4-溴邻苯二胺的合成

采用两条路线合成４溴邻苯二胺,并对路线（Ⅱ）中水解一步作了探讨这两条路线是：１．用漆原镍催化氢化 ４溴２硝基苯胺;２．邻苯二胺溴化后,碱水解中间体 Ｎ, Ｎ（４溴１,２苯基）双乙酰胺     

Total Synthesis of (±)-Nimbonone and (±)-12-Ethyl-13-methoxy- 8,11,13-podocarpatriene

Most diterpenoids exhibit significant bioactivities, such as antidermatophytic, antibact- erial, and antioxidant. Although a large number of aromatic tricyclic diterpenoids have been isolated, there are a few of them having ethyl substituent. The synthesis of this type diterpenoids has been seldom reported. In order to further study the relationship between the structure and bioactivities of the diterpenoid, we extended the diterpene synthesis1,2,3. It is desirable to report herein the syn…     

The Electronic Structures and Chemical Bonding of Some Dinuclear and Trinuclear Low－valence Molybdenum Complexes Containing Thiolate Bridges

ＴｈｅＥｌｅｃｔｒｏｎｉｃＳｔｒｕｃｔｕｒｅｓａｎｄＣｈｅｍｉｃａｌＢｏｎｄｉｎｇｏｆＳｏｍｅＤｉｎｕｃｌｅａｒａｎｄＴｒｉｎｕｃｌｅａｒＬｏｗ－ｖａｌｅｎｃｅＭｏｌｙｂｄｅｎｕｍＣｏｍｐｌｅｘｅｓＣｏｎｔａｉｎｉｎｇＴｈｉｏｌａｔｅＢｒｉｄｇｅｓＨ...     

MULTIPLE MELTING BEHAVIOR OF β-CRYSTALLINE PHASE POLYPROPYLENE

Differential scanning calorimetry and X-ray diffraction experiments on β-nucleated polypropylene were made on the samples crystallized at different temperatures and processed by injection molding. The crystal perfection was shown to vary with crystallization temperature. The observed multiple peaks could be related to a ill-phase with defective inclination of the chains, a recrystallized or original β_2-phase of more perfect inclination, and the α-phase. Injection molded samples could be analyzed from the established DSC interpretation.     

流动注射-火焰原子吸收光度法测定矿泉水中的锶

用流动注射离子交换系统于酸性条件下在线富集饮用天然矿泉水中的锶,火焰原子吸收光度法测定,共存成分无干扰,方法简便快速,富集倍数可随意调节。在 60 h～(-1)的进样频率下,灵敏度提高 17倍。用于矿泉水中锶的测定,当含量为 60～250 ng/ml时,相对标准偏差为 0.68％～0.94％。回收率为 94.4％～110.3％,检测限为 15ng/ml。     

Synthesis, Crystal Structure, and Properties of [Cu(tren)(im)Zn(tren)](ClO_4)_3·CH_3OH as a Model Compound of BESOD

This paper reports the synthesis,properties and crystal structure of the title model compound with the ESR parameters g_∥ =2.007,g_⊥=2.191, A_∥=0.0061 cm~(-1), and A_⊥=0.0114 cm~(-1). The crystal belongs to space group C_2~2-P2_1,a=8.924(2),b=11.590(4), c=16.356(6),β =91.40(2)°,Z=2.Cu(Ⅱ) and Zn(Ⅱ) are bridged by the imidazolate ring, with the distance of 5.84.The conductivity and electronic reflectance spectrum of the complex are described.pH dependence in an aqueous solution is also investigated by potentiometric titration, and fitted by a self-written computer program. The results indicate that the imidazolate bridge splits at the side facing Zn(Ⅱ) below pH 8.     

新型复合无机离子交换剂磷锑酸——磷钼酸铵的合成与性能研究

本文研究了新型复合无机离子交换剂磷锑酸—磷钼酸铵（ＰＡＡ—ＡＭＰ）的制备和对１３７Ｃｓ＋的交换性能。这种交换剂成型好且稳定，对Ｃｓ＋有良好的选择性和较高的交换容量，与以前的四价金属磷酸盐类复合材料相比，它吸附Ｃｓ＋后可直接用浓度高的ＨＮＯ３洗脱下来，实现了低酸交换吸附，高酸淋洗再生的工艺要求，是一种性能优良的无机离子交换材料，可从放射性废液中分离和回收（１３７）Ｃｓ＋。     

The Effect of Platinum on Stability of the B2O3/TiO2-ZrO2 Catalyst for Beckmann Rearrangement of Cyclohexanone Oxime

It has been well illustrated that the rapid catalyst deactivation with time is the most serious limitation of vapor phase approach to the production of ε-caprolactam from cyclohexanone oxime (CHO) (Scheme 1), and is a common problem with all catalyst typ…     

Studies on Macrocyclic Diterpenoids (Ⅵ)——A Novel Synthetic Route to (±)-Cembrene-A

The total synthesis of(土)-cembrene-A, a termite pheromone, was achieved from geranylacetone and geraniol as starting materials. The key steps were the phase transfer catalyzed coupling reaction of sulphone (6) with chloride (9) and the intramolecular macrocyclization of dicarbonyl precursor (12) induced by low valent titanium. The synthetic route was short with anoverall yield of 17%.     

SYNTHESIS AND CHARACTERIZATION OF β-DIKETONE BASED SIDE CHAIN LIQUID CRYSTALLINE POLYSILOXANES

A new type of β-diketone based side chain liquid crystalline polysiloxanes (DKLCP) with different length of flexible spacers and end groups have been synthesized by hydrosilation reaction. This is liquid crystal polymers (LCP) using coordinating β-diketone ligand as mesogens. The phase behaviour of DKLCP polymers was studied by differential scanning calorimetry and polarizing microscopy. X-ray diffraction investigations demonstrated that the polysiloxanes with sufficiently long flexible spacers were smectic liquid crystal polymers, while those with much shorter spacers were nematic ones.