Methylal
Title: Methylal
CAS Registry Number: 109-87-5
CAS Name: Dimethoxymethane
Additional Names: formal; formaldehyde dimethyl acetal
Molecular Formula: C3H8O2
Molecular Weight: 76.09
Percent Composition: C 47.35%, H 10.60%, O 42.05%
Line Formula: CH2(OCH3)2
Literature References: Prepn by catalytic vapor-phase oxidation of methanol in the presence of small amts of HCl; from methanol and formaldehyde: Frevel, Hedelund, US 2663742; US 2691684 (1953, 1954, both to Dow); from paraformaldehyde + methanol in the presence of CaCl2 + HCl: R. Rambaud, D. Besserre, Bull. Soc. Chim. Fr. 1955, 45.
Properties: Colorless, clear, volatile, flammable liq; chloroform odor; pungent taste. bp760 41.6°; bp754 41.5°. mp -105°. d414 0.8669; d420 0.8593. nD18 1.3589. Flash pt, closed cup: 0°F (-18°C). Sol in 3 parts water; miscible with alcohol, ether, oils.
Melting point: mp -105°
Boiling point: bp760 41.6°; bp754 41.5°
Flash point: Flash pt, closed cup: 0°F (-18°C)
Index of refraction: nD18 1.3589
Density: d414 0.8669; d420 0.8593
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin and upper respiratory system; anesthesia. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 198.
Use: In perfumery; manuf artificial resins; reaction medium for Grignard and Reppe reactions.

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