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In the algebraic setting we prove that if a complex linear group G acts on a Kahler manifold in a symplectically asystatic fashion, then the G-orbits are spherical.
      
The tetra-n-butylammonium cations were accommodated in a zigzag fashion within each channel.
      
The application of level set methods endows the optimization process with the particular quality that topological changes of the boundary, such as merging or splitting, can be handled in a natural fashion.
      
However, this "immunostimulation theory of tumour development" is neither explained in a satisfactory fashion nor universally adopted.
      
We have found that rat liver and heart muscle mitochondria can be uncoupled by low (70 μM) LS concentration in a fashion completely arrested by the ATP/ADP antiporter inhibitor carboxyatractylate (CAtr).
      
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γ-(6-Methoxy-2-carboxy-3,4-dihydro-l-naphthyl)-butyric acid was reduced in the presence of 5% Pd-C to the saturated acid, γ-(6-methoxy-2-carboxy-1, 2, 3, 4-tetrahydro- 1-naphthyl)-butyric acid, by the method of Bachmann and co-workers. From this reaction only one of the two diastereoisomers was obtained as the principal product. This acid was resolved into its optical antipodes with brucine in anhydrous methanol. The 1-γ-(6-methoxy-2-carboxy-1, 2, 3, 4-tetrahydro-1-naphthyl)-butyric acid-brucine salt, being...

γ-(6-Methoxy-2-carboxy-3,4-dihydro-l-naphthyl)-butyric acid was reduced in the presence of 5% Pd-C to the saturated acid, γ-(6-methoxy-2-carboxy-1, 2, 3, 4-tetrahydro- 1-naphthyl)-butyric acid, by the method of Bachmann and co-workers. From this reaction only one of the two diastereoisomers was obtained as the principal product. This acid was resolved into its optical antipodes with brucine in anhydrous methanol. The 1-γ-(6-methoxy-2-carboxy-1, 2, 3, 4-tetrahydro-1-naphthyl)-butyric acid-brucine salt, being less soluble, was readily obtained pure in crystalline form. After a middle fraction was taken off, the filtrate was evaporated to dryness and the d-γ-(6-methoxy-2-carboxy- 1, 2, 3, 4-tetrahydro-1-naphthyl)-butyric acid-brucine salt was obtained as a gummy mass. No attempt was made to purify this fraction of the salt. By dissolving the crystalline portion of the brucine salt in an appropriate amount of chloroform and shaking the solution with 2N KOH for four times, followed by acidification of the alkaline solution, pure 1-acid was obtained as a colorless crystalline compound. After recrystallization from benzene-ethanol, the pure 1-acid melted at 171-172°and its [α]_D~(25) is -123°. The d-acid was liberated from the last gummy fraction of the brucine salt in the same fashion and after recrystallization from benzene-ethanol, it melted at 171-172°and its [α]_D~(25) is +121°. The 1-acid was esterified with diazomethane and its dimethyl ester was cyclized by the Dieckmann reaction. The sodium salt of the product from the Dieckmann reaction was methylated with CH_3I following the method used by Bachmann and co-workers in their synthesis of estrone A, and a mixture of the diastereoisomers of d-1-keto-2-methyl-2- carbomethoxy-7-methoxy-1, 2, 3, 4, 9, 10, 11, 12-octahydrophenanthrene was obtained as a yellow oil. By recrystallizing from acetone-petroleum ether only the least soluble isomer was obtained pure. It melted at 114-116°and its [α]_D~(25) is +89°in anhydrous ethyl alcohol. In the same fashion, d-γ-(6-methoxy-2-carboxy-1, 2, 3, 4-tetrahydro-1-naphthyl)-butyric acid was esterified and cyclized by the Dieckmann reaction followed by methylation and a mixture of the diastereoisomers of 1-1-keto-2-methyl-2-carbomethoxy-7-methoxy-1, 2, 3, 4, 9, 10, 11, 12-octahydrophenanthrene was obtained as a yellow oil. By recrystallizing from acetone-petroleum ether, only the least soluble isomer was obtained pure. It melted at 114-116° and its [α]_D~(25) is -90.4°. By means of the Reformatsky reaction between d-1-keto-2-methyl-2-carbomethoxy-7- methoxy-1, 2, 3, 4, 9, 10, 11, 12-octahydrophenanthrene and methyl bromoacetate, a methyl- d-1-hydroxy-2-methyl-2-carbomethoxy-7-methoxy-1, 2, 3, 4, 9, 10, 11, 12-octahydrophenan- threne-1-acetate was obtained. This dimethyl ester was recrystallized from methyl alcohol. It melted at 86-88° with slight previous softening and its [α]_D~(25) is +113.6° in anhydrous ethyl alcohol. In the same way, the methyl 1-1-hydroxy-2-methyl-2-carbomethoxy-7- methoxy-1, 2, 3, 4, 9, 10, 11, 12-octahydrophenanthrene-1-acetate was obtained from the 1-keto ester. The dimethyl ester was recrystallized from methyl alcohol; it melted at 86-88° with previous softening and its [α]_D~(25) is -113° in anhydrous ethyl alcohol.

