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机构地区:[1]上饶师范学院化学化工学院,江西省普通高校应用有机化学重点实验室,上饶334001
出 处:《无机化学学报》2014年第2期459-465,共7页Chinese Journal of Inorganic Chemistry
基 金:国家自然科学基金(No.21261020);江西省高等学校科技落地计划(No.KJLD12094);江西省普通高校重点实验室科研基金(No.GJJ12704)资助项目
摘 要:在DDQ/PPh3作用下,以2-异丙基苯甲酸或水杨酸为原料,在温和条件下以较高的收率合成、分离得到两个化合物(2)和(3)。化合物(2)和(3)与苯胺在氯仿中加热回流可分别转化为酰胺类化合物(4)和(5)。所有化合物通过元素分析、质谱、核磁共振进行了表征,并解析了化合物(2)和(3)的X-衍射单晶结构。化合物1,2-二(2-异丙基苯甲酸)-2,3-二氰-5,6-二氯苯(2)晶体属单斜晶系,空间群P21/c,其晶胞参数为:a=1.287 5(3)nm,b=1.518 6(2)nm,c=1.572 6(3)nm,β=122.23(3)°,V=2.601 0(1)nm3,Dc=1.331 g·cm-3,Z=4,F(000)=1 080,R1=0.057 2,wR2=0.126 0;化合物1,2-二(2-羟基苯甲酸)-2,3-二氰-5,6-二氯苯(3)晶体属三斜晶系,空间群P1,其晶胞参数为:a=0.877 76(16)nm,b=1.131 11(15)nm,c=1.186 39(17)nm,α=69.290(2)°,β=89.409(3)°,γ=67.878(2)°,V=1.010 4(3)nm3,Dc=1.542 g·cm-3,Z=2,F(000)=476,R1=0.038 3,wR2=0.093 1。强π-π堆积作用和分子间氢键将化合物(2)和(3)组装成稳定的三维结构。Treatment of 2-substituted benzoic acids (2-isopropylbenzoic acid and salicylic acid) with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) mediated by PPh3 at room temperature produced two 1,4-disubstituted 2,3-dicyano-5,6-dichlorobenzenes (2 and 3) in good yields. Heating a chloroform solution of 2 and 3 to the reflux temperature in the presence of phenylamine generated amide derivatives 4 and 5, respectively. All the target compounds were fully characterized by elemental analysis, MSand 1H NMRspectrometry, and the structures of compounds 2 and 3 were further confirmed by single-crystal determination. 1,4-Bis(2-isopropylbenzoate)-2,3-dicyano-5,6-dichlorobenzene (2) crystallizes in monoclinic space group P21/c with cell parameters: a=1.2875(3) nm, b=1.5186(2) nm, c=1.5726(3) nm, β=122.23(3)°, V=2.6010(1) nm3, Dc=1.331 g·cm-3, Z=4, F(000)=1080, R1=0.0572, wR2=0.1260. 1,4-Bis(2-hydroxybenzoate)-2,3-dicyano-5,6-dichlorobenzene (3) crystallizes in triclinic space group P1 with cell parameters: a=0.87776(16) nm, b=1.13111(15) nm, c=1.18639(17) nm, α=69.290 (2)°, β=89.409 (3)°, γ=67.878 (2)°, V=1.0104(3) nm3, Dc=1.542 g·cm-3, Z=2, F(000)=476, R1=0.0383, wR2=0.0931. Strong π-π stacking interactions and intermolecular hydrogen bonds of the structures (2 and 3) stabilized the two intermediates. CCDC: 921957, 2; 935976, 3.
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