The γ-rays and protons from an Ed = 20 keV deuteron beam incident on a D-Ti target were measured. A branching ratio of the 2H（d,γ）^4He reaction versus the ^2H（d,p）^3H reaction of Гγ/Гp = （1.061 0.34） x 10.7...The γ-rays and protons from an Ed = 20 keV deuteron beam incident on a D-Ti target were measured. A branching ratio of the 2H（d,γ）^4He reaction versus the ^2H（d,p）^3H reaction of Гγ/Гp = （1.061 0.34） x 10.7 has been obtained, and the astrophysical S factor of the ^2H（d,γ）He reaction at the center of mass energy Ecm ≈ 7 keV of （6.0±2.4） ×10^6 keV.b was deduced.展开更多
Two compounds,3-oxo-N-o-tolylbenzo[d]isothiazole-2（3H）-carboxamide （1） and N-（2-methoxyphenyl）-3-oxobenzo[d]isothiazole-2（3H）-carboxamide （2）,were synthesized from the initial compound benzo[d]isothiazol-3...Two compounds,3-oxo-N-o-tolylbenzo[d]isothiazole-2（3H）-carboxamide （1） and N-（2-methoxyphenyl）-3-oxobenzo[d]isothiazole-2（3H）-carboxamide （2）,were synthesized from the initial compound benzo[d]isothiazol-3（2H）-one （BIT） and characterized by 1 H NMR,IR and elemental analysis,respectively.The single crystals of compounds 1 and 2 were obtained and determined by X-ray diffraction analysis.The preliminary results of biological activity experiment show that some of the title compounds exhibited a favorable antimicrobial activity.展开更多
Starting from 2-imino-N-phenyl-2H-chromene-3-carbox-amide, (1) a series of functionalized chromenes were achieved;such as, 2-ethoxy-2,3-dihydro-3-phenylchromeno[2,3-d]pyrimidin-4-one (2), and 2-hydrazinyl-2,3-dihydro-...Starting from 2-imino-N-phenyl-2H-chromene-3-carbox-amide, (1) a series of functionalized chromenes were achieved;such as, 2-ethoxy-2,3-dihydro-3-phenylchromeno[2,3-d]pyrimidin-4-one (2), and 2-hydrazinyl-2,3-dihydro-3-phenylchromeno-[2,3-d]pyrimidin-4-one (3). Furthermore, reactions of (3) with some of laboratory available compounds gave pyrazoles (4-9, 12, 13a, 13b), tetrazoles (11), 2-(2-benzylidenehydrazinyl)-3-phenyl-3H-chromeno[2,3-d]pyrimidin4(10H)-oneisoxazoles (14), 5-chloro-1-(4-oxo-3-phenyl-4,10-dihydro-3H-chromeno[2,3-d]pyrimidin-2-yl)-3-phenyl-2, 3-dihydro-1H-pyrazole-4-carbonitrile (17), pyrimidines (28a, b), pyridines (29a-29e, 30, 33a, 33b), benzo[b][1, 4]oxazepin-2- amines (32a, b), 3-chloro-4-(2-imino-2H-chromen-3-yl)-1-phenyl-4-(phenylamino) azetidin-2-one (34a-34e) and 2-(2- imino-2H-chromen-3-yl)-3-phenyl-2-(phenyl amino)thiazolidin-4-onee (35a-35e). The structures of these compounds were established by elemental analysis, IR, MS and NMR spectral analysis.展开更多
A series of 8,9-dihydro-2-（2-oxo-2H-chromen-3-yl）-5-aryl-3H-chromeno[2,3-d]pyrimidine-4,6（5H^7H）-diones （Sa-j）have been synthesized by the reaction of 2-amino-5,6,7,8-tetrahydro-5-oxo-4-aryl-4H-chromene-3-carbon...A series of 8,9-dihydro-2-（2-oxo-2H-chromen-3-yl）-5-aryl-3H-chromeno[2,3-d]pyrimidine-4,6（5H^7H）-diones （Sa-j）have been synthesized by the reaction of 2-amino-5,6,7,8-tetrahydro-5-oxo-4-aryl-4H-chromene-3-carbonitrile （4a-j） with couma- rin-3-catboxylic acid under neat conditions employing Brnsted acidic ionic liquid （4-sulfobutyl）tris（4-sulfophenyl）phosphonium hydrogen sulfate as catalyst. Structures of all the compounds were established on the basis of analytical and spectroscopic data. All the compounds were evaluated for their in vitro antimicrobial activity against different bacterial and fungal strains.展开更多
文摘The γ-rays and protons from an Ed = 20 keV deuteron beam incident on a D-Ti target were measured. A branching ratio of the 2H（d,γ）^4He reaction versus the ^2H（d,p）^3H reaction of Гγ/Гp = （1.061 0.34） x 10.7 has been obtained, and the astrophysical S factor of the ^2H（d,γ）He reaction at the center of mass energy Ecm ≈ 7 keV of （6.0±2.4） ×10^6 keV.b was deduced.
