A new method is proposed for synthesizing intermediate views from a pair of stereoscopic images. In order to synthesize high-quality intermediate views, the block matching method together with a simplified multi-windo...A new method is proposed for synthesizing intermediate views from a pair of stereoscopic images. In order to synthesize high-quality intermediate views, the block matching method together with a simplified multi-window technique and dynamic programming is used in the process of disparity estimation. Then occlusion detection is performed to locate occluded regions and their disparities are compensated. After the projecton of the left-to-right and right-to-left disparities onto the intermediate image, intermediate view is synthesized considering occluded regions. Experimental results show that our synthesis method can obtain intermediate views with higher quality.展开更多
(-)-Dimethyl(1R,4aS),4a-dimethyl-6-nitro-1,2, 3,4, 4a-pentahydrofluorene-1, 9 -dicarboxylate (1) was synthesized from (R)-(+)-2 -methyl- 2 -(2 -nitrovinyl)-δ-valerolactone(2),which constitutes a formal total Synthesi...(-)-Dimethyl(1R,4aS),4a-dimethyl-6-nitro-1,2, 3,4, 4a-pentahydrofluorene-1, 9 -dicarboxylate (1) was synthesized from (R)-(+)-2 -methyl- 2 -(2 -nitrovinyl)-δ-valerolactone(2),which constitutes a formal total Synthesis of (-)-gibberellin A_(12).展开更多
The key intermediate 5 for synthesis of the contragestationally active diterpenoid grandiflorenic acid(1)and its analogues 2 and 3 was prepared and an acetyl transposition reaction occurred in the SeO_2 oxida- tion of 8.
A key intermediate of cembranolides--(E,E,E,E)- 2,6,10,14- tetramethyl- 8-benzenesulfonyl- 2,6,10,14- tetraen-1,16- hexadecadiol was synthesized from geraniol and linalool through six steps.
An efficient synthesis of functionalized 6-decalone 16, starting from a dienolate anion 3a via a tandem Michael reaction, is described. 16 could be used as a potential intermediate for synthesis of drimane related ses...An efficient synthesis of functionalized 6-decalone 16, starting from a dienolate anion 3a via a tandem Michael reaction, is described. 16 could be used as a potential intermediate for synthesis of drimane related sesquiterpenes.展开更多
Small-sized Pt-based intermetallic compounds(IMCs)with unique electronic and geometrical structures are promising candidates as next-generation oxygen-reduction reaction(ORR)catalysts in protonexchange membrane fuel c...Small-sized Pt-based intermetallic compounds(IMCs)with unique electronic and geometrical structures are promising candidates as next-generation oxygen-reduction reaction(ORR)catalysts in protonexchange membrane fuel cells(PEMFCs).However,the synthesis of IMC catalysts remains challenging owing to the trade-off relation between the alloying/ordering degree and particle aggregation/sintering under a high-temperature annealing process.Herein,we demonstrate a cuprous sulfide(Cu_(1.96)S)intermediate-assisted strategy for the scalable synthesis of PtCu_(3) intermetallic electrocatalysts on an S-doped carbon black support.We identify that the Cu_(1.96)S intermediate formed at low temperature gradually releases metallic Cu species at high temperatures to form a small-sized and uniform Pt-Cu alloy with target stoichiometry,which eventually ensures the formation of well-ordered intermetallic PtCu_(3) structures.The prepared intermetallic PtCu_(3) catalysts exhibit enhanced ORR performance with a mass activity of 3.2 A mg_(Pt)^(-1) and retain 72%of the initial activity after durability tests.展开更多
An efficient method was developed for chlorination of aromatic compounds with electron-donating groups using iodobenzene as the catalyst and m-chloroperbenzoic acid as the terminal oxidant in the presence of 4-methylb...An efficient method was developed for chlorination of aromatic compounds with electron-donating groups using iodobenzene as the catalyst and m-chloroperbenzoic acid as the terminal oxidant in the presence of 4-methylbenzenesulfonic acid in THF at room temperature for 24 h,and a series of the monochlorinated compounds was obtained in good yields.In this protocol,the catalyst iodobenzene was first oxidized into the hypervalent iodine intermediate,which then treated with lithium chloride and finally reacted with aromatic compounds to form the chlorinated compounds.展开更多
The addition of difluorocarbene generated from phenyl(trifluoromethyl)mercury and anhydrous sodium iodide,with trimethylsilyl enol ethers derived from cyclohexanone,cycloheptanone, 3-pentanone and acetophenone was des...The addition of difluorocarbene generated from phenyl(trifluoromethyl)mercury and anhydrous sodium iodide,with trimethylsilyl enol ethers derived from cyclohexanone,cycloheptanone, 3-pentanone and acetophenone was described.The corresponding 2,2-difluoro-1-trimethylsilyloxy- cyclopropanes were obtained in good yields.The thermal stability of these cyclopropyl derivatives was affected by the molecular strain and the nature of their substituents.Thus,1-trimethylsilyloxy- cyclopentene reacted with difluorocarbene to give only 2-fluoro-2-cyclohexen-1-one instead of the expected 1-trimethylsilyloxy-6,6-difluorobicyclo[3.1.0]hexane,and a mechanism for its formation was proposed.展开更多
文摘A new method is proposed for synthesizing intermediate views from a pair of stereoscopic images. In order to synthesize high-quality intermediate views, the block matching method together with a simplified multi-window technique and dynamic programming is used in the process of disparity estimation. Then occlusion detection is performed to locate occluded regions and their disparities are compensated. After the projecton of the left-to-right and right-to-left disparities onto the intermediate image, intermediate view is synthesized considering occluded regions. Experimental results show that our synthesis method can obtain intermediate views with higher quality.
