1,2-pentadiene

Structural formula
General
Surname	1,2-pentadiene
other names	Ethylallene
Molecular formula	C 5 H 8
Brief description	colorless liquid
External identifiers / databases
CAS number 591-95-7 EC number 209-737-4 ECHA InfoCard 100,008,854 PubChem 11588 Wikidata Q19885531
properties
Molar mass	68.12 g mol −1
Physical state	liquid
density	0.7 g cm −3
Melting point	−137 ° C
boiling point	45 ° C
solubility	miscible with ethanol and acetone
Refractive index	1.4170–1.4210 (at 20 ° C)
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 225 P: 210-233-241-242-243-280-303 + 361 + 353-403 + 235-501
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-pentadiene is a chemical compound from the group of unsaturated aliphatic hydrocarbons .

Extraction and presentation

1,2-Pentadiene can be obtained by reacting 1-pentyne or 2-pentyne with potassium hydroxide at 175 ° C.

properties

1,2-pentadiene is a colorless clear liquid.

Individual evidence

1. ↑ ^{a b c d e f g h} Entry on 1,2-pentadiene at TCI Europe, accessed on April 29, 2015.
2. ^ ^{A b} William M. Haynes: CRC Handbook of Chemistry and Physics, 93rd Edition . CRC Press, 2012, ISBN 978-1-4398-8049-4 , pp. 3–436 ( limited preview in Google Book search).
3. ↑ A. Stephen, K. Hashmi: Synthesis of Allenes by Isomerization Reactions, page 6 , Modern Allene Chemistry. Edited by N. Krause and ASK Hashmi, WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 2004, ISBN 3-527-30671-4 .