- Homo and heterodinuclear complexes derived from unsymmetrical macrocyclic ligands with two coordination sites: Removal of a pendant arm and migration of copper ion upon cyclization
-
The dinucleating macrocyclic ligands (L2a)2- and (L2b)2- were prepared by [1:1] cyclic condensation of N,N′-dipropionitrile-N,N′-ethylene-di(5-methyl-3-formyl-2- hydroxybenzylamine or N,N′-dipropionitrile-N,N′-ethylene-di(5-bromo- 3-formyl-2-hydroxybenzylamine with 1,3-diaminopropane. The ligands include dissimilar N(amine)2O2 and N(imine)2O 2 coordination sites sharing two phenolic oxygen atoms and containing two propionitrile pendant arms on the amine nitrogen atoms. A series of mono- and dinuclear complexes were synthesized and characterized on the basis of elemental analysis, molar conductance measurement, X-ray crystallography, IR, NMR, and UV-Vis spectroscopies as well as cyclic voltammetric measurements. During the cyclization copper(II) migrates from the N(amine)2O 2 to the N(imine)2O2 coordination site and one of the propionitrile pendant arms is removed. The heterodinuclear complexes [ZnL2Cu(OAc)]+ were prepared by a transmetallation reaction. The characterization results showed that the two metal ions are bridged by two phenolic oxygen atoms and an acetate group, providing distorted five-coordinate geometries for both metals.
- Golchoubian, Hamid,Fateh, Davood Sadeghi,Bruno, Giuseppe,Rudbari, Hadi Amiri
-
-
Read Online
- Propanil emulsifiable concentrate herbicide and preparation method thereof
-
The invention discloses a propanil emulsifiable concentrate herbicide, belongs to the technical field of herbicides, and comprises the following raw materials in percentage by weight: 1 - 35% parts of propanil. Ether 1 - 20%, isophorone 1 - 20%, crowndaisy chrysanthemum extract 4 - 15%, potassium nitrate 2 - 10%, emulsifier 3 - 5%, dispersant 1 - 3%, defoaming agent 1 - 3%, ultraviolet absorber 3 - 6%, vegetable oil 10 - 20% and the balance are carrier. The invention further discloses a preparation method of the herbicide. In the herbicide formula, the ultraviolet absorbent is added in the herbicide formula, so that the compound herbicide has the effects of oxidation resistance, aging resistance, ultraviolet aging resistance, effective component visible light decomposition, and persistent drug effect.
- -
-
Paragraph 0037; 0068; 0075; 0078; 0085; 0088; 0095
(2021/10/27)
-
- BENZYLATED MANNICH BASE CURING AGENTS, COMPOSITIONS, AND METHODS
-
Compositions and curing agents comprising a benzylated Mannich base composition. The benzylated Mannich base composition includes a reaction product of (a) a substituted phenolic compound having at least one substituent of formula (I): wherein R1 is each independently a linear or branched alkyl group having 1 to 4 carbon atoms, and R2 is hydrogen, methyl, ethyl or phenyl, with (b) a benzylated polyalkylene polyamine (II): wherein RA is substituted or unsubstituted benzyl; RB is each independently RA, or a hydrogen atom, or a group selected from C1-C16 linear, cyclic, and branched alkyl, alkenyl, and alkaryl groups; X, Y, and Z are independently selected from C2-C10 alkylene, and cycloalkylene groups; y is an integer from 0 to 7, and z is an integer from 0 to 4; and, optionally, (c) a multifunctional amine. Amine-epoxy compositions and articles produced from these compositions are also disclosed.
- -
-
Paragraph 0139
(2017/09/08)
-
- METHOD FOR PREPARING N,N'-BIS(2-CYANOETHYL)-1,2-ETHYLENEDIAMINE
-
A method for preparing N,N′-bis(2-cyanoethyl-1,2-ethylenediamine involves using glycol ether as a catalyst for synthesis reaction in which ethylenediamine and acrylonitrile at a molar ratio of 1:1.9-2.1 are reactant that react at 20-70°C to prepare N,N′-bis(2-cyanoethyl)-1,2-ethylenediamine; the method improves the yield to 98.15-98.98%; and the used glycol ether may be filtered and recycled, thereby saving costs and reducing environmental pollution.
- -
-
Paragraph 0027-0030; 0056
(2017/06/21)
-
- METHOD FOR PREPARING N,N'-BIS(2-CYANOETHYL)-1,2-ETHYLENEDIAMINE BY USING CATION EXCHANGE RESIN AS CATALYST
-
A method for preparing N,N′-bis(2-cyanoethyl)-1,2-ethylenediamine involves using strongly acidic cation exchange resin as a catalyst for synthesis, and is advantageous for not only eliminating the need of distillation for purification and thereby reducing reaction time, but also improving the yield of N,N′-bis(2-cyanoethyl)-1,2-ethylenediamine to 97.70-98.08%; and the method benefits simplified process and reduced costs and helps to save water significantly, thereby minimizing environmental pollution.
