947 resultados para Dimethyl ether (DME)
Resumo:
High resolution transmission electron microscope (HREM) was used to observe the rigid chain polymer poly(aryl-ether-ketone) (PEK), so as to study the morphology of the crystals and molecular arrangement within a crystal.Many kinds of material crystal structures have been studied with HREM in recent years. So far as polymeric materials are concerned, the application of HREM
Resumo:
我们曾测定NdCl_3·4THF的晶体结构,并研究了它对双烯烃聚合的活化作用.本文报导含二甲氧基乙烷(Dimethoxyethane,简称DME)的SmCl_3(DME)·2THF的制备及其单晶结构,以利于对稀土催化双烯烃聚合反应机理作出更好的解释.
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在稀土有机化学中,[Cp_2LnCl]_2和[Cp_2LnCl_2LiL_2][Cp为取代或未取代的环戊二烯基,Ln为稀土离子(III),L为Lewis碱]型化合物是重要的中间物。对含锂烷基、芳基或烯丙基稀土化合物的研究也有着重要的意义。这类分子中含有型桥键结构。由于这类化合物难于结晶及其不稳定性,故很难进行系统的研究。 Rossmanith首先发现了NdCl_3-LiCl-THF溶液的存在。李毅用这一溶液很方便地合成了几个轻稀土-锂双金属有机化合物。但是,在稀土配位化学中,对氯化稀土-氯化锂配合物的研究还很少,对LnCl_3LiCl-THF溶液的认识也有待深化。本文合成了组成为(LaCl)DME(μ_2-Cl)_5(μ_3-Cl)(La·DME)Li(THF)_2的新型桥式链状配合物,并测定了晶体结构。这种类型的稀土双金属配合物尚未见报道。
Resumo:
海洋是一个巨大的天然产物宝库,约占地球表面积70%的海洋蕴藏着80%的生物资源。由于海洋生态环境的特殊性,导致海洋生物能够产生大量结构独特多变和活性特殊多样的代谢产物。我国海域辽阔,海洋资源丰富,为寻找结构新颖、生理活性独特的先导化合物,加强对海洋资源的开发利用,本论文对中国沿海的三种海洋红藻和两株放线菌次生代谢产物以及生物活性进行研究,为新药研究与开发提供模式结构和药物前体。 对红藻似瘤凹顶藻Laurencia similis乙酸乙酯萃取物进行分离纯化,从中得到单体化合物35个,通过波谱学方法(IR、MS、NMR等)鉴定了他们的结构。分别为:2, 2, 5, 5, 6, 6-sixibromo-3, 3-bi-1H-indole (1),3,5-dibromo- 1-methyl-indole (2),3',5',6,6'-tetrabromo-2,4-dimmethyldiphenyl ether (3),1,2,5- tribromo-3-bromoamino-7-bromomethylnaphthalene (4),2,5,8-tribromo-3-bromo- amino-7-bromomethylnaphthalene (5),2,5,6-tribromo-3-bromoamino-7-bromo- methylnaphthalene (6), 2,5,6,5',6'-pentabromo-3,4,3',4'-tetramethoxybenzophenone (7), (4E)-1-bromo-5-[(1'S*,3'R*)-3'-bromo-2',2'-dimethyl-6'-methylenecyclohexyl] -3-methylpent-4-ene-2,3-diol (8),4-hydroxy-Palisadin C (9),Isopalisol (10),Luzonensol (11),Palisadin B (12),Aplysistatin (13),Palisadin A (14),5-Acetoxypalisadin B (15),Aristolan-1(10)- en-9-ol (16),Aristol-8-en-1-one (17),Aristolan-9-en-1-one (18),Aristolan-1(10)-en- 9-one (19),Aristofone (20),Aristolan-1(10)-8-diene (21),Aristolan-1,9-diene (22),10-Hydroxyaristolan-9-one (23),7,11,15-trimethyl-3-methylene-hexadecan-1,2-diol (24),3β-Hydroxyergosta- 5,24(28)-dien-7-one (25),Isofucosterol (26),β-sitosterol (27),豆甾-4-烯-3α,6β-二醇 (28),Cholesta-5-en-3β-ol (29),Stigmasterol (30),2,3,5,6-四溴-吲哚 (31),2,3,6-tribromo-1H-indole (32),3,5,6-tribromo-1-methylindole (33),3,5,6-tribromo -1H-indole (34),2,3,5-tribromo-1-methylindole (35),其中化合物1-9为新化合物,化合物10-15、20和化合物24-30均为首次从该种海藻中得到。对新化合物1-9进行PTP1B酶抑制剂活性筛选,新化合物1、3、7显示强的PTP1B酶抑制活性。 