A New Brominated Phenylpropylaldehyde and its Dimethyl Acetal from Red Alga Rhodomela confervoides

A new brominated phenylpropylaldehyde and its dimethyl acetal together with a new natural brominated phenol were isolated from Rhodomela confervoides. Their structrues were elucidated as 2-methyl-3-(2,3-dibromo-4,5-dihydroxyphenyl)propylaldehyde, 2-methyl-3-(2,3-di-bromo-4,5-dihydroxyphenyl) propylaldehyde dimethyl acetal and 3-bromo-4,5-dihydroxybenzoic acid methyl ester by spectroscopic techniques including IR, HRFABMS, 1D and 2DNMR experiments.     

有机锡聚醚的合成及性质的研究

利用界面缩聚技术,将二烷基二氯化锡、二(β-烷氧羰乙基)二氯化锡与有机二元醇、酚、硫醇反应,制成了一系列新的有机锡大分子化合物.对这些新化合物进行了分子量、红外光谱、TG/DTG测试.对有机锡大分子化合物阻止聚氯乙烯(PVC)热分解性能进行了测定.结果表明,新合成的有机锡聚醚化合物可作为PVC热稳定剂使用.     

超分子体系中分子内扭转电荷转移——β-环糊精对对二甲基胺基苯甲醛TICT过程的微环境效应

用荧光光谱法研究了β-环糊精(β-CD)对对二甲基胺基苯甲醛(DMABA)的分子内扭转电荷转移(TICT)的微环境效应。在纯水及β-CD水溶液中均观察到了DMABA的TICT的典型的双重荧光发射,β-CD对DMABA的TICT荧光性质有显著影响。实验还观察到TICT荧光带与正常荧光带强度比与DMABA浓度有线性关系,β-CD的引入使该线性斜率提高。结合吸收光谱结果讨论了DMABA的TICT激发态性质,DMABA与β-CD的作用方式和β-CD微环境效应的本质特征。     

Synthesis and Crystal Structure of Ag2（admtrz）2（CF3CO2）2（admtrz=4—amino—3,5—dimethyl—1,2,4—triazole）

1 INTRODUCTION Transition metal complexes bridged by 1, 2, 4-triazole group can produce interesting structures and specific properties[1]. Many attempts have been made to synthesize a variety of complexes with paramagnetic centers by using such ligands, and their structures and magnetic properties have been characterized[2]. However, the polynuclear Ag(I) complexes bridged by 1, 2, 4-triazole have been poorly studied[3]. Recently, we have prepared a series of silver(I) triazole complex…     

十八烷基取代吲哚啉螺吡喃衍生物的合成及光谱性质

本文合成了十种新的十八烷基取代的吲哚螺吡喃衍生物,拟进一步研究这类化合物在LB膜中的光致变色性质.     

新型二氢色原酮拼接多环吡咯螺环氧化吲哚类化合物的 无催化剂合成及其抗白血病活性

以取代的3-羧酸活化色酮、靛红与消旋脯氨酸为原料，乙腈为溶剂，依次经1,3-偶极子[3+2]环加成和脱羧反应，合成了8个新型的二氢色原酮拼接多环吡咯螺环氧化吲哚类化合物 (3a~3h)，产率68%~87%, dr值15/1~20/1,其结构经¹H NMR, ¹³C NMR和HR-MS（ESI-TOF）表征。采用MTT法研究了3a~3h对人白血病细胞(K562)的体外抑制活性。结果表明：化合物3d,3f, 3g对K562具有一定的抑制活性(IC₅₀=46.3~69.4 μmol·L^-1)。     

吲哚并喹嗪衍生物的立体选择性合成

用锂铝氢四还原卟啉得到卟啉醇,它与甲乙酮反应得相应的羟甲基氨基酮,在相转移条件下,它能被转化成光学纯吲哚并喹嗪衍生物.列出了环化机理的反应流程.     

烟碱分子烙印聚合物的吸附特性

利用分子烙印技术，以烟碱为烙印分子，甲基丙烯酸(MAA)为功能单体，乙二醇二甲基丙烯酸酯(EDMA)为交联剂，合成了对烟碱具有特异性作用的分子烙印聚合物P(Nic)；通过平衡吸附实验，评价了其对烟碱的亲和力和选择性。与非烙印聚合物相比，P(Nic)对烟碱表现了很高的亲和力；Scatchard分析表明在P(Nic)中存在对烟碱有不同的亲和力的两类作用位点。通过与氨基吡啶类物质在P(Nic)上的吸附行为比较，表明P(Nic)对烟碱具有很好的选择性。本工作证明了用P(Nic)作为固相萃取(SPE)材料选择性地从烟草烟雾中提取烟碱的可能性。     

Preparation of Diphenyl Oxalate from Transesterification of Dimethyl Oxalate with Phenol over TS—1 Catalyst

Diphenyl oxalate was synthesized from transesterification of dimethyl oxalate with phenol over TS-1(2.5 wt% Ti)catalyst.TS-1 catalyst,as a beterogeneous catalyst,showed excellent selectivity of diphenyl oxalate and methylphenyl oxalate compared with other homogeneous catalysts.Lewis acid sites on TS-1 catalyst were the active sites for transesterification of dimethyl oxalate with phenol.the high selectivity was closely related to the weak acid sites over TS-1.