Dayangchem's 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. DayangChem can provide different quantities
Cas:504-31-4
Min.Order:1 Kilogram
FOB Price: $3.0
Type:Lab/Research institutions
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
WITH 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:504-31-4
Min.Order:1 Kilogram
FOB Price: $139.0 / 210.0
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:504-31-4
Min.Order:1 Kilogram
Negotiable
Type:Lab/Research institutions
inquiryALPHA-PYRONE CAS:504-31-4 Qingdao Belugas Import and Export Co., Ltd. is a scientific and technological company integrating research and development, production and trade of chemical intermediates, specializing in high quality organic intermediates,
Cas:504-31-4
Min.Order:1 Gram
Negotiable
Type:Lab/Research institutions
inquiryHello, dear friend! I'm Hansen and Allen from China. Welcome to my lookchem mall! The following is a brief introduction of our company's products and services. If you are interested in our products, please contact us by emai
Henan 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
Hangzhou KeyingChem Co., Ltd. exported this product to many countries and regions at best price. If you are looking for the material’s manufacturer or supplier in China, KeyingChem is your best choice. Pls contact with us freely for getting det
J&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
Zibo Hangyu Biotechnology Development 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 chemi
Cas:504-31-4
Min.Order:10 Gram
FOB Price: $100.0
Type:Lab/Research institutions
inquiryWe Huarong Pharm can provide Customized Synthesis & Process R&D & APIs and intermediates Production & Quality Research & Registration Application, especially our GMP validation service which complies with SFDA, FDA, WHO and EU EMPA. O
Lower 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
R & D enterprises have their own stock in stock Package:1kg Application:pharmaceutical intermediates
high 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
1.Our services:A.Supply sampleB.The packing also can be according the customers` requirmentC.Any inquiries will be replied within 24 hoursD.we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate.
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
Ansciep Chemical is a professional enterprise manufacturing and distributing fine chemicals and speciality chemicals. We have been dedicated to heterocycle compounds and phenyl rings for tens of years. This is our mature product for export. Our quali
We product this chemical more than 10 years . We are very experience to export it to many countries, Our superior & stable quality , competitive price gain warm reception from our customers. Application:Chemical intermediate
2H-PYRAN-2-ONEAppearance:white crystalline powder Storage:Store in dry, dark and ventilated place Package:25KG drum Application:intermediate Transportation:by air, by sea, by express
factory?direct?saleAppearance:White powder Storage:Sealed and preserved Package:200/Kilograms Application:healing drugs Transportation:By sea Port:Shanghai/tianjin