文摘(-)-Dimethyl(1R,4aS),4a-dimethyl-6-nitro-1,2, 3,4, 4a-pentahydrofluorene-1, 9 -dicarboxylate (1) was synthesized from (R)-(+)-2 -methyl- 2 -(2 -nitrovinyl)-δ-valerolactone(2),which constitutes a formal total Synthesis of (-)-gibberellin A_(12).
文摘The key intermediate 5 for synthesis of the contragestationally active diterpenoid grandiflorenic acid(1)and its analogues 2 and 3 was prepared and an acetyl transposition reaction occurred in the SeO_2 oxida- tion of 8.
文摘A key intermediate of cembranolides--(E,E,E,E)- 2,6,10,14- tetramethyl- 8-benzenesulfonyl- 2,6,10,14- tetraen-1,16- hexadecadiol was synthesized from geraniol and linalool through six steps.
文摘An efficient synthesis of functionalized 6-decalone 16, starting from a dienolate anion 3a via a tandem Michael reaction, is described. 16 could be used as a potential intermediate for synthesis of drimane related sesquiterpenes.
基金the National Natural Science Foundation of China(Grants 22221003 and 22071225)the Fundamental Research Funds for the Central Universities(Grant WK2060190103)+3 种基金the Joint Funds from Hefei National Synchrotron Radiation Laboratory(Grant KY2060000175)Collaborative Innovation Program of Hefei Science Center of CAS(Grant 2021HSC-CIP015)USTC Research Funds of the Double First-Class Initiative,the fellowship of China Postdoctoral Science Foundation(2022M712179)the Shenzhen Science and Technology Program(Grant JCYJ20200109110416441).
文摘Small-sized Pt-based intermetallic compounds(IMCs)with unique electronic and geometrical structures are promising candidates as next-generation oxygen-reduction reaction(ORR)catalysts in protonexchange membrane fuel cells(PEMFCs).However,the synthesis of IMC catalysts remains challenging owing to the trade-off relation between the alloying/ordering degree and particle aggregation/sintering under a high-temperature annealing process.Herein,we demonstrate a cuprous sulfide(Cu_(1.96)S)intermediate-assisted strategy for the scalable synthesis of PtCu_(3) intermetallic electrocatalysts on an S-doped carbon black support.We identify that the Cu_(1.96)S intermediate formed at low temperature gradually releases metallic Cu species at high temperatures to form a small-sized and uniform Pt-Cu alloy with target stoichiometry,which eventually ensures the formation of well-ordered intermetallic PtCu_(3) structures.The prepared intermetallic PtCu_(3) catalysts exhibit enhanced ORR performance with a mass activity of 3.2 A mg_(Pt)^(-1) and retain 72%of the initial activity after durability tests.
基金Financial support from the Natural Science Foundation of China (No.21072176)
文摘An efficient method was developed for chlorination of aromatic compounds with electron-donating groups using iodobenzene as the catalyst and m-chloroperbenzoic acid as the terminal oxidant in the presence of 4-methylbenzenesulfonic acid in THF at room temperature for 24 h,and a series of the monochlorinated compounds was obtained in good yields.In this protocol,the catalyst iodobenzene was first oxidized into the hypervalent iodine intermediate,which then treated with lithium chloride and finally reacted with aromatic compounds to form the chlorinated compounds.
文摘The addition of difluorocarbene generated from phenyl(trifluoromethyl)mercury and anhydrous sodium iodide,with trimethylsilyl enol ethers derived from cyclohexanone,cycloheptanone, 3-pentanone and acetophenone was described.The corresponding 2,2-difluoro-1-trimethylsilyloxy- cyclopropanes were obtained in good yields.The thermal stability of these cyclopropyl derivatives was affected by the molecular strain and the nature of their substituents.Thus,1-trimethylsilyloxy- cyclopentene reacted with difluorocarbene to give only 2-fluoro-2-cyclohexen-1-one instead of the expected 1-trimethylsilyloxy-6,6-difluorobicyclo[3.1.0]hexane,and a mechanism for its formation was proposed.
