The preparation and some reactions of 2,5-dichloro-1,1,1,6,6,6-hexafluoro-3,4-diazahexa-2,4-diene
作者:Michael G. Barlow、David Bell、Neil J. O'Reilly、Anthony E. Tipping
DOI:10.1016/s0022-1139(00)85134-9
日期:1983.6
The title azine(I) can be conveniently prepared by treatment of 1,2-bistrifluoroacetylhydrazine with - dimethylaniline hydrochloride in phosphoryl chloride at . 100 °C. It undergoes facile displacement of one or both chlorine atoms on treatment with a variety of nitrogen-, oxygen- and sulphur-centred nucleophiles as well as with iodide and fluoride ions. The bisanilino-substituted azine (Vd) is thermally
An adaptive social network for information access: Theoretical and experimental results
作者:Bin Yu、Mahadevan Venkatraman、Munindar P. Singh
DOI:10.1080/713827056
日期:2003.1
approaches, our architecture is fully distributed and includes agents who preserve the privacy and autonomy of their users. These agents learn models of each other in terms of expertise (ability to produce correct domain answers) and sociability (ability to produce accurate referrals). We study our framework experimentally to study how the social network evolves. Specifically, we find that under our multi-agent
Anion variation on a cobalt(iii) complex of salen-type ligand tethered by four quaternary ammonium salts for CO2/epoxide copolymerization
作者:Jina Yoo、Sung Jae Na、Hyeong Cheol Park、Anish Cyriac、Bun Yeoul Lee
DOI:10.1039/b920992a
日期:——
scrambling two X's in 6, 10, or 12 are replaced with the corresponding [X⋯H⋯X]− homoconjugate. These complexes, which adopt an unusual imine uncoordinated structure, are excellent catalysts for CO2/propylene oxide copolymerization (turnover frequency (TOF), 8300–16 000 h−1). In all cases, the complex containing the homoconjugate [X⋯H⋯X]− shows higher activity than the corresponding phenol-free complex.
BF的阴离子交换4 -发生通过搅拌钴(III) 的复合体 Salen四元系链的三型配体 铵盐BF 4 -过的淤浆的盐钠CH 2 Cl 2中的化合物,得到一个含四个X的络合物钴 (X = 2,4,5-三氯酚盐,6 ; X =4-硝基酚盐,10 ; X =2,4-二氯苯酚盐,12)。的1 H和13 C NMR光谱与一个不寻常的亚胺不协调结构一致。他们俩Salen-苯氧基和两个X持续与 钴(III) 形成方形平面 钴酸盐复杂,而另外两个X通过协调和解配向方形平面的轴向位置争夺。复数的另一种形式(X =2,4,5-三氯酚盐,14 ; X =4-硝基酚盐,15 ; X =2,4-二氯苯酚盐,16)也被制备,其中,所述加扰两个X在6,10,或12与相应的[X取代⋯H[X] -同缀物。这些络合物采用不常见的亚胺不协调结构,是CO 2 /的极佳催化剂。环氧丙烷共聚(周转频率(TOF),8300-16 000
PHENOXYMETHYL 2-CHLOROETHYL ETHERS
作者:Marshall Kulka
DOI:10.1139/v55-001
日期:1955.1.1
A series of phenoxymethyl 2-chloroethyl ethers has been prepared for testing as possible insecticides.