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CAS No.: | 4454-05-1 |
---|---|
Name: | 3,4-DIHYDRO-2-METHOXY-2H-PYRAN |
Molecular Structure: | |
Formula: | C6H10O2 |
Molecular Weight: | 114.144 |
Synonyms: | 2,3-Dihydro-2-methoxy-4H-pyran;2-Methoxy-2,3-dihydro-4H-pyran;2-Methoxy-3,4-dihydropyran;2H-2-Methoxy-3,4-dihydropyran;3,4-Dihydro-2-methoxy-2H-pyran;NSC 44974; |
EINECS: | 224-698-3 |
Density: | 0.987 g/cm3 |
Boiling Point: | 149.348 °C at 760 mmHg |
Flash Point: | 16.667 °C |
Appearance: | clear colourless to yellow liquid |
Hazard Symbols: | Xn,F |
Risk Codes: | 22-11-36-20-10 |
Safety: | 9-33-16-36-26 |
PSA: | 18.46000 |
LogP: | 1.28300 |
Conditions | Yield |
---|---|
With 2,6-di-tert-butyl-4-methyl-phenol at 135℃; under 22502.3 Torr; for 12h; Product distribution / selectivity; | 92% |
With 2,6-di-tert-butyl-4-methyl-phenol at 135℃; for 12h; Product distribution / selectivity; | 77% |
With hydroquinone | |
at 135℃; |
Conditions | Yield |
---|---|
at 135℃; | |
at 180℃; |
Conditions | Yield |
---|---|
at 180℃; |
methanol
cyclopentene
A
2-methoxy-3,4-dihydro-2H-pyran
B
methyl 4-formylbutanoate
C
methyl 5,5-dimethoxyvalerate
D
Dimethyl glutarate
E
1,1,5,5-tetramethoxy-pentane
F
Glutaraldehyde
Conditions | Yield |
---|---|
With hydrogenchloride; ozone Product distribution; Mechanism; -78 deg to r.t.; | A n/a B 2 % Chromat. C 46 % Chromat. D 23 % Chromat. E 27 % Chromat. F 1 % Chromat. G n/a |
2-methoxy-3,4-dihydro-2H-pyran
trifluoroacetic anhydride
2,2,2-trifluoro-1-(2-methoxy-3,4-dihydro-2H-5-pyranyl)-2,2,2-trifluoro-1-ethanone
Conditions | Yield |
---|---|
With pyridine In chloroform for 18h; Ambient temperature; | 100% |
With pyridine In dichloromethane at 0 - 20℃; for 16h; Inert atmosphere; | 80% |
With pyridine In chloroform at 0 - 25℃; for 16h; |
Conditions | Yield |
---|---|
With hydrogen; palladium on activated carbon at 20℃; under 6000.6 - 15001.5 Torr; for 1.5h; Product distribution / selectivity; | 96% |
Conditions | Yield |
---|---|
With sodium dihydrogenphosphate In water at 20 - 92℃; under 150.015 Torr; Temperature; Large scale; | 95.4% |
With cation-exchange resin KU-2 and KU-2-8 In water at 20 - 30℃; | 40% |
With water at 150℃; |
Conditions | Yield |
---|---|
With hydrogenchloride at -10℃; for 1.5h; | 91% |
With hydrogenchloride |
2-methoxy-3,4-dihydro-2H-pyran
allyl bromide
4,8-dihydroxy-1,10-undecanediene
Conditions | Yield |
---|---|
With tin; water at 20℃; | 89% |
Conditions | Yield |
---|---|
In benzene | 87.4% |
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The 2H-Pyran, 3, 4-dihydro-2-methoxy-, with the CAS registry number of 4454-05-1, is also known as 3, 4-Dihydro-2-methoxy-2H-pyran. Its EINECS registry number is 224-698-3. This chemical's molecular formula is C6H10O2 and molecular weight is 114.14. What's more, its IUPAC name is 2-Methoxy-3, 4-dihydro-2H-pyran. In addition, it must be stored in airtight containers and placed in a dry, ventilated place. Meanwhile, it should be avoided contact with light. This chemical's classification codes are Drug/Therapeutic Agent; Skin/Eye Irritant.
Physical properties about 2H-Pyran, 3, 4-dihydro-2-methoxy- are: (1)ACD/LogP: -0.10; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -0.1; (4)ACD/LogD (pH 7.4): -0.1; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 21.14; (8)ACD/KOC (pH 7.4): 21.14; (9)#H bond acceptors: 2; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 1; (12)Polar Surface Area: 18.46 Å2; (13)Index of Refraction: 1.451; (14)Molar Refractivity: 31.14 cm3; (15)Molar Volume: 115.6 cm3; (16)Surface Tension: 28.4 dyne/cm; (17)Density: 0.98 g/cm3; (18)Flash Point: 16.7 °C; (19)Enthalpy of Vaporization: 37.03 kJ/mol; (20)Boiling Point: 149.3 °C at 760 mmHg; (21)Vapour Pressure: 5.14 mmHg at 25 °C.
Uses: it is used to produce other chemicals. For example, it is used to produce Pentanedial. The reaction needs reagent cation-exchange resin KU-2 and KU-2-8. Meanwhile, it needs solvent H2O. The reaction temperature is 20-30 °C. The yield is about 40 %.
When you are using this chemical, please be cautious about it as the following:
As a chemical, it is irritating to eyes. In addition, this chemical is harmful if swallowed. During using it, wear suitable protective clothing, gloves and eye/face protection. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
You can still convert the following datas into molecular structure:
(1) SMILES: O(C)C1O\C=C/CC1
(2) InChI: InChI=1/C6H10O2/c1-7-6-4-2-3-5-8-6/h3,5-6H,2,4H2,1H3
(3) InChIKey: XCYWUZHUTJDTGS-UHFFFAOYAG
The toxicity data is as follows:
Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
---|---|---|---|---|---|
rabbit | LD50 | skin | 4920mg/kg (4920mg/kg) | LUNGS, THORAX, OR RESPIRATION: STRUCTURAL OR FUNCTIONAL CHANGE IN TRACHEA OR BRONCHI LUNGS, THORAX, OR RESPIRATION: DYSPNEA SKIN AND APPENDAGES (SKIN): "DERMATITIS, OTHER: AFTER SYSTEMIC EXPOSURE" | Veterinary and Human Toxicology. Vol. 30, Pg. 545, 1988. |
rat | LCLo | inhalation | 8044ppm/1H (8044ppm) | SENSE ORGANS AND SPECIAL SENSES: LACRIMATION: EYE BEHAVIORAL: ALTERED SLEEP TIME (INCLUDING CHANGE IN RIGHTING REFLEX) LUNGS, THORAX, OR RESPIRATION: PLEURAL EFFUSION | Veterinary and Human Toxicology. Vol. 30, Pg. 545, 1988. |
rat | LD50 | oral | 1410mg/kg (1410mg/kg) | SENSE ORGANS AND SPECIAL SENSES: LACRIMATION: EYE BEHAVIORAL: ALTERED SLEEP TIME (INCLUDING CHANGE IN RIGHTING REFLEX) LUNGS, THORAX, OR RESPIRATION: OTHER CHANGES | Veterinary and Human Toxicology. Vol. 30, Pg. 545, 1988. |