共查询到20条相似文献,搜索用时 78 毫秒
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标题化合物C27H23FN4O2(C2H5OH)是由2分子1-苯基-3-甲基-5-吡唑啉酮和1分子2-苯甲醛微波辐射4 m in,用乙醇重结晶得到。在该化合物的晶体结构中,一个结构单元包含1分子4,4′(2-氟苯基)双(1-苯基-3-甲基-5-吡唑啉酮)甲烷和1分子乙醇。结构通过X射线衍射法确定,其晶体属于单斜晶系,P21/c空间群,Mr=500.56,a=0.949 6(19)nm,b=2.217 4(4)nm,c=1.285 4(3)nm,β=100.71(3)°,V=2.659 5(10)nm3,dc=1.250 g/cm3,Z=4,F(000)=1 056,μ=0.087 mm-1,最终偏差因子分别为R=0.059 1,wR=0.149 9,分子之间通过相邻分子间形成的N—H…O和O—H…N氢键相连。 相似文献
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引言 RE-10885是一种新的呋喃酮类除草剂,由美国Chevron化学公司农药部创制(Ward,1986)。该化合物是从5-氨基-4-苯基呋喃-3(2H)-酮新系列中筛选出来的,最初研究是在花生、棉花、高粱和向日葵方面。多种阔叶和禾本科杂草植前混土和芽前处理后呈现褪绿白化状除草活性。温室和田间试验还证明了芽后处理防除杂草的活性。由于RE-108s5主要是防除阔叶杂草,因此为了扩大杀草谱,最好与防除禾本科杂草的除草剂混合使用。本篇论文报道1985和1986年在美国温室和田间的试验结果。 相似文献
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海洋放线菌Y-0117农用活性代谢产物的研究 总被引:1,自引:0,他引:1
在农用抗生素筛选中发现代号为Y-0117的海洋放线茵菌株所产生的代谢产物对植物病原真菌具有良好的抑制作用。对Y-0117发酵液进行萃取、硅胶柱层析、制备薄层色谱、制备HPLC,分离纯化得到两个活性组分0117A和0117B。通过紫外光谱、质谱、核磁共振等手段,确定0117A的分子式为C35H58O8,分子量为604。结构与已知化合物Bafilomycin D相同;0117 B的分子式为C42H60O12.分子量为756,结构与近期发现具有抗癌活性的已知化合物Hygrobafilomycin相同。研究发现0117B对多种植物病原真菌具有良好的抑制活性,对稻瘟病菌的最小抑制浓度为15.63μg·mL^-1。 相似文献
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对一种褐煤的直接液化加氢前、后溶剂油进行了1H核磁共振波谱、元素组成和分子量等性质的分析和平均结构参数的计算,研究了加氢前、后溶剂油分子的平均结构.结果显示:加氢处理前、后溶剂油的平均分子式为C17H23S0.004N0.09O0.12和C16H24S0.003N0.03O0.03,加氢前溶剂平均分子的芳碳率fa为0.46,平均分子结构含有2~3个环,其中芳香环为1~2个,环烷环为1个.经过加氢处理后溶剂油分子的平均结构发生较大的变化,溶剂平均分子芳碳率fa为0.37,平均分子结构中含有2个环,其中芳香环1个,环烷环1个,经加氢处理后,溶剂具备了较好的供氢性能. 相似文献
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以6,10-二氧杂螺[4.5]7,9-十烷二酮为先导化合物,合成了两种新型螺环化合物C_(15)H_(14)N_2O_6和C_(15)H_(14)ClNO_4,并通过红外光谱(IR)、元素分析仪(EA)和X-射线单晶衍射仪对其结构进行表征。结果表明,C_(15)H_(14)N_2O_6属于单斜晶系,晶胞群为P21/c,晶胞参数为a=11.251(2)、b=11.001(2)、c=12.750(3)、β=114.20(3)°、V=1 439.5(5)3、Z=4。C_(15)H_(14)ClNO_4也属于单斜晶体,晶胞群为P21/c,晶胞参数为a=13.159(3)、b=6.219 7(12)、c=17.750(4)、β=96.46(3)°、V=1443.5(5)3、Z=4。C—H…O和N—H…O分子间作用力对晶体C15H14N2O6的稳定性起到重要作用,而C—H…O、C—H…π分子间作用力和π…π堆积作用所形成的三维网状结构加强了C_(15)H_(14)ClNO_4的结构稳定性。同时对两种化合物的除草活性进行了研究,结果发现它们对双子叶植物的生长具有较好的抑制作用。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献