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手性是生命现象的基本要素之一,生命现象涉及的基础物质大多具有手性,许多手性化合物具有强烈的或者重要的生理功能.因此,获得和控制手性物质已经成为医药工业发展的方向.不对称合成是制备手性化合物的最有效的方法,是当前有机化学研究的热点和前沿.而催化不对称合成是最理想的不对称合成方法,也最有开发价值,它仅使用少量的手性催化剂便可获得大量的手性产物,无论是从理论上还是实际应用上都具有非常重要的意义.其中手性相转移催化剂诱导的不对称合成,由于使用条件温和、操作简单、化学产率和光学纯度较高而倍受关注.但现有的手性相转移催化剂种类较单一,所以研究开发性能良好的新型手性相转移催化剂,具有重大的理论意义和潜在的经济价值. 相似文献
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Effective elastic properties of spherically anisotropic piezoelectric composites, whose spherically anisotropic piezo-electric inclusions are embedded in an infinite non-piezoelectric matrix, are theoretically investigated. Analytical solutions for the elastic displacements and the electric potentials under a uniform external strain are derived exactly. Taking into account of the coupling effects of elasticity, permittivity and piezoelectricity, the formula is derived for estimating the effective elastic properties based on the average field theory in the dilute limit. An elastic response mechanism is revealed, in which the effective elastic properties increase as inclusion piezoelectric properties increase and inclusion dielectric properties decrease. Moreover, a piezoelectric response mechanism, of which the effective piezoelectric response vanishes due to the symmetry of spherically anisotropic composite, is also disclosed. 相似文献
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巴豆种子油的GC-MS分析 总被引:8,自引:0,他引:8
巴豆种子经石油醚或无水乙醇提取得巴豆种子油,通过气相色谱-质谱联用仪(GC-MS)测定其中的化学夸分,结果显示,巴豆种子油中含有26个组分,本文确定了其中22个组分的结构。 相似文献
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Six novel tetrazoles were designed, synthesized and characterized by NMR and elemental analysis. 2-Dehydroabietyl-5-ethylsulfanyl-1,2,3,4-tetrazole (4b), C23H34N4S, was structurally determined by single-crystal X-ray diffraction. It crystallizes in the orthorhombic system, space group P212121, with a = 7.391(3), b = 12.580(3), c = 24.036(8) A^°, V= 2234.8(13) A^°^3, Z = 4, M, = 398.60, Dc = 1.185 g/cm^3, μ = 0.160 mm^-1, F(000) = 864, the final R = 0.0499 and wR = 0.0638 for 1228 observed reflections with I 〉 2σ(I). There are four rings in the crystal structure, and C(14) adopts the R absolute configuration. In addition, disordered C(19), C(20), C(21), C(22) and C(23) exist in the crystal structure. 相似文献