The title compound, 5,7-diallyloxy-4-methyl-2H-[1]-benzopyran-2-one, (C16H16O4), was prepared by condensation of ethyl acetoacetate with phloroglucinol followed by allylation of the 5,7-dihydroxy-4-methylcoumarin thus obtained. The compound crystallizes into monoclinic space group P21/c with unit cell parameters a = 7.531(1) Å, b = 22.596(4) Å, c = 8.090(1) Å, β = 92.74(2)°, Z = 4. The crystal structure was solved by direct methods using single crystal X-ray diffraction data and refined to R = 0.0596 for 2166 observed reflections. The coumarin moiety is perfectly planar, with dihedral angle between the two fused rings of 0.46(5)°. The two allyloxy groups have different behaviour, one of them being disordered. Molecules form chains of weak C–H $$ \cdots$$ O and C–H $$ \cdots$$ π hydrogen bonds.
标题化合物 5,7-二烯丙基氧基-4-甲基-2H-[1]-苯并吡喃-2-酮 (C16H16O4) 是通过乙酰乙酸乙酯与氯代葡萄糖醇缩合,然后对由此得到的 5,7-二羟基-4-甲基香豆素进行烯丙基化而制备的。该化合物结晶为单斜空间群 P21/c,单胞参数 a = 7.531(1) 埃,b = 22.596(4) 埃,c = 8.090(1) 埃,β = 92.74(2)°,Z = 4。利用单晶 X 射线衍射数据,通过直接方法求解了晶体结构,并对 2166 个观察到的反射进行了细化,得出 R = 0.0596。香豆素分子是完全平面的,两个融合环之间的二面角为 0.46(5)°。两个烯丙氧基具有不同的行为,其中一个是无序的。分子形成弱的 C-H $ \cdots$$ O 和 C-H $ \cdots$$ π 氢键链。