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EINECS 203-810-4
CAS No. 110-87-2 Density 0.922 g/mL at 25 °C(lit.)
Solubility 20 g/L (20 °C) in water Melting Point -70 °C(lit.)
Formula C5H8O Boiling Point 86.5 °C at 760 mmHg
Molecular Weight 84.13 Flash Point 4°F
Transport Information UN 2376 3/PG 2 Appearance Colorless liquid
Safety 16-26-36-37/39-33-7/9 Risk Codes 11-36/37/38-36/38-19
Molecular Structure Molecular Structure of 110-87-2 (Dihydropyran) Hazard Symbols FlammableF,IrritantXi

1,2-Pyran,3,4-dihydro- (3CI);2-Pyran, 3,4-dihydro- (4CI);Pyran, dihydro- (7CI);2,3-Dihydro-4H-pyran;2,3-Dihydro-g-pyran;2H-3,4-Dihydropyran;3,4-Dihydro-2H-pyran;5,6-Dihydro-4H-pyran;


Dihydropyran Production

 Dihydropyran is prepared by the dehydration of tetrahydrofurfuryl alcohol over alumina at 300-400 °C.

Dihydropyran Consensus Reports

Reported in EPA TSCA Inventory.

Dihydropyran Specification

The Dihydropyran, with the CAS registry number 110-87-2,is also known as 3,4-Dihydro-2H-pyran; 2,3-Dihydro-4H-pyran ; 5,6-Dihydro-4H-pyran ; DHP. It belongs to the product categories of Protecting and Derivatizing Reagents;Protection and Derivatization. This chemical's molecular formula is  C5H8O and molecular weight is 84.12.Its EINECS number is 203-810-4. What's more,Its systematic name is 3,4-Dihydro-2H-pyran. It is a colorless to light yellow liqui which is used to protect alcohols in organic synthesis.

Physical properties about Dihydropyran are:
(1)ACD/LogP:  0.469; (2)# of Rule of 5 Violations:  0; (3)ACD/LogD (pH 5.5):  0.47; (4)ACD/LogD (pH 7.4):  0.47; (5)ACD/BCF (pH 5.5):  1.34; (6)ACD/BCF (pH 7.4):  1.34; (7)ACD/KOC (pH 5.5):  42.88; (8)ACD/KOC (pH 7.4):  42.88; (9)#H bond acceptors:  1; (10)#H bond donors:  0; (11)#Freely Rotating Bonds:  0; (12)Index of Refraction:  1.447; (13)Molar Refractivity:  24.268 cm3; (14)Molar Volume:  90.791 cm3; (15)Surface Tension:  32.1580009460449 dyne/cm; (16)Density:  0.927 g/cm3; (17)Flash Point:  -15.556 °C; (18)Enthalpy of Vaporization:  31.322 kJ/mol; (19)Boiling Point:  86.499 °C at 760 mmHg; (20)Vapour Pressure:  74.4069976806641 mmHg at 25°C.

You can still convert the following datas into molecular structure:
(2)Std. InChI:InChI=1S/C5H8O/c1-2-4-6-5-3-1/h2,4H,1,3,5H2;

Preparation of Dihydropyran:
Dihydropyran is prepared by the dehydration of tetrahydrofurfuryl alcohol over alumina at 300-400 °C.

Safety Information of Dihydropyran:
The Dihydropyran is irritating to eyes, respiratory system and skin. It is highly flammable,so keep away from sources of ignition. it may form explosive peroxides. Keep container tightly closed. And keep container in a well-ventilated place.Take precautionary measures against static discharges. When you use it ,wear suitable protective clothing, suitable gloves and eye/face protection. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

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