The title compound 2-amino-4-（4-hydroxy-3,5-dimethoxyphenyl）-5-methyl-6- phenyl nicotinonitrile, C21H19N3O3, was synthesized via four-component reactions between propiophenone, malononitrile, syringaldehyde and ammo...The title compound 2-amino-4-（4-hydroxy-3,5-dimethoxyphenyl）-5-methyl-6- phenyl nicotinonitrile, C21H19N3O3, was synthesized via four-component reactions between propiophenone, malononitrile, syringaldehyde and ammonium acetate in ethanol under reflux without catalyst and characterized by IR, 1H NMR, 13C NMR, MS, EA and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis shows that the compound is of monoclinic system, space group P21/n with a = 8.4600（17）, b = 17.139（3）, c = 13.408（3） A, β= 107.06（3）°, V= 1858.6（6） A3, Z = 4, Mr = 361.39, F（000） = 760, μ（MoKa） = 0.088 mm^-1 Dc = 1.292 g/cm3, 2 = 0.71073 A, the final R = 0.0751 and wR = 0.0938 for 3333 observed reflections with I〉 2σ（I）. The crystal packing of the title compound is stabilized by intermolecular hydrogen bonds.展开更多
《列子·天瑞》里说,札国有个人,担心天要坍塌下来他将无处存身,因此愁得觉也睡不着,饭也吃不下。后人就用“札人忧天”比喻不必要的或无根据的忧虑。 臭氧这篇文章读后真让人们去“忧天”了！国人惯说“天塌下来”,看来,天是塌不...《列子·天瑞》里说,札国有个人,担心天要坍塌下来他将无处存身,因此愁得觉也睡不着,饭也吃不下。后人就用“札人忧天”比喻不必要的或无根据的忧虑。 臭氧这篇文章读后真让人们去“忧天”了！国人惯说“天塌下来”,看来,天是塌不下来的,但是,天上出现了伤及人类的“臭氧洞”: Scientists say a decrease in ozone and an increase in the harmful radiation willcause many more cases of skin cancer and will harm crops,animals and fish. 本文是美国之音的广播稿,从文中知道,成文的时间是1989年。但是,此文现在还在广播,究其原因,大概是本文深入浅出地向读者(听众)交代了关于臭氧的基本知识。 比如,什么是臭氧? Ozone is a three—atom form of oxygen gas. 臭氧的利弊? It is found both in the air we breathe and in the upper atmosphere.atmosphere Near theEarth,ozone in the air is a danger to life.It is a pollutant.But ozone found 10kilometers to 50 kilometers up in the atmosphere protects life on Earth. 臭氧洞及其发现的时间? The mystery involves a change in the atmosphere--a hole,or thinning.of theozone in the atmosphere over Antarctica. The trouble first展开更多
基金supported by the President of the ChineseAcademy of Forestry Foundation (CAFYBB2008009)
文摘The title compound 2-amino-4-（4-hydroxy-3,5-dimethoxyphenyl）-5-methyl-6- phenyl nicotinonitrile, C21H19N3O3, was synthesized via four-component reactions between propiophenone, malononitrile, syringaldehyde and ammonium acetate in ethanol under reflux without catalyst and characterized by IR, 1H NMR, 13C NMR, MS, EA and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis shows that the compound is of monoclinic system, space group P21/n with a = 8.4600（17）, b = 17.139（3）, c = 13.408（3） A, β= 107.06（3）°, V= 1858.6（6） A3, Z = 4, Mr = 361.39, F（000） = 760, μ（MoKa） = 0.088 mm^-1 Dc = 1.292 g/cm3, 2 = 0.71073 A, the final R = 0.0751 and wR = 0.0938 for 3333 observed reflections with I〉 2σ（I）. The crystal packing of the title compound is stabilized by intermolecular hydrogen bonds.
文摘《列子·天瑞》里说,札国有个人,担心天要坍塌下来他将无处存身,因此愁得觉也睡不着,饭也吃不下。后人就用“札人忧天”比喻不必要的或无根据的忧虑。 臭氧这篇文章读后真让人们去“忧天”了！国人惯说“天塌下来”,看来,天是塌不下来的,但是,天上出现了伤及人类的“臭氧洞”: Scientists say a decrease in ozone and an increase in the harmful radiation willcause many more cases of skin cancer and will harm crops,animals and fish. 本文是美国之音的广播稿,从文中知道,成文的时间是1989年。但是,此文现在还在广播,究其原因,大概是本文深入浅出地向读者(听众)交代了关于臭氧的基本知识。 比如,什么是臭氧? Ozone is a three—atom form of oxygen gas. 臭氧的利弊? It is found both in the air we breathe and in the upper atmosphere.atmosphere Near theEarth,ozone in the air is a danger to life.It is a pollutant.But ozone found 10kilometers to 50 kilometers up in the atmosphere protects life on Earth. 臭氧洞及其发现的时间? The mystery involves a change in the atmosphere--a hole,or thinning.of theozone in the atmosphere over Antarctica. The trouble first
