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National Center for Biotechnology Information 8600 Rockville Pike Bethesda MD 20894 USA Contact Policies FOIA HHS Vulnerability Disclosure National Library of Medicine National Institutes of Health Department of Health and Human Services
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A salt or ester of a xanthic acid especially a simple xanthic acid salt as of sodium or potassium used as a flotation collector for copper silver and gold noun 1 0 A salt or ester of xanthic acid noun 0 0 chemistry Any salt or ester of xanthic acid noun 0 0 Advertisement Other Word Forms Noun Singular xanthate Plural xanthates
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𝐃𝐨𝐰𝐧𝐥𝐨𝐚𝐝 𝐀𝐓𝐏 𝐒𝐓𝐀𝗥 𝐀𝐩𝐩 𝐟𝐨𝐫 Unlimited free practice for IIT 𝐉𝐄𝐄 📱 𝐀𝐓𝐏 𝐒𝐓𝐀𝗥 𝗔𝗽𝗽
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The xanthate esters are of interest in that if the O alkyl group contains at least one a hydrogen atom pyrolysis produces an olefin a thiol and carbon oxysul phide the Chugaev reaction Section p 489 [] Isolation of the intermediate xanthate salts in the preparation of the xanthate esters is not essential
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National Center for Biotechnology Information 8600 Rockville Pike Bethesda MD 20894 USA Contact Policies FOIA HHS Vulnerability Disclosure National Library of Medicine National Institutes of Health Department of Health and Human Services
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Sodium and Potassium xanthate salts Human health tier II assessment 10 March 2024 Chemicals in this assessment Chemical Name in the Inventory CAS Number Carbonodithioic acid O ethyl ester potassium salt 140 89 6 Carbonodithioic acid O 1 methylethyl ester potassium salt 140 92 1 Carbonodithioic acid O 1 methylethyl ester sodium salt
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Jul 7 2022Potassium ethyl xanthate is used in the mining industry as flotation agent for extraction of the ores of copper nickel and method exploits the affinity of these soft metals for the organosulfur ligand Potassium xanthate is a useful reagent for preparing xanthate esters from alkyl and aryl halides
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Sodium or potassium xanthates dissolved in water undergoes hydrolysis giving alkaline reaction When xanthates are produced as a water solutions exes of alkali hydroxide is kept pH >10 as a decomposition inhibitor Human information Xanthates dust or mist from solution cause irritation to the nose throat and upper respiratory tract
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O Butyl S methyl dithiocarbonate 1e the xanthate ester derived from the aliphatic alcohol n butanol also gave the corresponding O butyl 4 fluorobenzyl carbamothioate and O butyl 4 chlorobenzyl carbamothioate 4i and 4j in 74% and 79% yield respectively from the reactions with 4 fluorobenzylamine 5c and 4 chlorobenzylamine 5d
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xanthate ester allylique 09 05 2024 · Alkyl xanthate esters are perhaps best known for their use in deoxygenation chemistry However their use in cross coupling chemistry has not been productive which is due in part to inadequate xanthate activation strategies Herein we report the use of O benzyl xanthate esters readily derived from
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Alkyl xanthate esters are perhaps best known for their use in deoxygenation chemistry However their use in cross coupling chemistry has not been productive which is due in part to inadequate xanthate activation strategies Herein we report the use of O benzyl xanthate esters readily de …
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Xanthate esters of the form ##EQU1## where R is an alkyl function having at least one H in a position alpha to the R O bond C n is a linear alkyl function either substituted or unsubstituted with n = 1 3 X has a basicity greater than the >C = S function and comprises a C or S containing functional group having at least one double or triple bond to a hetero atom the functional group
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Hydroxyl groups can easily be transformed into methyl xanthate esters by several methods and are commonly used as an auxiliary in the Barton McCombie reaction What is Xanthic acid 1a a colorless unstable oily thio acid C 2 H 5 OCSSH obtained in the form of its potassium salt by reaction of potassium ethoxide with carbon disulfide O ethyl dithio carbonate
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US3155701A US247275A US24727562A US3155701A US 3155701 A US3155701 A US 3155701A US 247275 A US247275 A US 247275A US 24727562 A US24727562 A US 24727562A US 3155701 A US3155701 A US 3155701A Authority US United States Prior art keywords xanthate methyl ethyl parts oxopentyl Prior art date 1962 12 26 Legal status The legal status is an assumption and is not a legal conclusion
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What are Xanthates Xanthate is a kind ofsalt chemical which has a slight golden yellow color because it comes from the word Xanthos which is Greek for golden yellowish Xanthates are types of organosulfur compounds and have very odd odor Xanthates are very important in producing cellophane and polymers from cellulose
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Allylation is the attachment of an allyl group to a substrate usually another organic compound Classically allylation involves the reaction of a carbanion with allyl chloride Another well developed process involves addition of allyltrimethylsilane to carbonyls carbonyl allylation
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11 downloads 142 Views 205KB Size Download PDF ORGANIC LETTERS Radical Deoxygenation of Xanthates and Related Functional Groups with New Minimalist N Heterocyclic Carbene Boranes 2024 Vol 12 No 13 3002 3005 Shau Hua Ueng † Louis Fensterbank ‡ Emmanuel Lacoˆte ‡ Max Malacria ‡ and Dennis P Curran † Department of Chemistry
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The products thus obtained were compared with the carbamothioates obtained by the sodium hydride mediated condensation of the corresponding benzylamines and xanthate esters in DMF To account for these unexpected reactions a mechanism is proposed in which the key steps are supported by quantum chemical calculations
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A dehydrative allylation of allyl alcohol with amines provides various allyl amines in the presence of MoO 3 /TiO 2 as solid catalyst The catalyst can be reused three times without loss of activity Y Kon T Nakashima T Fujitani T Murayama W Ueda Synlett 2024 30 287 292 A phosphine borane compound is an effective ligand for
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The methyl xanthate ester is presented as a versatile protective group for alcohols Hydroxyl groups can easily be transformed into methyl xanthate esters by several methods and are commonly used as an auxiliary in the Barton McCombie reaction What is a cellulose xanthate
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Xanthate esters also known as 0 S dialky dithiocarbonates are yellow foul smelling compounds that are useful in a variety of chemical processes The conventional method of xanthate synthesis involves the use of xanthate salts which have been know since These salts are easily prepared from the nucleophilic addition of an alkoxide to
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The chemical nature of starch xanthate SX polyethylenimine PEI reaction products has been studied because of their effectiveness as wet‐end additives for improving strength properties of paper Model compounds in conjunction with ultraviolet infrared and chemical analyses served to elucidate SX PEI reaction mechanisms Aqueous solutions of SX degrees of substitution
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Short description Chemical name Potassium Ethyl Xanthate PEX Shipping name Carbonodithioic Acid O ethyl ester Potassium salt Chemical formula CH3CH2OC Molecular weight CAS NO 140 89 6 EINECS Number 205 439 3 Physical Yellow or light gray powder or powder flowing freely and soluble in water
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Contextual translation of allylique into English Human translations with examples allyl allylic allyl resin allyl ester allyl alcohol allyl compound
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Xanthate anions also undergo alkylation to give xanthate esters which are generally stable [4] ROCS2K R X ROC S SR KX The C O bond in these compounds are susceptible to cleavage by the BartonMcCombie deoxygenation which provides a means for deoxygenation of alcohols They can be oxidized to the so called dixanthogens
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Jun 2 2021Abstract N alkylation of amines by the reaction with xanthate esters in the presence of acetic acid catalyst in ethanol is reaction time high yield general applicability and environmentally benign nature are the noteworthy features of our protocol
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Xanthate salts are produced by the reaction of an alcohol with sodium or potassium hydroxide and carbon disulfide [2] [3] ROH CS2 KOH ROCS2K H2O The reaction involves the attack of the alkoxide salt For example sodium ethoxide gives sodium ethyl xanthate
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Allyl Amyl Xanthate Ester Date Posted 2024 10 17 11 30 From English Site Valid to 2024 11 30 Purchase Quantity 1 Bag s Trade Terms FOB Sourcing Request From United States Quote Now Quote Left 10 Product Description Buyer Business Info CAS Number 2956 12 9 I need to test this material and will have much larger quantities after trials
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sized from xanthate esters but the methodology described is limited to only a few examples with aliphatic substituents and furthermore suffers from a tedious isolation protocol [18] As a part of our work on the development of new synthetic methods [26 30] we have recently reported the synthesis of thiazoles from xanthate esters [31]
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any of several colorless esters obtained usually as alkali salts in the form of orange colored crumbs by xanthation of alkali cellulose with… See the full definition Post the Definition of cellulose xanthate to Facebook Share the Definition of cellulose xanthate on Twitter Dictionary Entries Near cellulose xanthate cellulose propionate
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