全文获取类型
收费全文 | 96篇 |
免费 | 6篇 |
国内免费 | 2篇 |
专业分类
化学 | 89篇 |
数学 | 3篇 |
物理学 | 12篇 |
出版年
2022年 | 2篇 |
2021年 | 7篇 |
2020年 | 6篇 |
2019年 | 5篇 |
2018年 | 2篇 |
2017年 | 2篇 |
2016年 | 6篇 |
2014年 | 1篇 |
2013年 | 10篇 |
2012年 | 3篇 |
2011年 | 4篇 |
2010年 | 5篇 |
2009年 | 3篇 |
2008年 | 3篇 |
2007年 | 9篇 |
2006年 | 8篇 |
2005年 | 7篇 |
2003年 | 6篇 |
2002年 | 3篇 |
2001年 | 1篇 |
1999年 | 4篇 |
1997年 | 1篇 |
1995年 | 1篇 |
1990年 | 1篇 |
1985年 | 2篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有104条查询结果,搜索用时 31 毫秒
1.
2.
Balkis Al‐Saleh Morsy Ahmed El‐Apasery Rasha Safwat Abdel‐Aziz Mohamed Hilmy Elnagdi 《Journal of heterocyclic chemistry》2005,42(4):563-566
The 3‐anilinoenones 3a,b were prepared from the corresponding 3‐dimemyl‐aminopropenones. The reactivity of 3a,b towards a variety of carbon and nitrogen nucleophiles as well as naphthoquinones is reported. 相似文献
3.
Franz A. Mautner Christian Gspan Mohamed A. S. Goher Morsy A. M. Abu-Youssef 《Monatshefte für Chemie / Chemical Monthly》2005,17(6):107-117
Four new polynuclear complexes: [Zn(2picNO)(N3)2]n, [Zn(4Mepym)(N3)2]n, [Cd(2picNO)(N3)2]n, and [Cd(4Mepym)(N3)2]n (2picNO=2-picoline-N-oxide and 4Mepym=4-methylpyrimidine) have been synthesized and characterized by single-crystal X-ray diffraction. The structures of the zinc(II) complexes feature five-coordinate zinc atoms, (-1,1) azido bridges, monodentate organic ligands, and 1D chains. The cadmium(II) azide complexes contain distorted octahedral metal atoms linked by alternate di-(-1,1) and di-(-1,3) azido bridges in cis arrangement and these chains are connected by 2picNO bridges giving a honeycomb 2D framework or by 4Mepym bridges forming extended 2D network structure. 相似文献
4.
Goher Mohamed A. S. Abdou Azza E. H. Abu-Youssef Morsy A. M. Mautner Franz A. 《Transition Metal Chemistry》2001,26(1-2):39-43
Two new copper(II) azido complexes, namely bis-(tetraethylammonium)[tetraazidocuprate(II)] (1) and catena-di--1,1-azido-[di--1,1-azido-bis-(2,4-dimethylpyridine)dicopper(II)] (2), have been prepared and characterized by spectroscopic and crystallographic methods. Complex (1) consists of isolated NEt+
4 cations and [Cu(N3)4]2– anions. The site symmetry around the copper atom in the anion is 4/m. Complex (2) features a 1 D chain structure, five coordinated square pyramidal copper(II) atoms with both azides functioning as -1,1-bridges. The i.r. spectra reveal that both complexes contain asymmetric azido ligands. The solid and solution electronic spectra of (1) and (2) show very strong absorption bands in the visible region associated with N–
3 CuII charge-transfer transitions. The e.p.r. spectra of powder samples and solutions at room temperature were recorded and discussed. 相似文献
5.
Journal of the Iranian Chemical Society - Utility of 4-oxo-6-styryl-2-thioxo-1,2,3,4-tetrahydropyrimidine-5-carbonitrile 1 in synthesis of a new series of fused pyrimidines was described.... 相似文献
6.
