Trifluoromethanesulfonyl azide: an efficient reagent for the preparation of α-cyano-α-diazo carbonyls and an α-sulfonyl-α-diazo carbonyl

The reaction scope of trifluoromethanesulfonyl azide in diazo transfer reactions was extended to include the preparation of α-cyano-α-diazo-carbonyls, phenyl sulfonyl diazoacetophenone and diethyl diazomalonate in high yields. The effect of the bases used in the diazo transfer reactions were found to have a dramatic influence on the success of the reaction with pyridine being the base of choice.     

高效液相色谱和热重分析在树形聚酰胺胺合成中的应用

优化了聚酰胺胺树形分子合成工艺条件，采用HPLC和热重分析（TG）相结合的方法对所合成的树形聚酰胺胺进行分析与表征；HPLC的分析表明，在各不同代的目标化合物中，均有反应物单体存在，在高代产物中除了含有少量反应物外，还有少量的低代数分子；TG分析表明，产物中小分子反应物占的比例很少，一般为2％－3％左右，如果将减压蒸馏后的产物重新进行真空干燥，对半代树形大分子，能进一步有效除去小分子反应物，而对于整数代树形大分子，则效果并不理想。     

Mesoporous silica anchored Ru catalysts for highly enantioselective hydrogenation of beta-ketoesters

Recyclable and reusable mesoporous silica anchored Ru catalysts based on 4,4'-substituted BINAPs were synthesized and used for the hydrogenation of beta-alkyl beta-ketoesters with up to 98.6% e.e. and beta-aryl beta-ketoesters with up to 95.2% e.e.     

N,N’-双(2-羟基-4-甲氧基二苯酮)乙二亚胺合铜(Ⅱ)、镍(Ⅱ)、钴(Ⅱ)配合物的合成

水杨醛 Schiff碱类配合物的研究已有很多报道[1,2 ] ,而二苯酮 Schiff碱类配合物报道则很少 .另外 ,利用固液相反应合成配合物的报道也不多见 .本工作是将 2 -羟基 - 4-甲氧基二苯酮与乙二胺缩合 ,合成 Schiff碱 ,进而与过渡金属盐通过固液相反应合成配合物 ,以便探讨新化合物的护肤防晒性能 .我们发现 ,配合物对紫外光吸收强度可增加 3～ 4倍 ,具有较好的防晒效果 .EA- 1 0 6型元素分析仪 ;理学 D/ max- YB X射线衍射仪 ,Cu Kα射线 (λ=0 .1 5 4 nm) ,Ni单色器 ,电压 40 k V,电流 40 m A,扫描速度 2°/ min,室温收集 3～ 80°( 2θ)…     

EIGHT-POINT STRAIGHT-LINE-NET-DIAGRAMS OF BINARY SIX-PHASE (n+4) MULTISYSTEMS (Ⅱ)——DERIVATION FROM THEORY OF PHYSICALLY REAL NETS

Based on the theory of physically real nets, the 8- point straight-line nets of bi-nary 6- phase (n + 4) multisystems (31 in toto) have been derived directly from the l-point straight-line nets. This result is in complete agreement with that derived fromthe theory of closed nets, indicating the incorrectness of the previous conclusion thatthere is only one 8-point straight-line net which corresponds to only one 8- pointstraight-line-net-diagram for binary 6- phase multisystems.     

月光花素甲(Ⅰ)、(Ⅱ)整体分子结构的测定

本文对月光花素甲(Calonyctin A)的整体分子结构分析加以完善并进行总结。前文报道月光花素甲是两个分子量相差28a.m.u的糖甙类同系物分子的混合物。这两个分子(简称M_1和M_2)分别称为月光花素甲(Ⅰ)与月光花素甲(Ⅱ)(Calonyctm A_1,CalonyctinA_2),分子量分别为938与910。它们分别含     

Photocrosslinking of copolymers of vinyloxyethyl methacrylate–styrene initiated by sulfonium salts. I. Transient species formed on photolysis of sulfonium salt

Benzyl cation was detected by transient absorption spectroscopy with a spectroscopic multichannel analyzer on pulse excitation (fourth harmonic of Nd:YAG laser, 266 nm; 10 ns fwhm) of benzyl(4-hydroxyphenyl) methylsulfonium hexafluoroantimonate(BSS) in 1,2-dichloroethane (EDC). The benzyl cation was long-lived (lifetime, 59 ms) at room temperature and quenched by a vinyl ether compound. The formation of the benzyl cation as active species on photolysis of BSS is in contrast to the formation of Brønsted acids in other sulfonium salts so far reported. © 1992 John Wiley & Sons, Inc.     

镧对Rhizoctonia solani的毒力及其致病酶活性的影响

采用琼脂平板生长速率法及液体培养基培养测定了La对立枯丝核病菌(Rhizoctoniasolani)的抑制作用和毒力,并测定了其对病菌胞外的果胶酶、蛋白酶和纤维素酶等几种致病酶的活性的影响。结果表明,随着La浓度升高,对病菌菌丝生长的抑制作用增强,固体培养上所测定的对病菌的EC50和EC95分别为171.9和667.7mg·L-1;在液体培养基中所测定的EC50和EC95分别为111 4和500 7mg·L-1。在一定浓度范围内,La提高了单位量菌丝所产生3种致病酶的活性,但由于对菌丝生长量的强烈抑制,使病菌胞外3种致病酶的总量或总活性受到抑制,减低了病菌的致病力。     

Synthesis of a novel spiro bisphosphinamidite ligand for highly enantioselective hydrogenation

A novel chiral bisphosphinamidite ligand SpiroNP has been synthesized. The rhodium complex of this ligand has been found to be highly active and enantioselective in the asymmetric hydrogenation of (Z)-2-acetamidoacrylic acid derivatives and α,β-unsaturated carboxylic acid derivatives.     

醇对非离子型表面活性剂浊点的影响

研究了醇对非离子型表面活性剂浊点的影响，发现直链醇的碳原子数小于４时随着其在表面活性剂中含量的增加浊点上升；当碳原子数大于４时，则随着醇含量的增加浊点下降。醇的构型对浊点起着重要作用。