金属β-二酮化合物用于MOCVD法生长铁电氧化物薄膜

对用于MOCVD法生长铁电氧化物薄膜的金属β－二酮化合物的制备、结构及性质进行了评述，对它们在生长铁电薄膜中的应用现状进行了介绍，并对它们的应用前景作了展望。     

新型钝感炸药1-氧-2，6-二氨基-3，5-二硝基吡嗪的合成及表征

美国LLNL1995年合成出的代号为LLM-105的高能量密度材料，其化学名称为1-氧-2，6-二氨基-3，5-二硝基吡嗪（2，6-diamino--3，5-dinitropyrazine-1-oxide），分子结构式C4H4N605，分子量216．04，密度为1．913g／cm^3，氧平衡为-37．03％，生成热为-3．1kcal／mole，外观为亮黄色的针状晶体，比TATB的能量约高25％，且有着良好的热安定性，特性落高Dh50=117cm（RDX和HMX的特性落高30-32cm），对静电火花的刺激也很钝感。由于综合性能优异，LLM-105已经引起了国际炸药界的极大兴趣。     

2-乙酰氨基-3,4,6-三乙酰葡萄糖的合成

细菌内毒素(ＬＰＳ)是革兰氏阳性阴性菌细胞外膜层的主要成分,由其引起的革兰氏阴性杆菌脓度症和休克是导致战创伤病人死亡的主要原因之一。而从类脂Ａ(ＬｉｐｉｄＡ)的结构出发,以非肽类物质拮抗内毒素受体ＣＤ-14为治疗手段的研究在国外刚刚起步。2-乙酰氨基-3,4,6-三乙酰葡萄糖是合成ＬｉｐｉｄＡ结构类似物的重要中间体[1,2]。它的合成一般是通过氨基葡萄糖五乙酸酯的选择性水解[3-6]脱去一个乙酰基得到。氨基葡萄糖五乙酸酯是通过氨基葡萄糖的乙酰化反应得到的,由于氨基葡萄糖不稳定,一般是用氨基葡萄糖的盐酸盐作为起始原料。由于…     

Influence of Mobile Phase Composition on the Enantioseparation of Meythoxyl Flavanones with Self—prepared CDMPC Column and Chiral Recogniton Mechanism

The influence of different alcohol modifiers in mobile phase on the chiral separation of 4‘‘‘‘‘‘‘‘-methoxyl flavanone,5-methoxyl flavanone and 6-methoxyl flavanone on cellulose tris(3,5-dimethylphenylcarbamate)(CDMPC)column was studied and the chiral recognition mechanism was discussed.Using hexane-tert-butanol(1.31molL^-1) as the mobile phase,those three methoxyl flavanones were excellently separated on CDMPC chiral column.     

4，4′—二偶氮苯重氮氨基偶氮苯与Ag（I）的显色反应及其应用

本文报道了4,4′ -二偶氮苯重氮氨基偶氮苯在Triton X-100存在下与Ag(Ⅰ)的显色反应.在pH10.0的硼砂-氢氧化钠缓冲溶液中,试剂与Ag(Ⅰ)形成1∶1的红色配合物,其最大吸收波长为540nm,表观摩尔吸光系数为7.55×104L*mol-1*cm-1,Ag(Ⅰ)的浓度在0-0.28mg/L范围内符合比耳定律.应用于显影废液和钮扣电池液中Ag的测定,结果令人满意.     

法沃尔斯基（FavorskiiAE）重排新进展

本文介绍了近年来法沃尔斯基重排反应在手性药物，立方烷系，杂环衍生物环烷小合成中的最新动态有应用前景。     

A New Cytotoxic Acetogenin from the Seeds of Annona squamosa

A New Annonaceous acetogenin,squamostolide(1),was isolated from the seeds of Annona squamosa.Its structure was elucidated based on spectroscopic methods and comparison with known compounds.It is the first example of Annonaceous acetogenin with each of the two ends of the aliphatic chain bearing a γ-lactone.Thenew compound exhibited cytotoxic activity in vitro against bel-7402 and CNE2 human tumor cell lines.     

An Improved Synthesis of Retinoic Acid from β-Ionone

A convenient and large-scale preparation of retinoic acid 1 from β-ionone in five steps with 38% overall yield is described.The key steps are the epoxidization of 2 with a new methylated agent and the condensation 4 with tetraethyl methylenediphophonate in one-pot procedure to prepare 6.     

Single＆Two—photon Excited Fluorescence of Two New Compounds with 2—Benzothiazoly as Electron Acceptor

Two new D-x-A type compounds,where electron-donor D is tertiary amino group,electron-acceptor A is 2-benzothiazolyl and x is two conjugated styryl units,have been synthesized.They are named as trans,trans-2-{4-[4-(N,N-diethylamino)styryl]styryl}-1,3-benzothiazole and trans,trans-2-{4-[4-(N,N-diphenylamino)styryl]styryl}-1,3-benzothiazole.Both compounds show strong two-photon excited fluorescence in yellow-orange region when excited by a femtosecond laser at 800nm.     

吸附溶出伏安法测定毗喳酮的研究

本文报道了用吸附溶出伏安法测定毗喳酮.以悬汞电极为工作电极，在Na}B,O,-NaOH介质(pH=10)中，毗喳酮产生一尖锐的吸附还原峰,E，二一1. 29V (vs. SCE )，峰电流与毗喳酮浓度在2. 0 X 10-'-8. 0 X 10-smol " L-’范围内呈良好的线性关系.检测限为2. 0 X 10-0mol " L-'(富集90s).本文对毗喳酮在悬汞电极上的电化学行为进行了探讨，对测定毗喳酮的最佳条件进行了详细的选择，利用本法测定了片剂中毗喳酮含量，结果满意.