2-Formyl-3,4-dihydro-2H-pyran Chemical Properties

Melting point:

-99.9°C

Boiling point:

146 °C(lit.)

Density 

1.08 g/mL at 25 °C

refractive index 

n20/D 1.466(lit.)

Flash point:

54 °C

LogP

-0.388 (est)

CAS DataBase Reference

100-73-2(CAS DataBase Reference)

NIST Chemistry Reference

Acrolein dimer(100-73-2)

EPA Substance Registry System

2H-Pyran-2-carboxaldehyde, 3,4-dihydro- (100-73-2)

Safety Information

Hazard Codes 

Xn

Risk Statements 

10-20/21/22-36/37/38-41

Safety Statements 

16-26-33-36/37/39-45

RIDADR 

UN 2607

RTECS 

UP6825000

HazardClass 

3.2

PackingGroup 

III

MSDS

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2-Formyl-3,4-dihydro-2H-pyran Usage And Synthesis

Chemical Properties

Colorless viscous liquid

Uses

NSC 95413 is used as a reagent in chemical processes.

Synthesis Reference(s)

Journal of the American Chemical Society, 92, p. 3126, 1970 DOI: 10.1021/ja00713a034

General Description

A colorless or yellow liquid with a pungent disagreeable odor. Flash point 118°F. Density 1.077 g / cm3 (8.96 lb / gal). May be irritating to the eyes and mucous membranes; long-term exposure may result in adverse health effects. Vapors denser than air. Used to make other chemicals, plastics.

Air & Water Reactions

Flammable. Soluble in water.

Reactivity Profile

Aldehydes are frequently involved in self-condensation or polymerization reactions. These reactions are exothermic; they are often catalyzed by acid. Aldehydes are readily oxidized to give carboxylic acids. Flammable and/or toxic gases are generated by the combination of aldehydes with azo, diazo compounds, dithiocarbamates, nitrides, and strong reducing agents. Aldehydes can react with air to give first peroxo acids, and ultimately carboxylic acids. These autoxidation reactions are activated by light, catalyzed by salts of transition metals, and are autocatalytic (catalyzed by the products of the reaction). The addition of stabilizers (antioxidants) to shipments of aldehydes retards autoxidation.

Health Hazard

May cause toxic effects if inhaled or absorbed through skin. Inhalation or contact with material may irritate or burn skin and eyes. Fire will produce irritating, corrosive and/or toxic gases. Vapors may cause dizziness or suffocation. Runoff from fire control or dilution water may cause pollution.

Fire Hazard

HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames. Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers. May polymerize explosively when heated or involved in a fire. Runoff to sewer may create fire or explosion hazard. Containers may explode when heated. Many liquids are lighter than water.

Safety Profile

Mildly toxic by ingestion. A skin and severe eye irritant. A flammable liquid when exposed to heat, flame, or powerful oxidizing agents. To fight fire, use alcohol foam and multipurpose dry chemical. When heated to decomposition it emits acrid smoke and fumes

2-Formyl-3,4-dihydro-2H-pyran(100-73-2)Related Product Information

• 3,4-Dihydro-2H-pyran
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• TRIETHYLENE GLYCOL MONOMETHYL ETHER
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• Formyl radical