Synthesis, Crystal Structure, Physical Properties, and Application of a Series of Functional Dibenzo[d,f][1,3]dioxepine Derivatives

The twisted aromatics, functional dibenzo[d,f][1,3]dioxepine derivatives were synthesized in high yields from reactions of 5,5＇-dibromo-2,2＇-biphenol with corresponding ketal or ketone compounds under acid catalysis. The structures of these compounds were characterized by ^1H NMR, elemental analysis, UV-Vis absorption spectrum and X-ray diffraction analysis. The conformation of O--C--O bridged biphenyl derivatives with varied substitute groups on 6,6＇-position was studied by X-ray crystallography and force-field simulation. The result of calculations by UNIVERSAL 1.02 force field in Cerius2 package（4.6） indicates that dibenzo[d,f][1,3]dioxepine derivatives show twisted conformations and the twisted angle between the phenyl rings is about 40°, which is accordant with the result from crystal structure determination, though the obtained angles in the crystal of dibenzo[d,f][1,3]dioxepine derivatives with the varied substitute groups on 6,6＇-position are shown to be slightly shifted to 40° owing to intermolecular interactions in crystal stacking. DSC studies exhibit that the substitute groups on 6,6＇-position can induce a large variation of endothermic peaks ranging from 80 to 135 ℃. The conjugated polymers based on dibenzo[d,f][1,3]dioxepine derivatives, which have ultraviolet emitting with a quantum efficiency of 10%, were obtained by Yamamoto coupling.

1,3-二醇酯为内给电子体的丙烯聚合催化剂

研究了1,3-二醇酯为内给电子体的丙烯聚合ND-01系列催化剂的活性、氢调敏感性、定向性及动力学行为。实验结果表明,ND-01系列催化剂的活性较高;定向性易调;不加外给电子体时,所得聚丙烯的等规度也可达94.2%;与不同外给电子体配合使用的ND-01系列催化剂的性能与现有以邻苯二甲酸二丁酯为内给电子体的催化剂A的性能有较大的不同,使用二异丙基二甲氧基硅烷为外给电子体时,ND-01系列催化剂的氢调敏感性比催化剂A好,聚合所得聚丙烯的相对分子质量分布较宽;动力学行为实验结果表明,ND-01系列催化剂的活性衰减较慢。ND-01系列催化剂与三乙基铝/环己基甲基二甲氧基硅烷进行预络合反应时,ND-01系列催化剂中1,3-二醇酯的损失量小于催化剂A中邻苯二甲酸二丁酯的损失量。延长预络合时间,ND-01系列催化剂的聚合活性下降。

Z-N型催化剂——2,2-二异丁基-1,3-丙二醇二氯代苯甲酸酯衍生物的合成及其催化活性

以丙二酸二乙酯和氯代苯甲酰氯为原料,经烷基化、酯还原和酰化反应合成了四个新型的Z-N型催化剂——2,2-二异丁基-1,3-丙二醇二苯甲酸酯衍生物(4a^4d),总收率73%~80%,其结构经1H NMR表征。以合成聚丙烯为探针反应,考察4a^4d的催化活性。结果表明,4a^4d具有较好的催化活性,在苯环上引入氯可以显著提高催化剂的催化活性而不影响其他性能,且当氯处于羧基间位时,催化活性最佳。

二苯并-1,3-二氧杂-环辛烷-2-羧酸丙酮肟酯的合成及其除草活性

二苯并-1,3-二氧杂-环辛烷-2-羧酸丙酮肟酯(SYP-185)是沈阳化工研究院正在进行前期开发的除草剂。由二苯并-1,3-二氧杂-环辛烷-2-羧酸经两步反应制得,总收率70%。其结构经红外、核磁共振谱和元素分析确证。标题化合物在100 g a.i./hm2剂量下可防多种杂草;在300 g a.i./hm2对小麦安全。