1.用Cr_2O_3精製過的乙酸爲溶劑,5% Pd-C爲催化劑,γ-(6-甲氧基-2-羧基-3,4-二氫化萘-1-)丁酸很容易還原爲γ(6-甲氧基-2-羧基-1,2,3,4-四氫化萘-1-)丁酸。由此反應,祇得到一個非對映體爲主要產品。將此非對映體在純甲醇溶液內與馬錢子鹼化合,得到兩部分溶解度不同的鹽。溶解度較小的鹽結晶析出。此部分爲l-γ-(6-甲氧基-2-羧基-1,2,3,4-四氫化萘-1-)丁酸-馬錢子鹼鹽。由此鹽得到 l-γ(6-甲氧基-2-羧基-1,2,3,4-四氫化萘-1-)丁酸。將溶劑除去後得到的剩餘物爲d-γ-(6-甲氧基-2-羧基-1,2,3,4-四氫化萘-1-)丁酸馬錢子鹼鹽。由此部分得到d-γ-(6-甲氧基-2-羧基-1,2,3,4-四氫化萘-1-)丁酸。 2.由1-γ-(6-甲氧基-2-甲氧羰基-1,2,3,4-四氫化萘-1-)丁酸甲酯用Dieck-mann反應及甲基化後,得到d-1-酮-2-甲基-2-甲氧羰基-7-甲氧基-1,2,3,4,9,10,11,12-八氫化菲的非對映體混合物。由d-γ-(6-甲氧基-2-甲氧羰基-1,2,3,4-四氫化萘-1-)丁酸甲酯用Dieckmann反...