1. Timely and efficient service to ensure communication with customers2. Produce products of different specifications and sizes according to your requirements.3. Quality procedures and standards recognized by SGS. Advanced plant equipment ensures sta
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factory?direct?saleAppearance:White powder Storage:Sealed and preserved Package:200/Kilograms Application:healing drugs Transportation:By sea Port:Shanghai/tianjin
Best Seller, High Quality, Competitive Price, Fast Delivery, Quick ResponseAppearance:powder, or liquid Storage:Stored in room temperature, ventilated place Package:Bottle, barrel, cargo, container, etc. Application:Pharmaceuticals, intermediates, AP
Price, service, company and transport advantage: 1. Best service, place of origin China, high quality, and reasonable price. 2. It's customers' right to choose the package (EMS, DHL, FEDEX, UPS). 3. It's customers' right
United Scientific Company Located in Shanghai of China , is a competitive player in the global specialty and fine chemical market. Fenghua has both the expertise and flexibility to produce a wide range of chemicals. Focusing on developing the innovat
Joyinchem have been committed to chemical supply for several years and have built good cooperation records with multinational chemical corporations and importers from all over the world. Our services include:-Spot goods-Contract manufacturing-Custom
2H-Pyran-2-one Storage:keep in dry and cool condition Package:25kg or according to cutomer's demand Application:Chemical research/pharma intermediate Transportation:By Sea,by Air,By courier like DHL or Fedx. Port:Shanghai/Shenzhen
FINETECH INDUSTRY LIMITED is a LONDON based CRO company providing drug discovery & development services to worldwide clients. FINETECH INDUSTRY LIMITED supplies the ALPHA-PYRONE, CAS:504-31-4 with the most competitive price and the best quality. We c
1.We have rich experience in the development and production 2.Our factory is in Shanghai of China,We have convenient traffic conditions.3.We have advanced testing equipment and shipping line. Package:5g, 10g, 50g, 100g, 1kg Application:Pharmaceutical
5-bromo-5,6-dihydro-2H-pyran-2-one
pyran-2-one
Conditions | Yield |
---|---|
With triethylamine In toluene at 5 - 40℃; | 89% |
With triethylamine for 0.5h; Dehydrobromination; Heating; | 70% |
With triethylamine Yield given; |
hexane-3,4-cis-diol-2,5-dione
pyran-2-one
Conditions | Yield |
---|---|
With sodium dihydrogenphosphate; sodium hydroxide In acetic acid butyl ester; water at 80℃; for 12h; | 79.7% |
3-bromo-2H-pyran-2-one
lithium dimethylcuprate
A
3-methyl-2H-pyran-2-one
B
pyran-2-one
Conditions | Yield |
---|---|
In diethyl ether at -78℃; for 2h; Yields of byproduct given; | A 5% B n/a |
Conditions | Yield |
---|---|
With copper |
Conditions | Yield |
---|---|
With copper at 650℃; under 5 Torr; |
5-diazo-1,3-cyclopentadiene
A
pyran-2-one
B
cyclopentadienone
C
cyclopentadienylidene
D
(Z)-5-Oxo-penta-2,4-dienal
Conditions | Yield |
---|---|
With oxygen at -253.2℃; Mechanism; Irradiation; other temperatures, different λ, reaction with (18)O(16)O and (18)O2; |
5-diazo-1,3-cyclopentadiene
A
pyran-2-one
B
cyclopentadienone
C
(Z)-5-Oxo-penta-2,4-dienal
Conditions | Yield |
---|---|
With oxygen In solid matrix at -253.2℃; Product distribution; Mechanism; Irradiation; further with <18O>O2; |
Conditions | Yield |
---|---|
at 620℃; |
exo-4,5-epoxy-exo-10-oxatricyclo<5.2.1.02,6>deca-8-en-3-one
A
pyran-2-one
4,5-epoxy-2-cyclopentenone
Conditions | Yield |
---|---|
under 0.04 Torr; for 1.5h; flash vacuum thermolysis; T1 75 deg C / T2 375 deg C; Yield given; |
cyclopentadienone O-oxide
A
pyran-2-one
B
cyclopentadienone
C
(Z)-5-Oxo-penta-2,4-dienal
D
cyclopentadienone oxide
Conditions | Yield |
---|---|
Mechanism; Irradiation; |
pyran-2-one
Conditions | Yield |
---|---|
Beim Destillieren im Wasserstoffstrom; |
3-oxabicyclo<3.2.0>hept-6-ene-2,4-dione
A
2-oxa-3-oxobicyclo[2.2.0]hex-5-ene
B
pyran-2-one
C
1,3-cyclobutadiene
D
(Z)-5-Oxo-penta-2,4-dienal
Conditions | Yield |
---|---|
In solid matrix at -269.2 - -248.2℃; Product distribution; Mechanism; Irradiation; irradiation with 248 nm, subsequent bleaching with 254- and 313 nm light destroys part of products; also with isotopomers; |
3-oxabicyclo<3.2.0>hept-6-ene-2,4-dione
A
3-buten-1-yne
B
pyran-2-one
C
cyclopentadienone
Conditions | Yield |
---|---|
at 850℃; Product distribution; detection on argon matrix, 10 K; |
6-methoxy-2H-pyran-3(6H)-one
pyran-2-one
Conditions | Yield |
---|---|
Multi-step reaction with 4 steps 1: 90 percent / LiAlH4 / diethyl ether / 0.5 h / -60 °C 2: 72 percent / NBS; Me2S / CH2Cl2 / 1 h / 0 °C 3: 90 percent / Jones reagent / acetone / 0.5 h 4: 70 percent / Et3N / 0.5 h / Heating View Scheme |
6-hydroxy-3,6-dihydro-2H-pyran-3-one
pyran-2-one
Conditions | Yield |
---|---|
Multi-step reaction with 5 steps 1: 75 percent / Ag2O / acetone / 24 h / 20 °C 2: 90 percent / LiAlH4 / diethyl ether / 0.5 h / -60 °C 3: 72 percent / NBS; Me2S / CH2Cl2 / 1 h / 0 °C 4: 90 percent / Jones reagent / acetone / 0.5 h 5: 70 percent / Et3N / 0.5 h / Heating View Scheme |
methyl 2,3-dideoxy-α,β-DL-glycero-pent-2-enopyranoside
pyran-2-one
Conditions | Yield |
---|---|
Multi-step reaction with 3 steps 1: 72 percent / NBS; Me2S / CH2Cl2 / 1 h / 0 °C 2: 90 percent / Jones reagent / acetone / 0.5 h 3: 70 percent / Et3N / 0.5 h / Heating View Scheme |
3-bromo-6-methoxy-3,6-dihydro-2H-pyran
pyran-2-one
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1: 90 percent / Jones reagent / acetone / 0.5 h 2: 70 percent / Et3N / 0.5 h / Heating View Scheme |
exo-10-oxatricyclo<5.2.1.02,6>deca-4,8-dien-3-one
pyran-2-one
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1: 94 percent / 33percent hydrogen peroxide, 0.2 N sodium hydroxide / methanol; CH2Cl2; H2O / 3 h 2: 1.5 h / 0.04 Torr / flash vacuum thermolysis; T1 75 deg C / T2 375 deg C View Scheme |
Conditions | Yield |
---|---|
Multi-step reaction with 4 steps 1: 6 percent / piridinium dichromate / CH2Cl2 / 2 h / 0 °C 2: 0.025 g / triethylamine / toluene / 0.5 h / 80 °C 3: NBS 4: triethylamine View Scheme | |
Multi-step reaction with 3 steps 1: 50 percent / piridinium dichromate / CH2Cl2 / 2 h / 0 °C 2: NBS 3: triethylamine View Scheme | |
Multi-step reaction with 4 steps 1: 6 percent / piridinium dichromate, t-butyl hydroperoxide / CH2Cl2 / 2 h / 0 °C 2: 0.025 g / triethylamine / toluene / 0.5 h / 80 °C 3: NBS 4: triethylamine View Scheme | |
Multi-step reaction with 3 steps 1: 50 percent / piridinium dichromate, t-butyl hydroperoxide / CH2Cl2 / 2 h / 0 °C 2: NBS 3: triethylamine View Scheme |
2-(tert.butylperoxy)-3,4-dihydropyran
pyran-2-one
Conditions | Yield |
---|---|
Multi-step reaction with 3 steps 1: 0.025 g / triethylamine / toluene / 0.5 h / 80 °C 2: NBS 3: triethylamine View Scheme |
Conditions | Yield |
---|---|
Multi-step reaction with 2 steps 1: NBS 2: triethylamine View Scheme |
pyran-2-one
5-oxabicyclo<2.2.0>hex-2-en-6-one
Conditions | Yield |
---|---|
In diethyl ether at -15℃; Inert atmosphere; Irradiation; | 100% |
In diethyl ether at -10℃; for 24h; Inert atmosphere; Irradiation; | 100 %Spectr. |
In diethyl ether at -10℃; UV-irradiation; Inert atmosphere; | |
In diethyl ether at -10℃; Inert atmosphere; Microwave irradiation; | |
In diethyl ether at -15℃; Inert atmosphere; Irradiation; |
pyran-2-one
Conditions | Yield |
---|---|
In hexane ligand was added to hexane soln. of Os-cluster in Schlenk tube, heated at 40°C for 2 h under N2; solvent was removed under reduced pressure, recrystd. from CH2Cl2/hexaneat -5°C; elem. anal.; | 99% |
N-phenyl-maleimide
pyran-2-one
N,N'-diphenylbicyclo<2.2.2>oct-7-ene-2,3,5,6-tetracarboxydiimide
Conditions | Yield |
---|---|
In decalin for 1.5h; Heating; | 98% |
pyran-2-one
5,6-dibromo-5,6-dihydro-2H-pyran-2-one
Conditions | Yield |
---|---|
Stage #1: pyran-2-one With bromine In dichloromethane at -78℃; for 5h; Inert atmosphere; Irradiation; Stage #2: In dichloromethane at -78 - 20℃; Inert atmosphere; | 97% |
With bromine In dichloromethane at -78℃; for 6h; Cooling with acetone-dry ice; Irradiation; | 97% |
With bromine Irradiation; |
Conditions | Yield |
---|---|
In 1,2-dimethoxyethane at 60℃; for 4h; Inert atmosphere; | 97% |
pyran-2-one
allyl acrylate
3-Oxo-2-oxa-bicyclo[2.2.2]oct-7-ene-6-carboxylic acid allyl ester
Conditions | Yield |
---|---|
under 14251100 Torr; for 24h; | 95% |
pyran-2-one
N,N-diallylacrylamide
3-Oxo-2-oxa-bicyclo[2.2.2]oct-7-ene-6-carboxylic acid diallylamide
Conditions | Yield |
---|---|
under 14251100 Torr; for 24h; | 95% |
Conditions | Yield |
---|---|
Stage #1: pyran-2-one With 2,2,6,6-tetramethylpiperidinylmagnesium chloride lithium chloride complex In tetrahydrofuran at -40℃; for 0.25h; Schlenk technique; Inert atmosphere; Stage #2: methanethiosulfonic acid S-methyl ester In tetrahydrofuran at -40 - 25℃; Schlenk technique; Inert atmosphere; regioselective reaction; | 95% |
pyran-2-one
2-oxa-3-oxobicyclo[2.2.0]hex-5-ene
Conditions | Yield |
---|---|
In diethyl ether at -15℃; UV-irradiation; | 95% |
pyran-2-one
3,3,4,4,7,7,8,8-octamethyl-3,4,7,8-tetrasilylcycloocta-1,5-diyne
1,1,2,2,9,9,10,10-octamethyl-1,2,9,10-tetrasila<2.2>ortocyclophane
Conditions | Yield |
---|---|
With triethylamine In toluene | 93% |
maleic anhydride
pyran-2-one
3-Oxo-2-oxabicylo<2.2.2>oct-7-en-exo-5,exo-6-dicarbonsaeureanhydrid
Conditions | Yield |
---|---|
In toluene at 55℃; under 3375270 Torr; for 12h; | 92% |
In toluene at 20 - 110℃; Diels-Alder reaction; | 79% |
In xylene at 90.5℃; Rate constant; Thermodynamic data; ΔH(excit.), ΔS(excit.); further temp.; | |
With toluene |
Conditions | Yield |
---|---|
With (+)-Yb(tfc)3 In neat (no solvent) for 72h; Product distribution; Ambient temperature; further Lewis acids, also in solvent; other benzylic vinyl ether; variation of excess of benzyl vinyl ether; | 91% |
With (+)-Yb(tfc)3 In neat (no solvent) for 72h; Ambient temperature; | 91% |
pyran-2-one
2,2-dimethylpropylidynephosphine
2-tert-Butyl-λ3-phosphinin
Conditions | Yield |
---|---|
In benzene at 120℃; under 1875.1 - 2250.2 Torr; for 48h; | 91% |
Conditions | Yield |
---|---|
for 72h; Ambient temperature; | 88% |
Conditions | Yield |
---|---|
With (+)-Yb(tfc)3 In dichloromethane under 9000720 Torr; for 72h; Ambient temperature; | 88% |
pyran-2-one
fumaryl dichloride
3-Oxo-2-oxabicyclo<2.2.2>oct-7-en-endo-5,exo-6-bis(carbonylchlorid)
Conditions | Yield |
---|---|
In toluene at 60℃; under 4125330 Torr; for 12h; | 86% |
pyran-2-one
endo-tricyclo<4.2.2.02,5>deca-3,9-diene-7,8-dicarboxylate anhydride
C28H24O6
Conditions | Yield |
---|---|
In xylene for 2h; Heating; | 86% |
pyran-2-one
4,4,5,5-tetramethyl-2-trimethylsilanylethynyl-[1,3,2]dioxaborolane
trimethyl(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)silane
Conditions | Yield |
---|---|
at 170℃; for 15h; | 86% |
In neat (no solvent) 1.5 equiv. of B compd., sealed, heated at 170°C for 17 h; | 86% |
In 1,3,5-trimethyl-benzene 1.5 equiv. of B compd., sealed, heated at 170°C for 17 h; | 64% |
In 1,3,5-trimethyl-benzene at 140°C for 48 h; | 56% |
In diphenylether 1.5 equiv. of B compd., sealed, heated at 170°C for 17 h; | 56% |
tetrafluoroboric acid diethyl ether
pyran-2-one
Conditions | Yield |
---|---|
In dichloromethane soln. of complex cooled to -80°C, addn. of B-compd. with stirring, addn. of ligand after 5 min, warmed to 0°C over the course of 2h, kept at 0°C for 1h; concd. (vac.), dropwise addn. of ether, filtered, washed (ether), dried (vac.); elem. anal.; | 86% |
Conditions | Yield |
---|---|
With iron(III)-acetylacetonate In diethyl ether at -30℃; Inert atmosphere; | 86% |
N-phenyl-maleimide
pyran-2-one
endo,endo-bis-N-phenylimide of bicyclo<2.2.2>oct-7-ene-2,3,5,6-tetracarboxylic acid
Conditions | Yield |
---|---|
In xylene at 140℃; | 85% |
pyran-2-one
1-methyl-4-(trimethylsilyl)-1H-indol-5-yl trifluoromethanesulfonate
3-methyl-3H-benzo[e]indole
Conditions | Yield |
---|---|
With cesium fluoride In acetonitrile at 100℃; for 5h; Inert atmosphere; | 85% |
With cesium fluoride In acetonitrile at 100℃; | 85% |
pyran-2-one
hept-6-en-1-ylmagnesium bromide
(-)-(R)-4-(hept-6-en-1-yl)-3,4-dihydro-2H-pyran-2-one
Conditions | Yield |
---|---|
Stage #1: hept-6-en-1-ylmagnesium bromide With copper(I) bromide dimethylsulfide complex; (R,S)-reverse-Josiphos In diethyl ether; tert-butyl methyl ether at -72℃; for 0.25h; Inert atmosphere; Schlenk technique; Stage #2: pyran-2-one In diethyl ether; tert-butyl methyl ether at -72℃; Inert atmosphere; Schlenk technique; enantioselective reaction; | 85% |
Conditions | Yield |
---|---|
at 200℃; for 2h; | 84% |
pyran-2-one
Conditions | Yield |
---|---|
With potassium carbonate In acetonitrile at 20℃; for 12h; Inert atmosphere; | 82% |
pyran-2-one
(3-methylphenyl)(6-methyl-2-pyridyl)acetylene
1-(3-methylphenyl)-2-(6-methyl-2-pyridyl)benzene
Conditions | Yield |
---|---|
With hydroquinone In 1,2-dichloro-benzene for 72h; Heating; | 80% |
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