共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
5.
6.
2-(1H-1,2,4-三唑-1-基)-4,4-二甲基-1-烃硫基-3-戊酮的合成及波谱性质 总被引:2,自引:0,他引:2
由 2 - (1H - 1 ,2 ,4-三唑 - 1 -基 ) - 4 ,4-二甲基 - 1 -戊烯 - 3 -酮和硫酚 (醇 )亲核加成反应合成了五个未见文献报道的目标化合物 ,其化学结构经IR、1 HNMR、MS和元素分析确证并研究其波谱性质 相似文献
7.
8.
9.
10.
设计合成了1-乙酰基-3-(2-羟基-4,6-二甲氧基苯基)-5-苯基-2-吡唑啉(4), 测试了其紫外光谱和荧光光谱, 研究了其对锌离子的选择性识别作用. 结果表明, 化合物4作为锌离子荧光探针, 受常见离子的干扰较小, 对于锌离子有着较高的选择性和较低的检出限. 相似文献
11.
The fragmentation behavior of taxoids was studied using electrospray (ESI) and atmospheric pressure chemical ionization (APCI) sources with multi-stage tandem mass spectrometry. In the positive ion mode taxoids gave prominent [M+Na]+ and [M+K]+ ions with the ESI source, and [M+NH4]+ or [M+H]+ ions with the APCI source. The MS/MS fragmentations of ions produced by APCI and ESI sources were very similar. For both sources, the presence of cinnamoyl or benzoyl groups could be characterized by initial losses of 148 or 122 u, respectively, from molecular adduct ions. However, the elimination of cinnamic acid was relatively difficult for the molecular adduct ions formed by APCI, and was comparable in importance to the loss of acetic acid. The other fragments involved losses of CH2CO, CO, and H2O. The 5/7/6 type taxoids underwent characteristic losses of 58 or 118 u from ions produced by both APCI and ESI sources. The fragmentation behavior was remarkably influenced by substitution locations. The elimination of the C-10 benzoyl group was usually the first fragmentation step, while that of the C-2 benzoyl group was relatively difficult. The acetoxyl group at C-7 was more active than those at C-2, C-9, and C-10, which in turn were more active than that at C-4. These fragmentation rules could facilitate the rapid screening and structural characterization of taxoids in plant extracts by high-performance liquid chromatography/mass spectrometry (HPLC/MS). 相似文献
12.
13.
14.
对烷氧基苯基苯并卟啉的新法合成及性能研究 总被引:3,自引:0,他引:3
采用先接链后合环密闭熔融新方法,合成了5个系列25种对烷氧基苯基苯并卟啉,通过紫外,红外,质谱和元素分析等手段进行了表征,初步研究了10种新型卟啉的性能。 相似文献
15.
Peng H Reverdy P Khabashesku VN Margrave JL 《Chemical communications (Cambridge, England)》2003,(3):362-363
Single-wall carbon nanotubes (SWNTs) and their fluorinated derivatives (F-SWNTs) were reacted with organic peroxides including benzoyl and lauroyl peroxide to produce phenyl and undecyl sidewall functionalized SWNTs, respectively, which were characterized by Raman, FTIR, and UV-Vis-NIR spectra as well as TGA/MS, TGA/FTIR, and TEM data. 相似文献
16.
合成了5种11-脱氧甘草次酸3-单糖链皂苷并初步探讨其生物活性.以苯甲酰基保护的糖基三氯乙酰亚胺酯为供体,在三氟甲磺酸三甲基硅脂(TMSOTf)的催化作用下与11-脱氧甘草次酸乙酯C(3)位羟基发生糖苷化反应,以较好的产率制备得苯甲酰基保护的11-脱氧甘草次酸乙酯3-单糖链皂苷7a~7e,用NaOMe/MeOH溶液脱除苯甲酰基得11-脱氧甘草次酸乙酯3-单糖链皂苷8a~8e.合成的5个11-脱氧甘草次酸3-单糖链皂苷均为新化合物,结构经1H NMR、质谱、元素分析确证,活性实验表明化合物8a对高浓度N,N-二甲基甲酰胺(DMF)中枯草芽孢杆菌的生长具有保护作用,化合物8e对高浓度DMF中大肠杆菌、酵母菌的生长具有保护作用. 相似文献
17.
Mei Ren Yun Gen Xu Na Wen Da Yong Zhang Wei Yi Hua 《中国化学快报》2007,18(5):539-541
A series of novel derivatives of ligustrazine linked with substituted benzoyl guanidine were synthesized. These compounds have not been reported in literature, and their chemical structures were confirmed by IR, 1H NMR and MS. The results of NHE1 inhibitory activity test showed that compounds I2, I3, I4, I6, and I7 possess more potent NHE1 inhibitory activity than cariporide. 相似文献
18.
19.
以2,5-二巯基-1,3,4-噻二唑为原料, 与水合肼缩合, 生成2,5-二肼基-1,3,4-噻二唑. 2,5-二肼基-1,3,4-噻二唑与苯甲酰氯反应生成2,5-二酰肼基-1,3,4-噻二唑, 以POCl3为环合剂环合酰肼基-1,3,4-噻二唑, 合成3,6-二取代苯基- 二-1,2,4-三唑并[3,4-b]-1,3,4-噻二唑衍生物, 合成的新化合物的结构通过元素分析、红外光谱、核磁共振氢谱和质谱予以证实, 并提出了环化反应机理. 相似文献
20.
为了寻找新的含噻唑杂环的先导化合物,利用¨(2-氰基亚胺基-1,3-噻唑烷-3-基)甲基]-2-氨基噻唑与取代苯甲酰氯(或乙酰氯)在吡啶存在下发生缩合反应,合成了19个新型含2-取代-1,3-噻唑烷环的噻唑酰胺类化合物4.经1HNMR和元素分析对目标化合物的结构进行了表征,经MS进一步证实了化合物4s的结构,并通过X射线单晶衍射分析测定了化合物4a的晶体结构.对所合成的目标化合物进行了生物活性测试,部分化合物表现出一定的杀菌和植物生长调节活性. 相似文献