对红藻齐藤凹顶藻Laurencia saitoi乙酸乙酯萃取物进行分离纯化,从中得到单体化合物11个,通过波谱学方法(IR、MS、NMR等)鉴定了他们的结构,分别为:2-hydroxyl-Luzofuranone (1),2-hydroxyl-Luzofuranone B (2),4-hydroxyl-Palisudin C (3),2-bromo-γ-ionone (4),Aplysistatin (5),5-Acetoxypalisadin B (6),Palisadin B (7),Palisadin A (8),Pacifigorgiol (9),豆甾-4-烯-3α,6β-二醇 (10),2, 3, 5, 6-四溴-吲哚 (11),其中化合物1-4为新化合物,所有化合物均为首次从该种海藻中得到。通过MTT法对分离得到的新化合物1-4进行肿瘤细胞毒活性筛选,结果显示4个新化合物对所测肿瘤细胞株均无明显的活性。 对红藻瘤状软骨凹顶藻Chondrophycus papillous乙酸乙酯萃取物进行分离纯化,从中得到单体化合物5个,通过波谱学方法(MS、NMR等)鉴定了他们的结构,分别为邻苯二甲酸二丁酯 (1),邻苯二甲酸二异辛酯 (2),胆甾醇 (3),3,7,11,15-tetramethyl-hexadec-2-en-1-ol (4),4-羟基苯甲醛 (5),所有化合物均为首次从该种海藻中得到。 对海洋放线菌M159乙酸乙酯萃取物进行分离纯化,从中得到单体化合物13个,通过波谱学方法(MS、NMR等)鉴定了他们的结构,分别为:5-(4',6'-dihydroxy-6-methyloctyl)furan-2(5H)-one (A),phenethyl alcohol (1),4-羟基苯甲醛(2),anthranilic acid (3),4-Hydroxy-3-methoxy- phenyl-propionic acid (4),5-(6,7-dihydroxy-6-methyloctyl)furan-2(5H)-one (5),p-Hydroxyphenylethyl alcohol (6),3-Indoleacrylic acid (7),Indol-3-carboxylic acid (8),Adenine cordyceposide (9),腺嘌呤核苷(10),尿嘧啶核苷(11),Thymidine (12),其中化合物A为新化合物。所有化合物均为首次从该株放线菌中得到。 对海洋放线菌L211乙酸乙酯萃取物进行分离纯化,从中得到单体化合物15个,通过波谱学方法(MS、NMR等)鉴定了7个结构,分别为:spatozoate (1),anthranilic acid (2),3-Indolylethanol (3),1-Acetyl-β-carbolin (4),p-Hydroxyphen- ylethyl alcohol (5),Indole-3-acetic acid (6),Indol-3-carboxylic acid (7),所有化合物均为首次从该株放线菌中得到。
Resumo:
Six new bromophenols, 3-bromo-4,5-bis(2,3-dibromo-4,5-dihydroxybenzyl)pyrocatechol (1), 2,2',3-tribromo-3',4,4',5-tetrahydroxy-6'-hydroxymethyldiphenylmethane (2), 2,2',3-tribromo-3',4,4',5-tetrahydroxy-6'-ethyloxymethyldiphenylmethane (3),(+/-)-2-methyl-3-(2,3-dibromo-4,5-dihydroxyphenyl)propylaldehyde (4), (+/-)-2-methyl-3-(2,3-dibromo-4,5-dihydroxyphenyl)propylaldehyde dimethyl acetal (5), and 3-bromo-4,5-dihydroxybenzoic acid methyl ester (6), together with eight known bromophenols, 3-bromo-4,5-dihydroxybenzaldehyde (7), 2,3-dibromo-4,5-dihydroxybenzyl alcohol (lanosol, 8), 2,3-dibromo-4,5-dihydroxybenzyl methyl ether (9), 2,3-dibromo-4,5-dihydroxybenzyl ethyl ether (10), 2,3-dibromo-4,5-dihydroxybenzylaldehyde (11), bis(2,3-dibromo-4,5-dihydroxybenzyl) ether (12), 3-bromo-4-(2,3-dibromo-4,5-dihydroxybenzyl)-5-methoxymethylpyrocatechol (13), and 2,2',3,3'-tetrabromo-4,4',5,5'-tetrahydroxydiphenyl methane (14), were isolated from the red alga Rhodomela confervoides. Their structures were elucidated by chemical and spectroscopic methods including IR, HRFABMS, and 1D and 2D NMR techniques.
Resumo:
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-dibromo-4,5-dihydroxyphenyl) propylaldehyde dimethyl acetal and 3-bromo-4,5-dihydroxybenzoic acid methyl ester by spectroscopic techniques including IR, HRFABMS, ID and 2DNMR experiments.