- -
-
Paragraph 0032; 0033; 0035; 0036
(2017/06/23)
-
- PREPARATION METHOD OF HIGH SELECTIVITY N, N'-BIS(2-CYANOETHYL)-1,2-ETHYLENEDIAMINE
-
A method for preparing N,N'-bis(2-cyanoethyl)-1,2-ethylenediamine involves using strongly acidic cation exchange resin as a catalyst for synthesis, and is advantageous for not only eliminating the need of distillation for purification and thereby reducing reaction time, but also improving the yield of N,N'-bis(2-cyanoethyl)-1,2-ethylenediamine to 97.70-98.08%; and the method benefits simplified process and reduced costs and helps to save water significantly, thereby minimizing environmental pollution.
- -
-
Paragraph 0023; 0025; 0027; 0028; 0029; 0031; 0033; 0038
(2017/09/12)
-
- Probing Carbocatalytic Activity of Carbon Nanodots for the Synthesis of Biologically Active Dihydro/Spiro/Glyco Quinazolinones and Aza-Michael Adducts
-
Herein, we report the fluorescent carbon dots as an effective and recyclable carbocatalyst for the generation of carbon-heteroatom bond leading to quinazolinone derivatives and aza-Michael adducts under mild reaction conditions. The results establish this nanoscale form of carbon as an alternative carbocatalyst for important acid catalyzed organic transformations. The mild surface acidity of carbon dots imparted by -COOH functionality could effectively catalyze the formation of synthetically challenging spiro/glycoquinazolinones under the present reaction conditions.
- Majumdar, Biju,Mandani, Sonam,Bhattacharya, Tamalika,Sarma, Daisy,Sarma, Tridib K.
-
p. 2097 - 2106
(2017/02/26)
-
- Experimental and theoretical study for corrosion inhibition of mild steel 1 M HCl solution by some new diaminopropanenitrile compounds
-
The inhibition of the corrosion of mild steel 1 M HCl solution by some diamine compounds has been investigated in relation to the concentration of the inhibitor as well as the temperature using weight loss and electrochemical measurements. The effect of the temperature on the corrosion behavior with the addition of different concentrations of new diamine compounds (3-[2-(2-cyano-ethylamino)- methylamino]-propionitrile (P1); 3-[2-(2-cyano-ethylamino)-ethylamino]-propionitrile (P2), and 3-[6-(2-cyano-ethylamino)-hexylamino]-propionitrile (P3), respectively, was studied in the temperature range 40-80 °C. Polarization curves reveal that (P1, P2, and P3) are mixed type inhibitors. The inhibition efficiency of organic compounds is temperature independent, but increases with the inhibitor concentration. Adsorption of inhibitor on the carbon steel surface is found to obey the Langmuir adsorption isotherm. Some thermodynamic functions of dissolution and adsorption processes were also determined. On the other hand, and in order to determine the relationship between the molecular structure of these compounds and inhibition efficiency, quantum chemical parameters were calculated. The theoretically obtained results were found to be consistent with the experimental data. Springer Science+Business Media B.V. 2012.
- Herrag,Bouklah,Patel,Mistry,Hammouti,Elkadiri,Bouachrine
-
p. 1669 - 1690
(2012/11/13)
-
- Selective Manufacture of N,N'-BIS(Cyanoethyl)-1,2-Ethylenediamine and N, N'-BIS(3-aminopropyl)-1,2-Ethylenediamine
-
A method for making N,N′-bis(3-aminopropyl)-1,2-ethylenediamine which comprises reacting acrylonitrile and ethylenediamine in about a 2:1 molar ratio to make a N,N′-bis(cyanoethyl)-1,2-ethylenediamine reaction product and hydrogenating the reaction product, the improvement for improving the selectivity of the reactions to N,N′-bis(2-cyanoethyl)-ethylenediamine and to N,N′-bis(3-aminopropyl)-1,2-ethylenediamine which comprises reacting acrylonitrile and ethylenediamine in the presence of 2-30 wt % water, based on total reactants.
- -
-
Page/Page column 2
(2008/12/07)
-
- Tandem bis-aza-Michael addition reaction of amines in aqueous medium promoted by polystyrenesulfonic acid
-
An efficient and environmentally benign tandem bis-aza-Michael addition of amines catalyzed by polystyrenesulfonic acid (PSSA) is described. This operationally simple high yielding microwave assisted synthetic protocol proceeded in water in the absence of any organic solvent.
- Polshettiwar, Vivek,Varma, Rajender S.
-
p. 8735 - 8738
(2008/03/18)
-