区域选择性合成二苯并[d,f][1,3]二噁烷

针对二苯并[d,f][1,3]二噁烷传统制备方法中易产生二羟基联苯乙烯副产物的缺点,本文以路易斯酸性胍盐离子液体为催化剂,2,2'-二羟基联苯和端基炔为原料,高区域选择性的合成了二苯并[d,f][1,3]二噁烷,收率39%～84%。本方法适用于各种端基炔。路易斯酸性胍盐离子液体循环利用5次,活性不变。

Synthesis and Crystal Structure of 3,9-Bis(pyridin-2-yl)-2,4,8,10-tetraoxaspiro[5.5]undecane

The title compound 3,9-bis（pyridin-2-yl）-2,4,8,10-tetraoxaspiro[5.5]undecane 4（C17H18N2O4） has been synthesized by the reaction of 2,2-bis（hydroxymethyl）propane-1,3-diol with pyridine-2-carbaldehyde in the presence of p-toluenesulfonic acid,and characterized by IR,1H-NMR and X-ray single-crystal diffraction.The crystal belongs to monoclinic system,space group C2/c with a = 25.133（2）,b = 5.7219（5）,c = 21.942（2）（A°） ,β = 99.145（2）°,V = 3115.3（5）（A°）^3,Z = 8,Dc = 1.340 g/cm^3,Mr = 314.33,F（000） = 1328,μ = 0.097 mm-1,MoKa radiation（λ = 0.71073）,R = 0.0352 and wR = 0.1022 for 2486 observed reflections with I 〉 2σ（I）.X-ray analysis reveals that the two 1,3-dioxane rings passing through the central spiro-C atom both adopt chair conformation.Intermolecular C-H…π,C-H…O and C-H…N weak interactions link the molecules to form a three-dimensional samdwich,which are effective in the stabilization of the crystal structure.

Synthesis and Bioactivity of Isosteviol Derivatives: A Facile Method for Preparation of Ent-16α-hydroxy-15β-hydroxymethylbeyeran-19-oic Acid

In this paper, two new compounds, ent-16α-hydroxy-15β-hydroxymethylbeyeran-19-oic acid 4 and its ethyl ester 5 were synthesized in good yield with a facile method that has never been reported. The mechanism of this reaction was discussed and the mono-hydroxymethylation of carbonyl compound with two α-hydrogens via Tollens＇ reaction was firstly achieved. Compounds 2-5 were tested for activity of inhibition against glycosidases, among which 5 displays good inhibition of β-glucosidase and α-mannase, respectively.

Chromium-catalyzed asymmetric synthesis of 1,3-diols

An efficient,chromium-catalyzed highly enantioselective preparation of protected 1,3-diols has been achieved.In the presence of a chiral chromium catalyst using the carbazole-based bisoxazoline as the chiral ligand,a variety of optically pure 1,3-diols were synthesized in 34%-87%yields with up to 98%ee.The benzyl as well as silyl ethers were suitable substitutions for the hydroxyl group.Meanwhile,aromatic,aliphatic and α,β-unsaturated aldehydes are well tolerated under the mild reaction conditions.

BCND催化剂催化丙烯聚合的动力学研究

研究了在常压淤浆聚合条件下聚合温度对以1，3-二醇酯为内给电子体的BCND催化剂的丙烯聚合动力学行为的影响，并与目前工业生产装置上常用的几种以邻苯二甲酸酯为内给电子体的丙烯聚合催化剂进行了比较。实验结果表明，丙烯低温（10～20℃）聚合时，不同催化剂催化丙烯聚合的动力学行为近似，随聚合温度的升高，聚合反应速率增加，与N催化剂和YS-842催化剂相比，BCND催化剂的丙烯聚合活性受聚合温度的影响较小；丙烯在较高温度（70～90℃）聚合时，随聚合温度的升高，BCND催化剂活性中心的衰减速率加快，聚合反应速率下降，但与参比催化剂相比，BCND催化剂催化丙烯聚合的反应速率仍为最大。