芳香─脂肪族共聚酰胺的序列结构和溶致液晶性能

本文利用对苯二甲酰氯（ＴＰＣ），对苯二胺（ＰＰＤ）和亚甲基数为２和６的两种脂肪族二元胺（ＡＤＡ）合成了具有不同序列结构的芳香一脂肪族共聚酰胺．研究了共聚酰胺的序列结构参数──无规度Ｂ和数均序列长度Ｌｎ与液晶临界浓度Ｃ＊和中介相的类型之间的关系．     

国内外碳酸二甲酯酯交换反应催化剂研究进展

碳酸二甲酯（DMC）是一种重要的有机合成原料及中间体，DMC带有-CO、-COOCH3和CH3基团，可进行羰基化、甲基化、甲氧基化和羧甲基化反应，取代传统使用的有毒原料光气、硫酸二甲酯和甲基氯等。因此，1992年DMC在欧洲被登记为绿色无毒化学品，DMC可替代光气合成聚碳酸酯、碳酸二苯酯、异氰酸酯（TDI、MDI、HDI、IPPI）及烯丙基二甘醇碳酸酯（ADC）；也可用于合成氨基甲酸酯类农药（西维因）、苯甲醚、甲基芳胺等；此外，DMC具有高的含氧量（53．3％），可以用做汽油添加剂，能有效提高汽油的辛烷值；还具有与其它溶剂相溶性好，蒸发速度快的特点，适于在特种油漆、药物制造行业使用。因此，碳酸二甲酯是一种有广阔发展前景的化学品。     

稀土铜硫化合物TbCuS2的合成和晶体结构

Terbium copper disulfide, TbCuS₂, has been synthesized in the reaction of the elements in a KI flux at 850 ℃. The compound crystallizes in space group P2₁/c of the monoclinic system with four formula units in a cell of dimensions of a= 0.639 3(1) nm, b=0.702 5(1) nm, c=0.670 8(1) nm, β=98.097(4)°, and V=0.298 3(1) nm³ at 153 K. The structure comprises two-dimensional ²_∞[CuS₂] layers along [100] separated by the Tb atoms. In the structure, each Tb and Cu atoms are coordinated to seven and four S atoms, respectively. CSD: 415490.     

茜素荷移分光光度法测定泛酸钙

泛酸又名遍多酸，是人和动物所必需的一种B族维生素，作为辅酶A的一个重要组成部分参与体内新陈代谢，特别是对脂肪的合成与代谢起着十分重要的作用，近年来作为营养增补剂，广泛应用于医药、食品和饲料工业。商品泛酸通常制成钙盐即泛酸钙，目前已报道的分析方法主要有微生物测定法、酶联免疫法和高效液相色谱法以及以测定泛酸水解后的产物β-丙氨酸为基础建立起来的离子交换层析分光光度法和茚三酮分光光度法等，     

纤维素基磁性聚偕胺肟树脂的研究——锌副族金属离子在树脂上的吸附

研究了Ｚｎ２＋、Ｃｄ２＋、和Ｈｇ２＋离子在碱式纤维素基磁性聚偕胺肟树脂（ＢＭＡＯ）上的吸附动力学。结果表明，吸附速度受粒内扩散所控制。测得粒内扩散系数分别是１．２２×１０－４、２．４２×１０－４和３．９０×１０－４ｃｍ２·ｓ－１；Ｈｇ２＋离子在树脂上的吸附行为符合Ｆｒｅｕｎｄｌｉｃｈ和Ｌａｎｇｍｕｉｒ等温吸附方程；浓集因数随Ｈｇ２＋离子浓度降低而上升，有利于从稀溶液中除去Ｈｇ２＋离子。将树脂加至Ｚｎ２＋、Ｃｄ２＋或Ｈｇ２＋离子浓度为５０ｐｐｍ的溶液中，离子去除率分别是９６．１、９９．９和９９．３％。     

Aromatic H／D Exchange Reaction Catalyzed by Groups 5 and 6 Metal Chlorides

Groups 5 and 6 metal chlorides such as MoCl5, WCI6, NbCl5 and TaCl5 were found to be simple and very efficientcatalysts for the aromatic H/D exchange reactions. Compared with other metal chlorides such as ZnCl2, SnCl4 and TiCl4, groups 5 and 6 metal chlorides showed better catalytic activity in the H/D exchange reaction of naphthalene with C6D6. Deuteration of anthracene using MoC15 as a catalyst proceeded within 24 h at room temperature. Other aromatic compounds such as toluene, diphenylmethane and 1,1,2-triphenylethane were also deuterated smoothly in C6D6 within 24 h at room temperature.     

诱导效应指数与脂肪族胺、醇和醚的气相碱性

用烷基诱导效应指数I和RX分子中质子亲合原子X所带电荷qx及元素电负性XN与 脂肪胺，醇、醚的气相质子亲合PA进行关联，结果表明，脂肪胺，醇、醚的气相碱 性可以用下式定量描述：PA(kJ.mol^-1)-2732.0333-2457.1510∑I-1492.2351qx- 732.6277XN利用上式对64种化合物的气相碱性进行预测，平均相对误差为0．34％ ，预测值和实验值的偏差均在实验误差范围内。     

Two New Steroidal Glycosides from Fermented Leaves of Agave americana

Two new spirostanol glycosides named agamenoside A and B, ere isolated from the fermented leaves of Agave americana. Their structures were elucidated as (23S,25R)-5α-spirostan-3β,6α，23－triol 3-O-α-L-rhamnopyranosyl-(1→3)-β-D-glucopyranosyl-(1→2)-[β-D-xylopyranosyl-(1→3)]-β-D-glucopyranosyl-(1→4)-β-D-galactopyranoside(1) and (25R)-5α-spiro-stan-3β,6α-diol 3-O-β-D-glucopyranosyl-(1→2)-[β-D-xylopyranosyl-(1→3)]-β-D-glucopyra-nosyl-(1→4)-β-D-galactopyranoside(2) by a combination of chemical and spectral methods.     

汽油族组成的近红外光谱快速测定

以荧光指示剂吸附色谱法（FIA）测定汽油族组成结果为基础，采用近红外光谱和化学计量学方法建立了快速、准确测定催化裂化馏出口汽油族组成（饱和烃、烯烃和芳烃）的分析模型；试验表明，该法分析速度快、重复性好、成本低，特别适用于生产中间控制分析。     

离子液体存在下脂肪醛的环化三聚反应

Aliphatic aldehydes such as ethanal,propanal,n-butanal,isobutyraldehyde,n-valeraldehyde,isovaleraldehyde,n-hexanal and n-octanal were converted into the corresponding 2,4,6-trialkyl-1,3,5-trioxanes through cyclotrimer-ization in the presence of the ferric chloride based ionic liquids at room temperature without solvent in high selec-tivity.The effects of different ionic liquids,acidity of ionic liquids and temperature on cyclotrimerization were alsostudied.The results showed that the ferric chloride based ionic liquids(apparent molar fraction of FeCl_3(x(FeCl_3)=0.62))were a kind of efficient catalysts for the cyclotrimerization of aliphatic aldehyde which could be separatedconveniently from the reaction mixture and recycled without loss of catalytic activity.The conversion of isobu-tyraldehyde and the selectivity to 2,4,6-triisopropyl-1,3,5-trioxane were 91.1% and 99.8% respectively under opti-mum reaction condition(isobutyraldehyde 25.0 g,[Et_3NH]Cl/FeCl_3(x(FeCl_3)=0.62)1.0 g,25 ℃for 1 h).