1,2-butadiene

Structural formula
General
Surname	1,2-butadiene
other names	Buta-1,2-diene; Methylallene;
Molecular formula	C 4 H 6
Brief description	colorless, sweet-smelling gas
External identifiers / databases
EC number	209-674-2
ECHA InfoCard	100,008,796
PubChem	11535
Wikidata	Q161451
properties
Molar mass	54.09 g mol −1
Physical state	gaseous
density	0.652 kg m −3 (15 ° C)
Melting point	−136.2 ° C
boiling point	10.9 ° C
Vapor pressure	0.14 M Pa (20 ° C)
solubility	very bad in water (0.1 g l −1 at 20 ° C)
Refractive index	1.4205 (liquid, 1 ° C)
safety instructions
H and P phrases	H: 220-280
	P: 210-377-381-410 + 403-243
Thermodynamic properties
ΔH f 0	162.3 kJ / mol
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

1,2-Butadiene [ -butaˈdi̯eːn ] is an organic , doubly unsaturated chemical compound from the group of alkenes . It is an isomer of 1,3-butadiene .

Extraction and presentation

1,2-Butadiene can be obtained by vapor phase isomerization of 2-butyne over base-modified catalysts.

properties

1,2-Butadiene is an extremely flammable gas which forms explosive mixtures with air. It's heavier than air. It dissolves only poorly in water (approx. 1 g / l), but it is soluble in hydrocarbons, alcohols and ethers. Its critical temperature is 176.1 ° C, the critical pressure 43 bar, the critical density 0.247 kg / l and the triple point temperature at −136 ° C (melting temperature). It has a specific heat capacity of 1.471 kJ / (kg K) (in the gaseous state at 25 ° C) or 2.247 kJ / (kg K) (as a liquid at the boiling point. It is easily condensable under pressure.

use

1,2-Butadiene is used as an intermediate in organic synthesis.

Web links

Process for the production of 1,2-butadiene (freepatents online)

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ entry to 1,2-butadiene in the GESTIS database of IFA , retrieved on February 1, 2016(JavaScript required) .
↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Physical Constants of Organic Compounds, pp. 3-72.
↑ David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-25.
↑ LE Calihan, EL Kay, DT Roberts, LB Wakefield: Synthesis of 1,2-butadiene. Vapor phase isomerization of 2-butyne over base-modified catalysts. In: Colloid and Polymer Science. 256, 1978, p. 287, doi : 10.1007 / BF01550594 .
↑ ^a ^b 1,2-butadiene (Oxeno) ( Memento from October 26, 2004 in the Internet Archive ) (PDF; 110 kB)
↑ 1,2-butadiene (Intergas)

[gestis-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ entry to 1,2-butadiene in the GESTIS database of IFA , retrieved on February 1, 2016(JavaScript required) .

[CRC90_3_72-2] David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Physical Constants of Organic Compounds, pp. 3-72.

[CRC90_5_25-3] David R. Lide (Ed.): CRC Handbook of Chemistry and Physics . 90th edition. (Internet version: 2010), CRC Press / Taylor and Francis, Boca Raton, FL, Standard Thermodynamic Properties of Chemical Substances, pp. 5-25.

[4] LE Calihan, EL Kay, DT Roberts, LB Wakefield: Synthesis of 1,2-butadiene. Vapor phase isomerization of 2-butyne over base-modified catalysts. In: Colloid and Polymer Science. 256, 1978, p. 287, doi : 10.1007 / BF01550594 .

[oxeno-5] 1,2-butadiene (Oxeno) ( Memento from October 26, 2004 in the Internet Archive ) (PDF; 110 kB)

[6] 1,2-butadiene (Intergas)