- Facile synthesis of aliphatic hyperbranched polyesters based on diethyl malonate and their irreversible molecular encapsulation
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Synthesis of diethyl malonate based wholly aliphatic hyperbranched polyesters having suitable polar matrix for irreversible molecular encapsulation is carried out for the first time.
- Santra, Santimukul,Kumar, Anil
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- Ultralow molecular weight dendritic alkyl hexamine shale inhibitor and synthetic method thereof
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The invention relates to an ultralow molecular weight dendritic alkyl hexamine shale inhibitor and a synthetic method thereof. The synthetic method comprises the following steps: 1, synthesizing triethyl methanetricarboxylate; 2, synthesizing hexaester; 3, synthesizing hexaamide; and 4, synthesizing hexamine. The alkyl hexamine product prepared through the method has a molecular structure formula shown in the description, and 1-3% of the alkyl hexamine product is mixed with clear water to prepare a shale inhibitor. The synthetic method has the advantages of good reliability, high synthesis yield, low prices of raw materials, low production cost, safe and environmentally-friendly product, and suitableness for large-scale industrial production; and the alkyl hexamine product is nontoxic and harmless, has good water solubility, and has an obviously better inhibition performance than the same variety of products, and the addition amount of the alkyl hexamine has small influences on the rheological property of a drilling fluid, so the contradiction of the inhibition and the rheological property of the drilling fluid is effectively balanced, and the drilling fluid has high temperature resistance and is especially suitable for drilling ultrahigh temperature deep wells.
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Paragraph 0046-0050; 0064-0068; 0086; 0087
(2017/07/01)
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- Iron-catalyzed, hydrogen-mediated reductive cyclization of 1,6-enynes and diynes: Evidence for bis(imino)pyridine ligand participation
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(Chemical Equation Presented) The bis(imino)pyridine iron dinitrogen complex (iPrPDI)Fe(N2)2 catalyzes the hydrogen-mediated reductive cyclization of enynes and diynes with turnover frequencies comparable to those of established precious metal catalysts. Amino, oxygenated, and carbon-based substrates are readily cyclized to the corresponding hetero- and carbocycles with 5 mol % iron and 4 atm H2 at 23°C. Stoichiometric reactions between selected substrates and the iron compound under a N2 atmosphere established transfer dehydrogenation from an isopropyl aryl substituent to either the enyne or diyne substrate. In situ monitoring of the catalytic reaction by 1H NMR spectroscopy coupled with deuterium labeling experiments established rapid cyclization followed by turnoverlimiting hydrogenation. Copyright
- Sylvester, Kevin T.,Chirik, Paul J.
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supporting information; experimental part
p. 8772 - 8774
(2009/12/04)
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- NOVEL 3, 4-PROPYLENEDIOXYTHIOPHENE DERIVATIVES WITH PENDANT FUNCTIONAL GROUPS
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The present invention relates to the syntheses of 3,4-propylenedioxythiophenes of the formula (I) wherein R represents a n-valent linear or branched, optionally substituted, aliphatic C1-Cn radical and Y represents a pendant functional group. Further, methods for the preparation of the said compounds are disclosed.
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Page/Page column 5-6
(2010/11/24)
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- 4-Hydroxy-2-quinolones. 107. Reaction of triethyl methanetricarboxylate with indoline
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The first stage of the reaction of triethyl methanetricarboxylate with indoline is the formation of the diethyl ester of 2-(indoline-1-carbonyl)malonic acid, which then, depending on the conditions selected, may be converted into the ethyl ester of 2-(indoline-1-carbonyl)-3-(indolin-1-yl)-3-oxopropionic acid, methanetri-N-(indolin-1-yl)carboxamide, or the ethyl ester or (indolin-1-yl)amide of 1-hydroxy-3-oxo-5,6-dihydro-3H-pyrrolo[3,2,1-ij] quinoline-2-carboxylic acid.
- Ukrainets,Gorokhova,Sidorenko,Bereznyakova
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p. 1032 - 1037
(2008/09/16)
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- Synthesis and properties of cobalt(III) complexes of tripodal ligands containing amide functional groups
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Two new, trigonally symmetrical, triamide tripodal ligands and their complexes with the cobalt(III) ion, [1,1,1-tris-(4-amino-1-oxo-2-azabutyl)ethanato]cobalt(III)trihydrate 1 and [1,1,1-tris(4-amino-4-methyl-3-oxo-2-azapentyl)-ethanato]cobalt(III)-water- ethanol (1/8/0.5) 2 have been prepared. The hexadentate structures of the neutral, trigonal, triamido complexes have been established by an X-ray study of 1 and 13C NMR spectrometry of both molecules. The chemical, spectroscopic and electrochemical properties of the complexes have been investigated as well as those of the monoamido tripodal complex [1,9-diamino-5-(4-amino-2-azabutyl)-5-ethoxycarbonyl-4-oxo-3,7-diazanonanato] cobalt(III) chloride.
- Angus, Patricia M.,Elliott, Anthony J.,Sargeson, Alan M.,Willis, Anthony C.
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p. 1131 - 1136
(2007/10/03)
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- Novel [1,N]-Carbon to Carbon Rearrangement of an Ester Group via Organotitanium Intermediates Wherein the N Varies from 2 to 5. Full Scope and Limitation Leading Predominantly to the Rearrangement
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Malonates and methanetricarboxylates having an unsaturated side chain such as 2, 12, 20, 22, 24, 31, or 37 underwent a new ester rearrangement reaction promoted by (η2-propene)Ti(O-i-Pr)2 to afford the succinate derivative 4 or α,β-unsaturated ester 17, 21, 23, 25, 34, or 38 via the migration of the ester group from its original bis- or tris-ester position to the acetylene- or olefin-litanium complex. It has been found that the side reactions competing with the desired migration are dealkylation of the side chain of the ester and a simple cyclization. The substrates and conditions which allow the ester migration a preferential path were determined as well as the scope and limitation of this reaction.
- Yamazaki, Takanori,Urabe, Hirokazu,Sato, Fumie
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p. 1673 - 1681
(2007/10/03)
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- CARBON-ACYLATIONS IN THE PRESENCE OF MAGNESIUM OXIDE. A SIMPLE SYNTHESIS OF METHANETRICARBOXYLIC ESTERS
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Magnesium oxide is an effective reagent for the carbon-acylation of malonates with either acyl chlorides or chloroformates.Various malonic esters (methyl, ethyl, isopropyl and isobutyl) were easily alkoxycarbonylated to give the corresponding methanetricarboxylic esters.The reaction scope and limitations have been elaborated.
- Skarzewski, Jacek
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p. 4593 - 4598
(2007/10/02)
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