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11.
Synthesis,Spectra Characterization,Electrochemical Behavior of Silyl Derivatives of Ferrocene
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Ferrocenyl‐substituted silanes via the reaction between mono and dilithio‐ferrocene with trimethyl, trietheyl, vinyldimethyl or t‐butyldimethyl chlorosilanes is prepared. The electrochemical behaviors of these compounds were investigated by cyclic voltammetry. This work describes the electrochemical and electrocatalytic properties of carbon ceramic electrode (CCE) modified with ferrocene composites as a new electrocatalyst material. 相似文献
12.
G.R. Jahanshahloo F. Hosseinzadeh Lotfi N. Shoja A. Gholam Abri M. Fallah Jelodar Kamran Jamali Firouzabadi 《Mathematical and Computer Modelling》2011,53(5-6):587-596
One important issue in DEA which has been studied by many DEA researchers is the sensitivity of the results of an analysis to perturbations in the data.This paper develops a procedure for performing a sensitivity analysis of the inefficient decision making units (DMUs). The procedure yields an exact “Necessary Change Region” in which the efficiency score of a specific inefficient DMU changes to a defined efficiency score.In what follows, we identify a new frontier, and prove the efficiency score of each arbitrary unit on it which is defined as the efficiency score. 相似文献
13.
Fe(NO3)3·9H3O/Fe(HSO4)3 was used as an efficient reagent system for the oxidation of alcohols to their corresponding carbonylcompounds. All reactions were performed in the absence of solvent in good to high yields. Under the same reaction conditions,thiols and sulfides were also converted to their corresponding disulfides and sulfoxides, respectively. 相似文献
14.
A. Gholam Abri G. R. Jahanshahloo F. Hosseinzadeh Lotfi N. Shoja M. Fallah Jelodar 《Optimization Letters》2013,7(2):309-324
Data envelopment analysis (DEA) evaluates the performance of decision making units (DMUs). When DEA models are used to calculate efficiency of DMUs, a number of them may have the equal efficiency 1. In order to choose a winner among DEA efficient candidates, some methods have been proposed. But most of these methods are not able to rank non-extreme efficient DMUs. Since, the researches performed about ranking of non-extreme efficient units are very limited, incomplete and with some difficulties, we are going to develop a new method to rank these DMUs in this paper. Therefore, we suppose that DMU o is a non-extreme efficient under evaluating DMU. In continue, by using “Representation Theorem”, DMU o can be represented as a convex combination of extreme efficient DMUs. So, we expect the performance of DMU o be similar to the performance of convex combination of these extreme efficient DMUs. Consequently, the ranking score of DMU o is calculated as a convex combination of ranking scores of these extreme efficient DMUs. So, the rank of this unit will be determined. 相似文献
15.
A one-pot three-component condensation of aromatic aldehydes, β-ketoesters and urea or thiourea, efficiently promoted in the presence of Fe(HSO4)3 in solution and under solvent-free conditions, produced 3,4-dihydropyrimidin-2(1H)-ones. The method offers several advantages including simple, easy and clean work-up procedure, relatively short reaction times and good to high yields of the products 相似文献
16.
Farhad Shirini Mohammad Ali Zolfigol Abdol-Reza Abri 《中国化学快报》2007,18(7):803-806
Alcohols are selectively and efficiently protected as their tetrahydropranyl ethers in the presence of a catalytic amount of Fe(HSO4)3 in good to high yields. All reactions are performed under mild and completely heterogeneous reaction conditions. 相似文献
17.
Shadpour E. Mallakpour Abdol-Reza HajipourMohammad Reza Zamanlou 《European Polymer Journal》2002,38(3):475-485
3,3′,4,4′-benzophenonetetracarboxylic dianhydride (4,4′-carbonyldiphthalic anhydride) (1) was reacted with l-phenylalanine (2) in a mixture of acetic acid and pyridine (3:2) and the resulting imide-acid [N,N′-(4,4′-carbonyldiphthaloyl)-bis-l-phenylalanine diacid] (4) was obtained in high yield. The compound (4) was converted to the N,N′-(4,4′-carbonyldiphthaloyl)-bis-l-phenylalanine diacid chloride (5) by reaction with thionyl chloride. A new facile and rapid polycondensation reaction of this diacid chloride (5) with several aromatic diamines such as 4,4′-diaminodiphenyl methane (6a), 2,4-diaminotoluene (6b), 4,4′-sulfonyldianiline (6c), p-phenylenediamine (6d), 4,4′-diaminodiphenylether (6e), m-phenylenediamine (6f), benzidine (6g) and 2,6-diaminopyridine (6h) was developed by using a domestic microwave oven in the presence of a small amount of a polar organic medium such as o-cresol. The polymerization reactions proceeded rapidly, compared with the conventional solution polycondensation, and was completed within 7 min, producing a series of optically active poly(amide-imide)s with high yield and inherent viscosity of 0.22-0.52 dl/g. All of the above polymers were fully characterized by IR, elemental analyses and specific rotation. Some structural characterization and physical properties of this optically active poly(amide-imide)s are reported. 相似文献