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536-74-3 - Phenylacetylene, 98+% - Ethynylbenzene - A12139 - Alfa Aesar

A12139 Phenylacetylene, 98+%

Codice CAS
536-74-3
Sinonimi
Ethynylbenzene

Dimensioni Prezzo ($) Quantità Disponibilità
25g 29,70
100g 92,50
500g 392,00
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Phenylacetylene, 98+%

MDL
MFCD00008570
EINECS
208-645-1

Proprietà chimiche

Formula
C8H6
Peso formula
102.14
Punto di fusione
-45°
Punto di ebollizione
142-144°
Punto di infiammabilità
27°(81°F)
Densità
0.930
Indice di rifrazione
1.5480
Sensibilità
Light Sensitive
Solubilità
Immiscible with water.

Applicazioni

Phenylacetylene is involved in the preparation of styrene by reduction using Lindlar catalyst. It is used to study the mechanism of the palladium-catalyzed phenyl acetylene oxidative carbonylation reaction. It is also used in the polymerization process to prepare polyphenylacetylene namely 1,2,4-triphenylbenzene and 1,3,5-triphenylbenzene.

Note

Store in cool place. Moisture sensitive. Keep the container tightly closed in a dry and well-ventilated place. Incompatible with acids, halogens, alkali metals and oxidizing agents.

Letteratura

Conversion to the 1-bromoalkyne has been described: Org. Synth. Coll., 5, 921 (1973). For an improved phase-transfer method, using NaBr/NaOCl, see: J. Org. Chem., 57, 4555 (1992).

For cyanation with CuCN in the presence of TMS chloride and NaI, see: Tetrahedron Lett., 34, 591 (1993).

Glaser oxidative coupling by Cu(OAc)2 in pyridine gives diphenylbuta-1,3-diyne: Org. Synth. Coll., 5, 499 (1973).

For conversion to the Grignard with ethylmagnesium bromide, and subsequent Cu-catalyzed coupling with allyl bromide, see: Org. Synth. Coll., 6, 925 (1988).

For preparation of the cuprate and references for coupling with aryl halides to give diarylacetylenes, see: Org. Synth. Coll., 6, 916 (1988).

Dimetallation can be accomplished with a 2:1 molar mixture of n-BuLi and KO-t-Bu in THF, the second metallation occurring specifically at the ortho-position. Thus, the bis(TMS)-derivative can be prepared in excellent yield: J. Org. Chem., 55, 1311 (1990).

Weerachawanasak, P.; Praserthdam, P.; Panpranot, J. Liquid-Phase Hydrogenation of Phenylacetylene Over the Nano-Sized Pd/TiO2 Catalysts. J. Nanosci. Nanotechnol. 2014, 14 (4), 3170-3175.

Yoshida, H.; Zama, T.; Fujita, S. I.; Panpranot, J.; Arai, M. Liquid phase hydrogenation of phenylacetylene over Pd and PdZn catalysts in toluene: effects of alloying and CO2 pressurization. RSC Adv. 2014, 4 (47), 24922-24928.

Rischio GHS e dichiarazioni precauzionali

Dichiarazioni di rischio (UE): H304-H226-H319-H335

May be fatal if swallowed and enters airways. Flammable liquid and vapour. Causes serious eye irritation. May cause respiratory irritation.

Dichiarazioni precauzionali: P261-P280f-P305+P351+P338-P301+P330+P331-P315

Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective clothing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. Get immediate medical advice/attention.

Altri riferimenti

Merck
14,3861
Beilstein
605461
Classe di rischio
3
Gruppo di imballaggio
III
Codice tariffe armonizzato
2902.90
TSCA
Yes
RTECS
DA0780000

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