Saleh Al-Mousawi Abdel-Zaher Elassar Morsy Ahmed El-Apasery 《Phosphorus, sulfur, and silicon and the related elements》2013,188(8):1755-1771
Heating diazoaminobenzene with active methylene compounds 1–3 in microwave oven in acetic acid, in the presence of hydrochloric acid, afforded the corresponding arylhydrazones 5–7. These reaction products were condensed with ethyl cyanoacetate in a domestic microwave oven after 1–2 minutes heating to yield the pyridazinones 8–12. Compounds 8c and 12 reacted with sulfur in basic DMF solution, in microwave oven using MORE technology to yield the thienopyridazinone 14 and 16 respectively. While 17 was produced when 8b was treated like wise with sulfur and DMF in the presence of piperidine. Compounds 16 coupled with aromatic diazonium salts to yield arylazo derivatives 21a–c. 相似文献
7.
The novel 2-(1H)-pyridone, the lead compound of the pyridone derivative 1, reacted with an electrophilic reagent (ethyl chloroacetate) to give the corresponding ester 2. Condensation of compound 2 with thiosemicarbazide and/or hydrazine hydrate afforded the mercaptotriazole and the corresponding acetic acid hydrazide derivatives 3 and 4, respectively. The latter compound reacted with ethyl acetoacetate, ethyl cyanoacetate, and maleic anhydride to give compounds 5, 6, and 7, respectively. Alkylation of compound 3 with methyl iodide or chloroacetic acid afforded methylsulfanyltriazole and thiazolotriazole derivatives 8 and 9, respectively. Compound 8 reacted with glycine to afford the imidazotriazole derivative 10. Both compounds 9 and 10 reacted with glucose and benzaldehyde to give compounds 11, 12, 13, and 14, respectively. Some of the prepared products were selected and subjected to screening for their antioxidant activity. 相似文献
8.
Eman A. E. El-Helw Alaa R. I. Morsy Ahmed I. Hashem 《Journal of heterocyclic chemistry》2021,58(4):1003-1014
The hydrazide obtained from furan-2(3H)-one integrated with a quinolin-2(1H)-one core reported previously by our research group was utilized as a building block synthon to obtain some pyrrolone, pyridazinone, oxadiazole, and triazole derivatives through treating with some carbon electrophilic reagents, for example, chloroacetyl chloride, benzoyl chloride, acetic anhydride, carbon disulfide, 3,4-dimethoxybenzaldehyde, and 2-oxoquinolin-3-carbaldehyde to achieve the target heterocycles. The newly synthesized compounds were evaluated as immunomodulator against highly pathogenic avian influenza virus (H5N8). The compounds 1 , 11 , and 17 displayed the highest potency (100% protection). 相似文献
9.
Shrouk M. Hassan Jehan M. Morsy Hany M. Hassanin Elham S. Othman 《Journal of heterocyclic chemistry》2021,58(1):305-314
A novel series of 6-alkyl-4-bromopyrano[3,2-c]quinoline-2,5-diones ( 2a–c ), 6-alkyl-3,4-dibromopyrano[3,2-c]quinoline-2,5-diones ( 4a–c ), and 6-alkyl-3-amino-bromopyrano[3,2-c]quinoline-2,5-diones ( 6a–c ) were synthesized via appropriate conventional methods and in good yields. The structures of target compounds were approved by elemental analysis, IR, 1H NMR, 13C NMR, and mass spectrometry. The antitumor inhibitory activities of the new compounds were evaluated on several cancer cell lines, A-549 (human lung cancer), HCT-116 (human colon cancer), MCF-7 (breast cancer), and HePG-2 (human liver cancer). Moreover, 50% inhibitory concentrations, IC50, were established. 5-Fluorouracil was used as a positive control in the viability assay. The screening results showed that most of the examined compounds exposed powerful inhibition activity toward various cell lines. Particularly, Compound 4c exhibited higher cytotoxic activity against four tumor cell lines than the reference drug, 5-fluorouracil, with significantly lower IC50 values. Accordingly, most of the synthesized compounds would be a better prospective growth in the anticancer drug discovery. 相似文献
10.
Youssef Walid Mohamed El Sheikh Ahmed Said Ahmed Sherien Hussien Morsy Ahmed Morsy Ahmed 《Journal of Radioanalytical and Nuclear Chemistry》2020,324(1):87-96
Journal of Radioanalytical and Nuclear Chemistry - Polyacrylic acid/polyaniline composite (a three-dimensional cross-linked hydrophilic chelating polymeric sorbent) was improved for promoted... 相似文献