Product Identification

Product Name

5,5-Dimethyl-1,3-cyclohexanedione

Synonyms

5,5-Dimethyl-1,3-cyclohexanedione
5,5-Dimethylcyclohexane-1,3-dione
5,5-Dimethyldihydroresorcinol
Cyclomethone
Dimedon
Dimedone

CAS

126-81-8

Formula

C8H12O2

Molecular Weight

140.18

EINECS

204-804-4

RTECS

GV0345000

RTECS Class

Other

Merck

13,3268

Beilstein/Gmelin

471489

Beilstein Reference

4-07-00-01999

Physical and Chemical Properties

Appearance

Light yellow - beige - white crystalline powder.

Solubility in water

Very soluble

Boiling Point

234

Vapor Pressure

0.06 (25 C)

pKa/pKb

5.32 (pKa)

Partition Coefficient

.15

Heat Of Vaporization

47.0 kJ/mol

Heat Of Combustion

-4380 kJ/mol

Usage

For the separation and identification of aldehydes.

First Aid Measures

Ingestion

Get medical aid. Wash mouth out with water.

Inhalation

Remove from exposure to fresh air immediately.

Skin

Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.

Eyes

Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Handling and Storage

Storage

Store in a cool, dry place. Store in a tightly closed container.

Handling

Wash thoroughly after handling. Avoid contact with eyes, skin, and clothing. Do not breathe dust, vapor, mist, or gas.

Hazards Identification

Ingestion

May cause irritation of the digestive tract. May be harmful if swallowed.

Inhalation

May cause respiratory tract irritation. May be harmful if inhaled.

Skin

May cause skin irritation. May be harmful if absorbed through the skin.

Eyes

May cause eye irritation.

EC Safety Phrase

S 22 24/25

Exposure Controls/Personal Protection

Personal Protection

Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.

Respirators

Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Poison Class

4

Fire Fighting Measures

Flash Point

85

Fire Fighting

Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.

Accidental Release Measures

Small spills/leaks

Vacuum or sweep up material and place into a suitable disposal container.

Stability and Reactivity

Disposal Code

3

Stability

No data.

Incompatibilities

Oxidizing agents.

Decomposition

Carbon monoxide, carbon dioxide.

Transport Information

HS Code

2914 29 00