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Properties of substance:

dimethoxymethane

Synonyms:

methylal

Group of substances:

organic

Physical appearance:

colorless liquid

Empirical formula (Hill's system for organic substances):

C3H8O2

Structural formula as text:

CH2(OCH3)2

Molar/atomic mass: 76.094

Melting point (°C):

-104.8

Boiling point (°C):

42

CAS №: 109-87-5

Solubility (g/100 g of solvent):

acetone: very soluble [Ref.]
benzene: very soluble [Ref.]
diethyl ether: miscible [Ref.]
ethanol: miscible [Ref.]
water: 24.41 (16°C) [Ref.]
water: 23 (20°C) [Ref.]

Density:

0.872 (15°C, d4)
0.8593 (20°C, g/cm3)

Synthesis 1:

Reference: Barrowcliff M., Francis H.C. Organic Medicinal Chemicals. — London : William Clowes and Sons, 1921 pp. 15

A mixture of 2.5 parts of methyl alcohol, containing 1% of anhydrous hydrochloric acid and 1 part of paraformaldehyde, is heated under a reflux condenser at 40°–50° for six hours, and then allowed to stand overnight. The acidity is neutralised by the addition of lime and the mixture is then fractionally distilled. Methylal is a colourless volatile liquid, s.g. 0.855, B.P. 42°. It is readily soluble in water and neutral to litmus.

Refractive index (nD):

1.3513 (20°C)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-348.5 (g)

Standard molar enthalpy (heat) of formation ΔfH0 (298.15 K, kJ/mol):

-377.8 (l)

Standard molar entropy S0 (298.15 K, J/(mol·K)):

244 (l)

Molar heat capacity at constant pressure Cp (298.15 K, J/(mol·K)):

162 (l)

References:

  1. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 3-188, 5-25
  2. Dictionary of organic compounds. - Vol. 2, Eccaine - Myrtillin chloride. - London, 1946. - pp. 608
  3. Seidell A. Solubilities of organic compounds. - 3ed., vol.2. - New York: D. Van Nostrand Company, 1941. - pp. 208
  4. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 77
  5. Справочник нефтехимика. - Т.1, под ред. Огородникова С.К. - Л.: Химия, 1978. - pp. 462-463 [Russian]
  6. Справочник химика. - Т. 2. - Л.-М.: Химия, 1964. - pp. 782-783 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru