3,4-Dihydro-2H-pyran
CAS Number: 110-87-2
Chemical Formula: C5H8O
Synonyms:
DIHYDROPYRAN
δ2-dihydropyran
delta(Sup2)-Dihydropyran
Appearance: Transparent liquid
MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)
3,4-Dihydro-2H-pyran CAS# 110-87-2 serves as a widely applied hydroxyl-protecting agent in organic synthesis. It functions as a key intermediate for synthetic chemistry and is used to shield diverse reactive functional groups. It can participate in polymerization reactions either alone or together with unsaturated compounds, making it useful in the polymer industry. Additionally, it is applied in preparing epoxide-fused bicyclic compounds, halogenated compounds, and allenic alcohols.
Parameters
| Melting point | -70 °C (lit.) |
| Boiling point | 86 °C (lit.) |
| density | 0.922 g/mL at 25 °C (lit.) |
| vapor density | 2.9 (vs air) |
| vapor pressure | 77.8 hPa (20 °C) |
| refractive index | n20/D 1.440(lit.) |
| Fp | 4 °F |
| storage temp. | Store below +30°C. |
| solubility | 7.7g/l |
| form | Liquid |
| color | Clear colorless to yellow |
| PH | 7 (5g/l, H2O, 20℃) |
| explosive limit | 1.1-13.8%(V) |
| Water Solubility | 20 g/L (20 ºC) |
| BRN | 103493 |
| Stability: | Volatile |
| InChIKey | BUDQDWGNQVEFAC-UHFFFAOYSA-N |
| LogP | 0.690 |
| CAS DataBase Reference | 110-87-2(CAS DataBase Reference) |
| NIST Chemistry Reference | 2H-Pyran, 3,4-dihydro-(110-87-2) |
| EPA Substance Registry System | 2H-Pyran, 3,4-dihydro- (110-87-2) |
Safety Information
| Hazard Codes | F,Xi |
| Risk Statements | 11-36/37/38-36/38-19 |
| Safety Statements | 16-26-36-37/39-33-7/9 |
| RIDADR | UN 2376 3/PG 2 |
| WGK Germany | 3 |
| RTECS | UP7700000 |
| Autoignition Temperature | 240 °C |
| Hazard Note | Highly Flammable/Irritant |
| TSCA | Yes |
| HazardClass | 3 |
| PackingGroup | II |
| HS Code | 29329995 |
| Toxicity | LD50 orally in Rabbit: > 4000 mg/kg |
Product Application of 3,4-Dihydro-2H-pyran CAS# 110-87-2
3,4-Dihydro-2H-pyran can be used as a reactant to synthesize:
– Tetrahydropyranylated product from alcohols in the presence of phenolsulfonic acid-formaldehyde resin catalyst.
– Tetrahydropyran derivatives by reacting pyrazoles in the presence of trifluoroacetic acid.
– 1,2,3,4-Tetrahydroquinoline derivatives by cation-exchange resin catalyzed Domino reaction with aromatic amines.
– Tetrahydroquinolines from aryl azides in the presence of FeCl3-NaI.
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