1) Double Dissymmetry
双不对称
2) bipolar and unsymmetric
双极不对称
1.
Experimental results indicate that dust precharge ,specially bipolar and unsymmetric precharge,improves the performance of fibre-pad filters.
实验表明 ,粉尘预荷电技术能有效提高纤维过滤器性能 ,尤以双极不对称荷电方式为最佳。
3) asymmetric dihydroxylation
不对称双羟化
1.
The use of(QD)_2 PYDZ in asymmetric dihydroxylation(AD)of olelfins provided the corresponding chiral vicinal diols with 88～95%chemical yield and the values of enantiomeric excess(ess)are between 75% and 99%.
烯烃不对称双羟化反应(Asymmetric D ihydroxylation,简称AD反应)和不对称氨羟化反应(Asymmet-ric Am inohydroxylation,简称AA反应)是获得手性连二醇和手性β-氨基醇的最简便的方法[1]。
2.
A series of enantiopure β-amino alcohols were synthesized from the corresponding diols pro- duced by Sharpless asymmetric dihydroxylation, cyclization of diols, azide opening of epoxides, and cata- lytic hydrogenation of the resulting azido alcohols.
在手性配体1,4-双(9-O-奎宁)-2,3-二氮杂萘[(QN)2PHAL]存在下,通过烯烃的Sharpless不对称双羟化、环化、亲核开环和催化氢化等步骤方便地合成了手性β-氨基醇。
3.
Moreover, the resin-bound OsO 4 exhibited excellent catalytic activity in the asymmetric dihydroxylation of olefins and was easily recovered and reused in five consecutive reactions, without significant decrease in activity.
合成了在烯烃不对称双羟化反应中可回收和重复使用的TentaGel支载的OsO4催化剂 。
4) dissymmetrical double Schiff base
不对称双Schiff碱
1.
A new dissymmetrical double Schiff base Cu(II) mononuclear complex: Cu(HLt) (1), where H3Lt is N-3-carboxylsalicylidene-N'-salicylidene-1,3-propylenediamine) and its two heterotrinuclear com- plexes: [(CuLt)2Ni]·2.
合成了一种新的不对称双Schiff碱Cu(II)单核配合物Cu(HLt)(1)(H3Lt为N-3-羧基水杨醛-N'-水杨醛-缩1,3-丙二胺)及其两个异三核配合物[(CuLt)2Ni]·2。
2.
A dissymmetrical double Schiff base Cu(Ⅱ) mononuclear complex HCuLt (Where H3Lt is N-3-carboxylsalicylidene-N′-salicylaldehyde-1,3-diaminopropyl) and its Cu(Ⅱ)Co(Ⅱ)Cu(Ⅱ) trinuclear complex (CuLt)2Co·4H2O have been synthesized and characterized by elemental analysis, IR and electron spectraometry.
合成了不对称双Schiff碱Cu(Ⅱ)单核配合物HCuLt(H3Lt为N-3-羧基水杨醛-N′-水杨醛-缩1,3丙二胺)及其Cu(Ⅱ)Co(Ⅱ)Cu(Ⅱ)异三核配合物,用元素分析、红外光谱、电子光谱的方法对它们进行了结构表征。
3.
A new selective salicylate PVC membrane electrode based on dissymmetrical double Schiff base het- erotrinuclear complex as the neutral carrier is made.
研制了以不对称双Schiff碱异三核配合物为中性载体的PVC膜电极,对Sal-具有近Nernst电位响应,并呈现出反Hofmeister选择性行为。
5) asymmetric bis-Schiff base
不对称双席夫碱
1.
Three new asymmetric bis-Schiff bases containing thiocarbohydrazide were synthesized by the reaction of thiocarbohydrazide with ketone and different aldehydes step by step.
通过二氨基硫脲与酮或不同的醛进行分步反应,合成了3种未见报道的不对称双席夫碱。
6) asymmetrical double Schiff base
不对称双Schiff碱
1.
An asymmetrical double Schiff base Cu(Ⅱ) mononuclear complex HCuLe(Where H_(3)Le is N-3-carboxylsalicylidene-N′-(5-chlorosalicylaldehyde-1,2-diaminoethane)) and its trinuclear complexes Cu(Ⅱ)M(Ⅱ)Cu(Ⅱ)(M=Co,Cu) were synthesized and characterized by means of elemental analysis,IR and(electron) spectrometries.
合成了不对称双Schiff碱Cu(Ⅱ)单核配合物HCuLe(H3Le为N-3-羧基水杨醛-N-(′5-氯水杨醛)缩乙二胺)及三核配合物Cu(Ⅱ)Co(Ⅱ)Cu(Ⅱ)和Cu(Ⅱ)Cu(Ⅱ)Cu(Ⅱ),用元素分析、红外光谱、电子光谱测试技术对它们进行了表征。
2.
A Cu(Ⅱ) mononuclear complex CuHL of asymmetrical double Schiff base(Where H 3 L is N 3 carboxylsalicylidene N ′ salicylaldehyde diaminoethane) and a Cu(Ⅱ) Zn(Ⅱ) Cu(Ⅱ) trinuclear complex have been synthesized and characterized by elemental analysis, IR and UV vis.
合成了不对称双Schiff碱Cu(Ⅱ)单核配合物CuHL(H3L为N3羧基水杨醛N′水杨醛缩乙二胺)及其Cu(Ⅱ)Zn(Ⅱ)Cu(Ⅱ)异三核配合物。
补充资料：双不对称合成
分子式：
CAS号：
性质：由手性试剂和手性底物产生的双重不对称诱导作用而进行的不对称合成。当R=R*=(-)-孟基时，产物R-(-)-型41％对映体过量(e.e.)在双不对称合成中，两个控制因素有可能相互加强，因而较大程度地提高反应的立体选择性，以使预期的对映体有较高的收率。
CAS号：
性质：由手性试剂和手性底物产生的双重不对称诱导作用而进行的不对称合成。当R=R*=(-)-孟基时，产物R-(-)-型41％对映体过量(e.e.)在双不对称合成中，两个控制因素有可能相互加强，因而较大程度地提高反应的立体选择性，以使预期的对映体有较高的收率。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条