二碘化钐引起的分子内还原偶联反应

本文综述了二碘化钐引起的分子内还原偶联反应,包括分子内酮一烯还原偶联、酮一炔还原偶联、频哪醇偶联和其它有关还原偶联反应。     

二溴磺酸偶氮氯磷-溴代十六烷基吡啶-钐-乙醇显色体系的分析研究

研究了Sm（Ⅲ）-DBS·CPA-CPB-C2H5OH体系的光度特性和最佳反应条件,该体系与Sm（Ⅲ）-DBS·CPA体系相比,虽灵敏度未见明显提高,但选择性却有显著提高.Sm（Ⅲ）浓度在0.0—12μg/25ml范围遵循比尔定律,当λmax=662nm,表观ε=8.9 × 104L·mol-1·cm-1,方法用于矿样测定结果满意.     

α，α＇-邻苯二甲基桥联双茚基钐二苯胺化物催化丙烯腈聚合

以α,α＇-邻苯二甲基桥联双茚基钐二苯胺化物为催化剂,对丙烯腈聚合反应进行了研究,考察了催化剂用量、反应时间及反应温度对丙烯腈聚合的影响,并且用粘度法对聚合产物的粘均分子量进行了表征。发现α,α＇-邻苯二甲基桥联双茚基钐二苯胺化物对丙烯腈聚合反应具有极高的催化活性。随着催化剂用量增加聚合反应转化率增大,聚合产物的粘均分子量下降;延长反应时间,转化率和分子量都增大。     

氨基酸砷配合物的合成、表征及抑菌活性

以L-赖氨酸、L-苏氨酸和三碘化砷为原料,采用室温固相合成法合成了两种新型氨基酸砷配合物。通过元素分析、紫外光谱、X-射线粉末衍射和红外光谱对配合物进行了表征,确定了配合物的化学组成和结构,并研究了配合物的抑菌活性。     

Sm/TiCl4 （cat.） system-mediated intermolecular and intramolecular reductive coupling reactions of ketones with esters

Sm/TiCl4 system could well integrate the high reactivity of samarium（Ⅱ） and high deoxygenation capacity of low valent titanium within one system. In this paper, the intermolecular and intramolecular reductive coupling reactions of ketones with esters mediated by metallic samarium （Sm） and a catalytic amount of titanium tetrachloride （TiCl4） were successfully developed. A series of substituted ketones and cyclic β-keto-esters were prepared in moderate to good yields under reflux and neutral conditions.     

水杨酸钐的流变相合成与热分解机理研究

用流变相合成了水杨酸钐。通过热重分析（TG/DTG/DTA）技术确定了固体物质的组成,同时研究了水杨酸钐晶体Sm2（C7H5O3）6的热分解过程。结果表明,Sm2（C7H5O3）6的热分解过程为多步分解进行,其实验失重率与理论计算失重率相符。     

Remarkable rate acceleration of SmI3-mediated iodination of acetates of Baylis-Hillman adducts in ionic liquid： facile synthesis of （Z）-allyl iodides

Stereoselective transformation of Baylis-Hillman acetates I into corresponding （Z）-allyl iodides 2 has been achieved by treatment of I with samarium triiodide in THF. Remarkable rate acceleration of samarium triiodide-mediated iodination of 1 was found when ionic liquid 1-n-butyl-3-methyl-imidazolium tetrafluroborate （[bmim]BF4） was used as reaction media in stead of THF. This novel approach proceeds readily at 50 ℃ within a few minutes to afford （Z）-allyl iodides 2 in excellent yields. A mechanism involving stereoselective iodination of the acetates of Baylis-Hillman adducts by samarium triiodide is described, in which a six-membered ring transition state played a key role in the stereoselective formation of 2.