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Properties of substance:

methylacetylene

Synonyms:

propyne

Group of substances:

organic

Physical appearance:

gas

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

C3H4

Structural formula as text:

CH3CCH

Molar/atomic mass: 40.06

Melting point (°C):

-104.7

Boiling point (°C):

-23.23

Solubility (g/100 g of solvent):

benzene: soluble [Ref.]
chloroform: soluble [Ref.]
diethyl ether: very soluble [Ref.]
ethanol: soluble [Ref.]
oxygen liquid: 0.00029 (-183°C) [Ref.]
water: 0.364 (25°C) [Ref.]

Numerical data:

Ionization Potentials (Electronvolts): 10.37
Interatomic distances (in pm): 145.9
Interatomic distances (in pm): 105.6
Interatomic distances (in pm): 110.5
Interatomic distances (in pm): 120.6
Bond angles (in degrees): 110.2

Density:

0.69 (-40°C, d4)

Reactions of synthesis:

  1. Yeild 80-85%. [Ref.1aster]
    2HC≡CNa + (CH3)2SO4 → 2HC≡CCH3 + Na2SO4
  2. Yeild 65%. [Ref.1aster]
    HC≡CNa + (CH3)2SO4 → HC≡CCH3 + CH3OSO3Na
  3. Yeild 85%. [Ref.1aster]
    CH3CHBrCH2Br + 2KOH → HC≡CCH3 + 2H2O + 2KBr
  4. [Ref.1aster]
    CH3CHBrCH2Br + 2C2H5ONa → HC≡CCH3 + 2C2H5OH + 2NaBr

Reactions:

  1. [Ref.1]
    CH3C≡CH + CH3COOH → CH3COOC(CH3)=CH2

Vapour pressure (Torr):

7.5 (-94°C)
75 (-65.3°C)
750 (-23.2°C)

Permittivity (dielectric constant):

3.218 (-27.2°C)

Dipole moment (D):

0.784 (20°C)

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

185.4 (g)

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

248.2 (g)

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

60.7 (g)

Critical temperature (°C):

129.2

Critical pressure (MPa):

5.63

Critical volume (cm3/mol):

163.5

References:

  1. Binneweis M., Milke E. Thermochemical Data of Elements and Compounds. - 2ed, 2002. - pp. 266
  2. CRC Handbook of Chemistry and Physics. - 90ed. - CRC Press, 2010. - pp. 3-446, 5-23, 5-89, 6-67, 6-80, 6-151, 9-43, 9-58, 10-214, 16-15, 16-40
  3. Yalkowsky S.H., Yan H. Handbook of aqueous solubility data. - CRC Press, 2003. - pp. 48
  4. Yalkowsky S.H., Yan H., Jain P. Handbook of aqueous solubility data. – 2nd ed. - CRC Press, 2010. - pp. 47
  5. Рабинович В.А., Хавин З.Я. Краткий химический справочник. - Л.: Химия, 1977. - pp. 122 [Russian]
  6. Химическая энциклопедия. - Т. 3. - М.: Советская энциклопедия, 1992. - pp. 58 [Russian]
  7. Химия ацетиленовых соединений. - под ред Вийе Г.Г. - М.: Химия, 1973. - pp. 34 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru