DayangChem exported this product to many countries and regions at best price. If you are looking for the material's manufacturer or supplier in China, DayangChem is your best choice. Pls contact with us freely for getting detailed product spe
Cas:490-83-5
Min.Order:1 Kilogram
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Type:Lab/Research institutions
inquiry1. Factory price and high quality must be guaranteed, base on 8 years of production and R&D experience2. Free samples will be provided,ensure specifications and quality are right for customer3. Customers will receive the most professional technical s
Cas:490-83-5
Min.Order:1 Gram
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Type:Manufacturers
inquiryOur main production base is located in Xuzhou industry park. We are certified both to the ISO 9001 and ISO 14001 Standards, have a safety management system in place.Our R&D team masters core technology for process-design of target building block
Cas:490-83-5
Min.Order:5 Kiloliter
FOB Price: $1.2 / 5.0
Type:Manufacturers
inquiryWITH US,YOUR MONEY IN SAFE,YOUR BUSINESS IN SAFE 1)Quick Response Within 12 hours; 2)Quality Guarantee: All products are strictly tested by our QC, confirmed by QA and approved by third party lab in China, USA, Canada, Germany, UK, Italy, France et
Cas:490-83-5
Min.Order:1 Kilogram
FOB Price: $139.0 / 210.0
Type:Trading Company
inquiry1. Product advantages High purity, all above 98.5%, no impurities after dissolution We will test each batch to ensure quality OEM and private brand services designed for free Various cap colors available We can also provide MT1 peptide powd
Cas:490-83-5
Min.Order:1 Kilogram
FOB Price: $80.0 / 89.0
Type:Trading Company
inquiry1.No Less 8 years exporting experience. Clients can 100% received goods 2.Lower Price with higher quality 3,Free sample 4,We are sincerely responsible for the "product quality" and "After Service" Upbio is Specialized
Cas:490-83-5
Min.Order:1 Kilogram
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Type:Lab/Research institutions
inquiryHenan Wentao Chemical Product Co.,Ltd is Located in Zhengzhou High-tech Development Zone with import and export license, We passed ISO 9001:2008 as well, Henan Wentao has developed more than 1000 compounds, which are widely used in the fields of prod
Cas:490-83-5
Min.Order:0
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Type:Lab/Research institutions
inquirysuperior quality Appearance:Orange Solid Storage:Stored in cool, dry and ventilation place; Away from fire and heat Package:1kg/bag, 1kg/drum or 25kg/drum or as per your request. Application:The reversibly oxidized form of ascorbic acid. Transporta
Cas:490-83-5
Min.Order:1 Metric Ton
Negotiable
Type:Trading Company
inquiryJ&H CHEM R&D center can offer custom synthesis according to the contract research and development services for the fine chemicals, pharmaceutical, biotechnique and some of the other chemicals. J&H CHEM has some Manufacturing base in Jia
Cas:490-83-5
Min.Order:0
Negotiable
Type:Lab/Research institutions
inquiryProduct Name: DEHYDROASCORBIC ACID Synonyms: (5R)-5β-[(S)-1,2-Dihydroxyethyl]tetrahydrofuran-2,3,4-trione;C05422;Dehydroascorbate;L-Dehydroascorbate;L-threo-2,3-Hexodiulosonic Acid γ-Lactone;Oxidized Ascorbic Acid;OXIDIZED V
Cas:490-83-5
Min.Order:1 Metric Ton
FOB Price: $20.0
Type:Lab/Research institutions
inquiryProduct Details Grade: pharmaceutical grade Purity:99%+ ProductionCapacity: 1000 Kilogram/Month Scope of use: For scientific research only(The product must be used legally) Our Advantage 1. Best quality with competitive price. 2. Quick shipping,
Cas:490-83-5
Min.Order:1 Gram
Negotiable
Type:Lab/Research institutions
inquiryHigh quality, competitive price, fast delivery and first-class service we possesses have won the trust and praise of customers. Standard: BP/USP/EP The purity is equal or greater than 99%. As a supplier, we can provide high-quality products. Cle
Cas:490-83-5
Min.Order:1 Metric Ton
Negotiable
Type:Lab/Research institutions
inquiryZhenyu biotech exported this product to many countries and regions at best price. if you are looking for the material's manufacturer or supplier in china, zhenyu biotech is your best choice. pls contact with us freely for getting detailed
Cas:490-83-5
Min.Order:1 Kilogram
FOB Price: $2.0
Type:Lab/Research institutions
inquiryShandong Mopai Biotechnology Co., LTD is a leading manufacturer and supplier of chemicals in China. We develop produce and distribute high quality pharmaceuticals, intermediates, special chemicals and OLED intermediates and other fine chemicals. W
Cas:490-83-5
Min.Order:1 Gram
Negotiable
Type:Lab/Research institutions
inquirySAGECHEM is a chemical R&D, manufacturing and distribution company in China since 2009, including pharmaceutical intermediates, agrochemical, dyestuff intermediates, organosilicone, API and etc. We also offer a full range of services in custom synthe
Cas:490-83-5
Min.Order:0
Negotiable
Type:Lab/Research institutions
inquiryStock products, own laboratory Package:Grams, Kilograms Application:For R&D Transportation:According to customer request Port:Shanghai
Cas:490-83-5
Min.Order:0
Negotiable
Type:Lab/Research institutions
inquiryLower price, sample is available,SDS test documents are available,large stock in warehouseAppearance:White powder Storage:Sealed and preserved Package:200/Kilograms Application:Fine chemical intermediates, used as the main raw material for the synthe
high purity lowest priceAppearance:solid or liquid Storage:in sealed air resistant place Package:drum and bag Application:for pharma use Transportation:by sea or air Port:Beijing or Guangzhou
Acmec is a leading manufacturer and supplier of biochemical reagents and life science products. We have over 40,000 items in stock (real-time inventory) and offer discounted prices to registered members of the online store ( www.acmec.com.cn ) Appea
Cas:490-83-5
Min.Order:1 bottle
Negotiable
Type:Lab/Research institutions
inquiryhigh quality Storage:Sealed, dry, microtherm , avoid light and smell. Package:According to the demand of customer Application:Organic synthesis Transportation:by air or by sea
Hunan chemfish Pharmaceutical co.,Ltd.located in Lugu High-tech industral park ,Hunan province . with its own R&D center and more than 10000㎡manufacture plant . Chemfish owns 40 reactors from 1000L to 8000L. With complete auxiliary equipment as
hight degree of purity Application:Fine chemical intermediates, used as the main raw material for he synthesis of various pesticides, medicines, surfactants, polymer monomers, Ond Ontifungal agents
Cas:490-83-5
Min.Order:0
Negotiable
Type:Lab/Research institutions
inquirybulk productionChemsigma International Co.,Ltd. is a chemical manufacturer, specialize in custom synthesis and organic chemical manufacturing for overseas customers, in the field of API, pharmaceutical intermediates, chemical intermediates, fine chem
L-threo-2,3-Hexodiulosonicacid, g-lactoneAppearance:white crystalline powder Storage:Store in dry, dark and ventilated place Package:25KG drum Application:intermediate Transportation:by air, by sea, by express
good quality, competitive price, thoughtful after sale serviceAppearance:white powder Storage:Keep it in dry,shady and cool place Package:50mg Application:Pharma;Industry;Agricultural;chemical reaserch Transportation:by express or by sea Port:Any por
Provide HPLC,HNMR,MS and COA. Package:Glass bottles Application:scientific research Transportation:by air
factory?direct?saleAppearance:White powder Storage:Sealed and preserved Package:200/Kilograms Application:healing drugs Transportation:By sea Port:Shanghai/tianjin
1.Professional synthesis laboratory and production base. 2.Strong synthesis team and service team. 3.Professional data management system. 4.We provide the professional test date and product information ,ex. HNMR ,CNMR,FNMR, HPLC/G
Cas:490-83-5
Min.Order:10 Milligram
Negotiable
Type:Lab/Research institutions
inquiryChangzhou Extraordinary Pharmatech co., LTD. As a leading chemical manufacturer and supplier in China.DAS authentication is passed.We can provide the popular precursor chemicals, we have our own strong R & D team, have our own laboratories and fa
Cas:490-83-5
Min.Order:1 Gram
Negotiable
Type:Lab/Research institutions
inquiryConditions | Yield |
---|---|
With N-bromosaccharin; acetic acid for 0.0333333h; Ambient temperature; | 100% |
With hexacyanoferrate(III) In water at 25℃; Mechanism; Rate constant; influence of pH (-1 to 1), ionic strength; | |
With starch-KI; chloroamine-T Product distribution; conditions for analytical determination, other halogenide used; |
2,3-Dimethoxy-5-methyl-1,4-benzoquinone
ascorbic acid
A
2,3-dimethoxy-5-methylbenzene-1,4-diol
B
L-dehydroascorbic acid
Conditions | Yield |
---|---|
With acetate-phosphate buffer at 25℃; Rate constant; Mechanism; Thermodynamic data; pH 3.0; var. pH; var. temps.; ΔS(excit.), ΔH(excit.), ΔG(excit.); |
[bis(acetoxy)iodo]benzene
ascorbic acid
A
iodobenzene
B
acetic acid
C
L-dehydroascorbic acid
Conditions | Yield |
---|---|
In acetic acid at 24.9℃; Rate constant; Thermodynamic data; Equilibrium constant; other temperatures; ΔH(excit.), ΔG(excit.), ΔS(excit.), ΔH, ΔG, ΔS; | |
In water; acetic acid at 31.9℃; Thermodynamic data; Kinetics; Mechanism; velocity constants, further temp., var. conc. of educts, activation energy, formation konstant K, ΔH(excit.), ΔG(excit.), ΔS(excit.), ΔH, ΔS, ΔG, effect of variation of solvent (var. percentage of HOAc in water, 318 K); |
4-chloro-1-(diacetoxyiodo)benzene
ascorbic acid
A
1-Chloro-4-iodobenzene
B
acetic acid
C
L-dehydroascorbic acid
Conditions | Yield |
---|---|
In acetic acid at 24.9℃; Rate constant; Thermodynamic data; Equilibrium constant; other temperatures; ΔH(excit.), ΔG(excit.), ΔS(excit.), ΔH, ΔG, ΔS; |
(3-chlorophenyl)iodanediyl diacetate
ascorbic acid
A
3-iodochlorobenzene
B
acetic acid
C
L-dehydroascorbic acid
Conditions | Yield |
---|---|
In acetic acid at 24.9℃; Rate constant; Thermodynamic data; Equilibrium constant; other temperatures; ΔH(excit.), ΔG(excit.), ΔS(excit.), ΔH, ΔG, ΔS; |
(4-nitrophenyl)-λ3-iodanediyl diacetate
ascorbic acid
A
p-nitrobenzene iodide
B
acetic acid
C
L-dehydroascorbic acid
Conditions | Yield |
---|---|
In acetic acid at 24.9℃; Rate constant; Thermodynamic data; Equilibrium constant; other temperatures; ΔH(excit.), ΔG(excit.), ΔS(excit.), ΔH, ΔG, ΔS; |
m-(diacetoxyiodo)toluene
ascorbic acid
A
3-Iodotoluene
B
acetic acid
C
L-dehydroascorbic acid
Conditions | Yield |
---|---|
In acetic acid at 24.9℃; Rate constant; Thermodynamic data; Equilibrium constant; other temperatures; ΔH(excit.), ΔG(excit.), ΔS(excit.), ΔH, ΔG, ΔS; |
1-(diacetoxyiodo)-4-methylbenzene
ascorbic acid
A
4-tolyl iodide
B
acetic acid
C
L-dehydroascorbic acid
Conditions | Yield |
---|---|
In acetic acid at 24.9℃; Rate constant; Thermodynamic data; Equilibrium constant; other temperatures; ΔH(excit.), ΔG(excit.), ΔS(excit.), ΔH, ΔG, ΔS; |
3-nitro(diacetoxyiodo)benzene
ascorbic acid
A
m-iodonitrobenzene
B
acetic acid
C
L-dehydroascorbic acid
Conditions | Yield |
---|---|
In acetic acid at 24.9℃; Rate constant; Thermodynamic data; Equilibrium constant; other temperatures; ΔH(excit.), ΔG(excit.), ΔS(excit.), ΔH, ΔG, ΔS; |
4-methoxy(diacetoxyiodo)benzene
ascorbic acid
A
para-iodoanisole
B
acetic acid
C
L-dehydroascorbic acid
Conditions | Yield |
---|---|
In acetic acid at 24.9℃; Rate constant; Thermodynamic data; Equilibrium constant; other temperatures; ΔH(excit.), ΔG(excit.), ΔS(excit.), ΔH, ΔG, ΔS; |
(4-bromophenyl)-λ3-iodanediyl diacetate
ascorbic acid
A
1,4-bromoiodobenzene
B
acetic acid
C
L-dehydroascorbic acid
Conditions | Yield |
---|---|
In acetic acid at 24.9℃; Rate constant; Thermodynamic data; Equilibrium constant; other temperatures; ΔH(excit.), ΔG(excit.), ΔS(excit.), ΔH, ΔG, ΔS; |
ascorbic acid
A
(4R,5S)-4,5,6-Trihydroxy-2,3-dioxo-hexanoic acid
C
L-dehydroascorbic acid
Conditions | Yield |
---|---|
With dihydrogen peroxide; copper(II) sulfate In water Product distribution; degradation of ascorbic acid in H2O2 and cupric ion solutions, oxidation with different oxygen sources, possible oxidation products, effect of cupric ion, GC/MS study; |
Conditions | Yield |
---|---|
With superoxide ion In acetonitrile Mechanism; Rate constant; Ambient temperature; variarion of solvent and oxidizing agent, effect of Fe(3+); |
3,5-di-tert-butyl-o-benzoquinone
A
3,5-Di-tert-butylcatechol
B
L-dehydroascorbic acid
Conditions | Yield |
---|---|
With ascorbic acid In methanol Rate constant; |
Conditions | Yield |
---|---|
With oxygen In methanol at 25℃; for 1h; Product distribution; |
A
α‑tocopherol quinone
B
vitamin E
D
ascorbic acid
E
L-dehydroascorbic acid
Conditions | Yield |
---|---|
With water In methanol for 24h; Mechanism; var. pH and time; |
Conditions | Yield |
---|---|
With hydrogenchloride; 1,4-dithio-erythritol In water at 30℃; for 1h; Product distribution; other reagent (pH dependence); |
Conditions | Yield |
---|---|
beim Leiten von Luft; | |
mit UV-Licht.Irradiation; | |
bei Einwirkung von γ-Strahlen; | |
untersucht wurde der zeitliche Verlauf der Reaktion mit Methylenblau bei Belichtung; |
Conditions | Yield |
---|---|
bei der elektrochemischen Oxydation an einer Platin-Anode; |
1,4-dioxane
water
cis-nitrous acid
ascorbic acid
L-dehydroascorbic acid
Conditions | Yield |
---|---|
Rate constant; |
water
ozone
acetic acid
ascorbic acid
L-dehydroascorbic acid
diethyl ether
water
p-benzoquinone
ascorbic acid
L-dehydroascorbic acid
Conditions | Yield |
---|---|
unter Ausschluss von Sauerstoff; |
Conditions | Yield |
---|---|
Rate constant; |
Conditions | Yield |
---|---|
untersucht wurde der zeitliche Verlauf; |
Conditions | Yield |
---|---|
In methanol; water for 0.5h; Heating; | 80% |
1,2-diamino-benzene
L-dehydroascorbic acid
3-(1,2,3-trihydroxy-propyl)-quinoxaline-2-carboxylic acid 2-amino-anilide
Conditions | Yield |
---|---|
In methanol at 40℃; for 2h; | 76% |
Conditions | Yield |
---|---|
In methanol; water for 0.5h; Heating; | 75% |
3,5-dimethoxyphenol
L-dehydroascorbic acid
(3R,3aR,8bS)-3-((S)-1,2-dihydroxyethyl)-3a,8b-dihydroxy-6,8-dimethoxy-3,3a-dihydrofuro[3,4-b]benzofuran-1(8bH)-one
Conditions | Yield |
---|---|
With acetic acid In tetrahydrofuran stereoselective reaction; | 72% |
3,5-dihydroxyphenol
L-dehydroascorbic acid
(3R,3aR,8bS)-3-((S)-1,2-dihydroxyethyl)-3a,6,8,8b-tetrahydroxy-3,3a-dihydrofuro[3,4-b]benzofuran-1(8bH)-one
Conditions | Yield |
---|---|
With acetic acid In tetrahydrofuran stereoselective reaction; | 69% |
(2-nitrophenyl)hydrazine
L-dehydroascorbic acid
L-threo-2,3-hexodiulosono-1,4-lactone 2,3-bis(o-nitrophenylhydrazone)
Conditions | Yield |
---|---|
With acetic acid In water at 100℃; for 0.5h; | 67.5% |
(2-chlorophenyl)hydrazine
L-dehydroascorbic acid
L-threo-2,3-Hexodiulosono-1,4-lacton-2-(o-chlor-phenylhydrazon)
Conditions | Yield |
---|---|
In water at 20℃; for 24h; | 60% |
Conditions | Yield |
---|---|
With disodium hydrogenphosphate; citric acid In methanol; water at 20℃; for 168h; | 60% |
(2-nitrophenyl)hydrazine
L-dehydroascorbic acid
L-threo-2,3-hexodiulosono-1,4-lactone 2-(o-nitrophenylhydrazone)
Conditions | Yield |
---|---|
In water for 24h; Ambient temperature; | 55% |
2-(hydroxymethyl)indole
L-dehydroascorbic acid
(3R,3aR,10cS)-3-[(1S)-1,2-dihydroxyethyl]-3a,10c-dihydroxy-3a,5,6,10c-tetrahydrofuro[3',4':5,6]pyrano[3,4-b]indol-1(3H)-one
Conditions | Yield |
---|---|
With disodium hydrogenphosphate; citric acid In methanol; water at 20℃; for 168h; | 50% |
3,4-dihydro-2H-chromene-5,7-diol
L-dehydroascorbic acid
A
(6bS,9R,9aR)-9-((S)-1,2-dihydroxyethyl)-6,6b,9a-trihydroxy-2,3,9,9a-tetrahydro-1H-furo[3',4':4,5]furo[2,3-f]chromen-7(6bH)-one
B
(7aR,8R,10aS)-8-((S)-1,2-dihydroxyethyl)-5,7a,10a-trihydroxy-3,4,7a,8-tetrahydro-2H-furo[3',4':4,5]furo[2,3-h]chromen-10(10aH)-one
Conditions | Yield |
---|---|
With acetic acid In tetrahydrofuran regioselective reaction; | A 25% B 47% |
3-bromophenylhydrazine hydrochloride
L-dehydroascorbic acid
L-threo-2,3-hexodiulosono-1,4-lactone-2-m-bromophenylhydrazone
Conditions | Yield |
---|---|
With sodium acetate In ethanol at 20℃; Condensation; | 20% |
Conditions | Yield |
---|---|
In ethanol for 0.833333h; Heating; | 11% |
Conditions | Yield |
---|---|
With pyridine |
acetic anhydride
L-dehydroascorbic acid
(3aR,6aR,12aR)-3c,5a,9c,11a-tetraacetoxy-(3ar,5at,9ac,11at)-tetrahydro-1,4,6,7,10,12-hexaoxa-dicyclopent[c,i]-s-indacene-5,11-dione
Conditions | Yield |
---|---|
With sulfuric acid | |
With pyridine |
phenylhydrazine hydrochloride
L-dehydroascorbic acid
L-threo-2,3-hexodiulosono-1,4-lactone 2-(phenylhydrazone)
Conditions | Yield |
---|---|
With water |
benzoyl chloride
L-dehydroascorbic acid
(3aR,6aR,12aR)-3c,5a,9c,11a-tetrakis-benzoyloxy-(3ar,5at,9ac,11at)-tetrahydro-1,4,6,7,10,12-hexaoxa-dicyclopent[c,i]-s-indacene-5,11-dione
Conditions | Yield |
---|---|
With pyridine |
acetyl chloride
L-dehydroascorbic acid
(3aR,6aR,12aR)-3c,5a,9c,11a-tetraacetoxy-(3ar,5at,9ac,11at)-tetrahydro-1,4,6,7,10,12-hexaoxa-dicyclopent[c,i]-s-indacene-5,11-dione
Conditions | Yield |
---|---|
With pyridine |
ethanol
1,2-diamino-benzene
L-dehydroascorbic acid
(R)-2-((S)-1,2-dihydroxy-ethyl)-furo[2,3-b]quinoxalin-3-one
Conditions | Yield |
---|---|
Verb. 1: 1 Mol; |
1,2-diamino-benzene
L-dehydroascorbic acid
N-(2-aminophenyl)-3-[(1S,2S)-1,2,3-trihydroxypropyl]quinoxaline-2-carboxamide
phenylhydrazine
L-dehydroascorbic acid
L-threo-2,3-hexodiulosono-1,4-lacton 2,3-bis(phenylhydrazone)
Conditions | Yield |
---|---|
With sodium acetate | |
With hydrogenchloride; sodium acetate | |
With acetic acid |
Conditions | Yield |
---|---|
With pyridine; benzene |
(2,4-dinitro-phenyl)-hydrazine
L-dehydroascorbic acid
dehydro-L-ascorbic acid bis((2,4-dinitrophenyl)hydrazone)
Conditions | Yield |
---|---|
With ethanol; sulfuric acid | |
With hydrogenchloride | |
With sulfuric acid; meta-phosphoric acid; tin(ll) chloride at 37℃; for 3h; | 0.46 g |
4-aminosulfonylphenylhydrazine
L-dehydroascorbic acid
(S)-5-((S)-1,2-dihydroxy-ethyl)-furan-2,3,4-trione-3,4-bis-(4-sulfamoyl-phenylhydrazone)
Conditions | Yield |
---|---|
With acetic acid |
Conditions | Yield |
---|---|
at 17℃; Rate constant; in gepufferten wss. Loesungen vom pH 0.7 - 3.8; | |
in schwach sauren wss. Loesungen; | |
at 0 - 100℃; Rate constant; in gepufferter wss. Loesung vom pH 2.2; |
L-dehydroascorbic acid
(S)-2,3,4,5-tetrahydroxy-pent-2-enal
Conditions | Yield |
---|---|
(i) H2O, (ii) (decarboxylation); Multistep reaction; |
Conditions | Yield |
---|---|
In ethanol at 80℃; for 0.25h; Product distribution; Mechanism; also in the absence of ascorbic acid and/or dehydroascorbic acid; |
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