1.用Cr_2O_3精製過的乙酸爲溶劑,5% Pd-C爲催化劑,γ-(6-甲氧基-2-羧基-3,4-二氫化萘-1-)丁酸很容易還原爲γ(6-甲氧基-2-羧基-1,2,3,4-四氫化萘-1-)丁酸。由此反應,祇得到一個非對映體爲主要產品。將此非對映體在純甲醇溶液內與馬錢子鹼化合,得到兩部分溶解度不同的鹽。溶解度較小的鹽結晶析出。此部分爲l-γ-(6-甲氧基-2-羧基-1,2,3,4-四氫化萘-1-)丁酸-馬錢子鹼鹽。由此鹽得到 l-γ(6-甲氧基-2-羧基-1,2,3,4-四氫化萘-1-)丁酸。將溶劑除去後得到的剩餘物爲d-γ-(6-甲氧基-2-羧基-1,2,3,4-四氫化萘-1-)丁酸馬錢子鹼鹽。由此部分得到d-γ-(6-甲氧基-2-羧基-1,2,3,4-四氫化萘-1-)丁酸。 2.由1-γ-(6-甲氧基-2-甲氧羰基-1,2,3,4-四氫化萘-1-)丁酸甲酯用Dieck-mann反應及甲基化後,得到d-1-酮-2-甲基-2-甲氧羰基-7-甲氧基-1,2,3,4,9,10,11,12-八氫化菲的非對映體混合物。由d-γ-(6-甲氧基-2-甲氧羰基-1,2,3,4-四氫化萘-1-)丁酸甲酯用Dieckmann反應及甲基化後,得到1-1-酮-2-甲基-2-甲氧羰基-7-甲氧基-1,2,3,4,9,10,11,12-八氫化菲的非對映體混合物。由每一組非對映體混合物,我們現在祇分離了在丙酮-石油醚混合溶劑中溶解度最小的那部分結晶體。 3.由d-1-酮-2-甲基-2-甲氧羰基-7-甲氧基-1,2,3,4,9,10,11,12-八氫化菲及溴代乙酸甲酯,用Reformatsky反應,得到d-1-羥基-2-甲基-2-甲氧羰基-7-甲氧基-1,2,3,4,9,10,11,12-八氫化菲-1-乙酸甲酯。由l-1-酮-2-甲基-2-甲氧羰基-7-甲氧基-1,2,3,4,9,10,11,12-八氫化菲及溴代乙酸甲酯,用Reformatsky反應,得到l-1-羥基-2-甲基-2-甲氧羰基-7-甲氧基-1,2,3,4,9,10,11,12-八氫化菲-1-乙酸甲酯。

The crystal structure of P4S3 has a. unit cell with a= 3.64, b= 10.56 and c = 9.62A,which contains eight molecules. The space group isThe Patterson function P(o,o,w)and the intensities of reflections 00l hinted that the spacs group is D2h16 and P4S3 molecules of Hassel-Pettersen type sit on the mirror planes of the structure. An approximate structure was then dotennined on basis of steric considerations and the Patterson functions P (u, 1/2, Wp), P (u,1/2, w8), P(1/2, v, 1/2-wp), P (1/2, v,1/2-w8), P(u,1/2,O)...

The crystal structure of P4S3 has a. unit cell with a= 3.64, b= 10.56 and c = 9.62A,which contains eight molecules. The space group isThe Patterson function P(o,o,w)and the intensities of reflections 00l hinted that the spacs group is D2h16 and P4S3 molecules of Hassel-Pettersen type sit on the mirror planes of the structure. An approximate structure was then dotennined on basis of steric considerations and the Patterson functions P (u, 1/2, Wp), P (u,1/2, w8), P(1/2, v, 1/2-wp), P (1/2, v,1/2-w8), P(u,1/2,O) and P(1/2, v,1/2), where wp and w8 are the intramolecular distances respectively of the two P atoms and the two S atoms related by a mirror plane of the molecule. The structure was confirmed by the Fourier projection p (x, y) and by calculation of structure factors for reflections 00l and hk0.In crystal, the P4S3 molecules are of Hassel-Pettersen type. The present work confirms this conclusion in a convincing fashion. The approximate values of bond lengths and bond angle are P-P = 2.25A, P-S = 2.06A, P-S-P = 103?

P_4S_3晶体的空间群为D_(4h)~(16)-P2_1/b2_1/n2_1/m,每个晶胞中含有8个P_4S_3分子,正交晶胞3个晶轴的长度各为 a=13.64埃 b=10.56埃 c=9.62埃按照衍射谱中的系统消光,晶体的空间群亦可能为C_v~9-Pbn2_1。 从Patterson函数P(0,0,w)与衍射谱00l的强度数据中,可以得出晶体的空间群为D_(2h)~(16)与Hassel和Pettersen式的P_4S_3分子坐在结构中对称面上的工作假定以及原子的z坐标等,从而根据P(u,1/2,w_p),P(u,1/2,w_s),P(1/2,v,1/2-w_p),P(1/2,v,1/2-w_s),P(u,1/2,o)和P(1/2,v,1/2),其中w_p与W_s各为每一分子中由对称面联系着的一对P原子与S原子间的距离,以及P和S原子的共价半径、van der Waals半径等得出了各原子的x,y坐标。引得的试用结构最后又经Fourier投影ρ(x,y)与结构因子的计算得到肯定与修正。 在P_4S_3晶体中,分子系Hassel-Pettersen式的P_4S_3分子。本工作很可信服地肯定了这一点。键长与...