基金Supported by the National Natural Science Foundation of China (No. 20962007)the Creative Talents Plan of Hainan University 211 Project
文摘Two compounds,3-oxo-N-o-tolylbenzo[d]isothiazole-2（3H）-carboxamide （1） and N-（2-methoxyphenyl）-3-oxobenzo[d]isothiazole-2（3H）-carboxamide （2）,were synthesized from the initial compound benzo[d]isothiazol-3（2H）-one （BIT） and characterized by 1 H NMR,IR and elemental analysis,respectively.The single crystals of compounds 1 and 2 were obtained and determined by X-ray diffraction analysis.The preliminary results of biological activity experiment show that some of the title compounds exhibited a favorable antimicrobial activity.
文摘Starting from 2-imino-N-phenyl-2H-chromene-3-carbox-amide, (1) a series of functionalized chromenes were achieved;such as, 2-ethoxy-2,3-dihydro-3-phenylchromeno[2,3-d]pyrimidin-4-one (2), and 2-hydrazinyl-2,3-dihydro-3-phenylchromeno-[2,3-d]pyrimidin-4-one (3). Furthermore, reactions of (3) with some of laboratory available compounds gave pyrazoles (4-9, 12, 13a, 13b), tetrazoles (11), 2-(2-benzylidenehydrazinyl)-3-phenyl-3H-chromeno[2,3-d]pyrimidin4(10H)-oneisoxazoles (14), 5-chloro-1-(4-oxo-3-phenyl-4,10-dihydro-3H-chromeno[2,3-d]pyrimidin-2-yl)-3-phenyl-2, 3-dihydro-1H-pyrazole-4-carbonitrile (17), pyrimidines (28a, b), pyridines (29a-29e, 30, 33a, 33b), benzo[b][1, 4]oxazepin-2- amines (32a, b), 3-chloro-4-(2-imino-2H-chromen-3-yl)-1-phenyl-4-(phenylamino) azetidin-2-one (34a-34e) and 2-(2- imino-2H-chromen-3-yl)-3-phenyl-2-(phenyl amino)thiazolidin-4-onee (35a-35e). The structures of these compounds were established by elemental analysis, IR, MS and NMR spectral analysis.
文摘A series of 8,9-dihydro-2-（2-oxo-2H-chromen-3-yl）-5-aryl-3H-chromeno[2,3-d]pyrimidine-4,6（5H^7H）-diones （Sa-j）have been synthesized by the reaction of 2-amino-5,6,7,8-tetrahydro-5-oxo-4-aryl-4H-chromene-3-carbonitrile （4a-j） with couma- rin-3-catboxylic acid under neat conditions employing Brnsted acidic ionic liquid （4-sulfobutyl）tris（4-sulfophenyl）phosphonium hydrogen sulfate as catalyst. Structures of all the compounds were established on the basis of analytical and spectroscopic data. All the compounds were evaluated for their in vitro antimicrobial activity against different bacterial and fungal strains.
