羟丙基三甲基氯化铵壳聚糖制备的可控性研究

用壳聚糖与缩水甘油三甲基氯化铵反应制备羟丙基三甲基氯化铵壳聚糖,所得产物的结构受壳聚糖分子量和脱乙酰度、反应温度、反应时间、壳聚糖与缩水甘油三甲基氯化铵投料比的影响。实验结果表明：随着反应温度升高,羟丙基三甲基氯化铵壳聚糖的取代度增加,在70～80℃达最大;反应时间增加,取代度增加,产物分子量降低。缩水甘油三甲基氯化铵与壳聚糖比例达3：1前取代度随比例升高而增加。脱乙酰度和分子量越大的壳聚糖其季铵盐取代度越高。控制反应温度在30～90℃,反应时间3～10h,投抖比为1：1～4：1,可以得到取代度15％～909／6,分子量1万到100万的羟丙基三甲基氯化铵壳聚糖。     

Novel Chiral Ferrocenyl Aziridino Alcohol Catalysts Promoting Asymmetric Addition of Diethylzinc to Aldehydes

Optically active aziridino alcohols containing ferrocenyl groups were prepared from commercially available L-threonine in excellent yields and used as catalysts to promote the asymmetric addition of diethylzinc to aryaldehydes to afford 1-arylpropanol in up to 84% enantiomeric excesses with moderate to good yields.     

Synthesis, Characterization and the Effect of Glucose-lowering of Guanidino Acid Oxovanadium（Ⅳ） Complexes

Two guanidino acid oxovanadium(Ⅳ) complexes have been synthesized. Preliminary tests in vivo have shown that the two title complexes all display lowering glucose activity in vivo to STZ-rats. The effect of glucose-lowering of guanidino acetic acid oxovanadium(Ⅳ) complex in vivo is higher than that of guanidino propanoic acid oxovanadium(Ⅳ) complex.     

Stereoselective Synthesis of （E）-α-Aryltellurenylvinyl-stannanes and Their Application in the Synthesis of Stereodefined Trisubstituted Alkenes

(E)-α-Aryltellurenylvinylstannanes have been synthesized stereoselectively via the hydrozirconation of alkynylstannanes, followed by the reactions with aryltellurenyl iodides. (E)-α-Aryltellurenylvinylstannanes can undergo sequential cross coupling reactions with both electrophiles and nucleophiles in the presence of transition metal complexes to form two carbon-carbon bonds in the same olefinic carbon leading to trisubstituted alkenes stereoselectively.     

Synthesis and Crystal Structure of Ethyl （2-Amino-4-（2-chlorophenyl）-4H-benzo-[h]-chromene-2-yl） Formate

1 INTRODUCTION 2-Aminochromene is an important class of compounds as the main compounds of many natu- rally occurring products which can be used as cos- metics and pigments[1] and potential biodegradable agrochemicals[2～4]. Inorganic solid supports as c…     

溶菌酶与邻-{2[α-(2-羟基-5-磺酸苯偶氮)-亚苄基]肼基}苯甲酸反应的分光光度研究

采用分光光度法对溶菌酶(Lys)与邻-{2-α-(2-羟基-5-磺酸苯偶氮)-亚苄基]肼基]苯甲酸(ZCN)反应体系进行了研究,配合物的最大吸收波长为560nm,与试剂本身比较,吸收峰红移100nm.实验研究了在Ph4.36的酸性条件下温度、时间、离子强度等对反应体系的影响;测定了反应的线性范围为0～16 mg/L;最低检出限2.49×10-7mol/L,ZCN与Lys最大结合数n=19,表观摩尔吸光系数ε=0.971×105L·cm-1·mol-1;离解度α=0.217;结合常数K=7.81×106等,并对该反应体系的机理进行了研究,同时测定了无机物质、生物物质和表面活性剂对反应体系的干扰情况,并建立了溶菌酶与ZCN的研究体系.     

微乳液增敏钼(Ⅵ)-3′,5′-二溴水杨基荧光酮络合物光谱探针测定蛋白质

研究了在乳化剂OP微乳液介质中钼（Ⅵ）-3′,5′-二溴水杨基荧光酮(3′,5′-DBSF)-蛋白质体系的相互作用和吸收光谱情况。在最佳条件下,牛血清蛋白质含量在0～10mg／L范围内服从比尔定律;同时测得络合物与蛋白质的结合数n=93。乳化剂OP微乳液引入到蛋白质的测定中提高了体系的灵敏度。结果表明：该法具有很高的灵敏度、选择性和稳定性,可直接用于人尿、奶粉和人血清样品的定量测定。     

N-茄呢基谷氨酰胺类化合物的合成

在N,N 二环己基碳二酰亚胺存在下,N 苯甲酰 Nα 茄呢基 L 谷氨酰胺酸和N 羟基琥珀酰亚胺反应制成活化酯,然后分别与胺或者氨基酸甲酯盐酸盐反应制得3种新N 茄呢基谷氨酰胺类化合物.这些化合物的结构经IR、1HNMR、MS和元素分析确证.     

N,N,N'''',N''''-四丁基丙二酰胺萃取Yb(Ⅲ)的研究

取代酰胺类萃取剂易合成、分解产物易除去可用于萃取铀(Ⅳ)、钍(Ⅳ)，但对高放废液中共存稀土元素的萃取研究较少。本文在以前研究工作的基础上，进一步探讨了TBMA萃取Yb(Ⅲ)的性能。     

Syntheses, Structures and Coordination Behavior of Central Hydroxyl Group Containing Polydentate Ligands

Proteins containing dinuclear Cu (II), Zn (II) centers play paramount roles in biology1. As mimetic of metal-dependent esterase, dinuclear Cu (II) and Zn (II) complexes have received a great deal of attentions2~6. They are of interest in the field of biomimetic chemistry to provide an improved understanding of the function of the biological sites and as potential catalysts for substrate oxidations. Schiff base type polydentate ligands which contain centeral hydroxyl group have been wid…