P_4S_3晶体的空间群为D_(4h)~(16)-P2_1/b2_1/n2_1/m,每个晶胞中含有8个P_4S_3分子,正交晶胞3个晶轴的长度各为 a=13.64埃 b=10.56埃 c=9.62埃按照衍射谱中的系统消光,晶体的空间群亦可能为C_v~9-Pbn2_1。 从Patterson函数P(0,0,w)与衍射谱00l的强度数据中,可以得出晶体的空间群为D_(2h)~(16)与Hassel和Pettersen式的P_4S_3分子坐在结构中对称面上的工作假定以及原子的z坐标等,从而根据P(u,1/2,w_p),P(u,1/2,w_s),P(1/2,v,1/2-w_p),P(1/2,v,1/2-w_s),P(u,1/2,o)和P(1/2,v,1/2),其中w_p与W_s各为每一分子中由对称面联系着的一对P原子与S原子间的距离,以及P和S原子的共价半径、van der Waals半径等得出了各原子的x,y坐标。引得的试用结构最后又经Fourier投影ρ(x,y)与结构因子的计算得到肯定与修正。 在P_4S_3晶体中,分子系Hassel-Pettersen式的P_4S_3分子。本工作很可信服地肯定了这一点。键长与键角的近似值为P-P=2.25 A,P—S=2.06 A,P—S—P—103°。 本工作是作者在氮族元素硫化物结构化学方面进行的研究工作的一部分。

Unlike amines and alcohols reacting with acylisothiocyanates to form acylthioureas andacylthiourethans respectively as the only products,phenols reacted,in general,with the samereagents in two different ways,namely:(Ⅰ)Acylation:(Ⅱ) Addition:where R=C_6H_5,p-BrC_6H_4,and R'=CH_3,H,Cl,COOH,NO_2,etc.In some cases,the former reaction occurred predominately.With phenols containinsproton-repelling groups,such as o-nitrophenol,p-nitrophenol,2,4-dinitrophenol,picric acid,etc.,which react with arylisocyanates with difficulty,however,addition...

Unlike amines and alcohols reacting with acylisothiocyanates to form acylthioureas andacylthiourethans respectively as the only products,phenols reacted,in general,with the samereagents in two different ways,namely:(Ⅰ)Acylation:(Ⅱ) Addition:where R=C_6H_5,p-BrC_6H_4,and R'=CH_3,H,Cl,COOH,NO_2,etc.In some cases,the former reaction occurred predominately.With phenols containinsproton-repelling groups,such as o-nitrophenol,p-nitrophenol,2,4-dinitrophenol,picric acid,etc.,which react with arylisocyanates with difficulty,however,addition reaction took place readilyand gave acylthiourethans in high yields.o-Aminophenol reacted with aroylisothiocyanates forming corresponding aroylthiourea insteadof urethan.In basic medium acetoacetic ester reacted with p-bromobenzoylisothiocyanate yielding anaddition compound,which showed no unsaturation.It was,therefore,suggested that theaddition took place between isothiocyanate residue and the active hydrogen of the keto formrather than the enol form of the ester.Malonic ester reacted with the reagent in the same fashion.

1. 芳酰异硫氰与酚类作用时,反应一般以两种类型进行,即酰化与加成。某些情况下酰化反应占优势。但是硝基酚能够顺利地与芳酰异硫氰起加成反应。所得到的酰氨基硫代甲酸酚酯均为有一定熔点的良好晶体。2. 鄰氨基酚与芳酰异硫氰作用时,由氨基起加成反应得到对应的芳酰基硫脲。3. 含活泼亚甲基的化合物,如乙酰乙酸乙酯及丙二酸二乙酯,与对溴苯甲酰异硫氰作用时,可以得到亚甲基上活泼氢原子与试剂起加成反应的产物。

 
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