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927-80-0 - Ethoxyacetylene, ca 50% w/w in hexanes - Ethyl ethynyl ether - A14245 - Alfa Aesar

A14245 Ethoxyacetylene, ca 50% w/w in hexanes

Codice CAS
927-80-0
Sinonimi
Ethyl ethynyl ether

Dimensioni Prezzo ($) Quantità Disponibilità
1g 25,80
5g 78,40
25g 299,00
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Ethoxyacetylene, ca 50% w/w in hexanes

MDL
MFCD00009247
EINECS
213-164-5

Proprietà chimiche

Formula
C4H6O
Peso formula
70.09
Punto di ebollizione
55-56°
Punto di infiammabilità
-28°(-18°F)
Densità
0.718
Indice di rifrazione
1.3800
Solubilità
Slightly miscible with water.

Applicazioni

Ethoxyacetylene is used in Arens-van Dorp synthesis to prepare propargyl alcohol via reaction with ketone. In organic synthesis, it undergoes [2+2] cycloaddition reactions with ketenes to give cyclobutenone derivatives. It is also used to prepare alpha, beta-unsaturated esters from ketones by following Meyer-Schuster rearrangement.Used with N-vinylamides and triflic anhydride in a direct, three-component synthesis of pyridines. Also used to prepare α, β-unsaturated esters from ketones via a Meyer-Schuster rearrangement.

Note

Incompatible with strong oxidizing agents and strong acids.

Letteratura

Supplied in solution to reduce polymerization. Quantities offered relate to gross weight of solution.

Undergoes [2+2] cycloaddition reactions with ketenes to give cyclobutenone derivatives: J. Org. Chem., 38, 1451 (1973).

Adds to carbonyl compounds in the presence of ZnBr2: Can. J. Chem., 54, 2310 (1976).

The Grignard reagent, prepared by exchange with ethyl magnesium bromide, adds to carbonyl compounds to give carbinols which rearrange in acid to ɑß-unsaturated acids. Alternatively, partial reduction of the adduct followed by hydrolysis provides a route to ɑß-unsaturated aldehydes: J. Chem. Soc., 1823 (1949); Rec. Trav. Chim., 82, 305 (1963):

Rearrangement by BF3 etherate leads directly to the ethyl ester: Rec. Trav. Chim., 78, 664 (1959); Chem. Lett., 1129 (1981); 241, 1271 (1982). See also Chloroacetaldehyde diethyl­ acetal, L07661.

Has been used as a mild dehydrating agent in peptide synthesis: Rec. Trav. Chim., 77, 1153 (1958), and for conversion of sensitive dicarboxylic acids to their anhydrides: J. Org. Chem., 33, 3808 (1968).

Aleman, G. H. J.; Machado, R. A. R.; Gorls, H.; Baldwin, I. T.; Bolan, W. Synthesis, structural characterization and biological activity of two diastereomeric JA-Ile macrolactones. Org. Biomol. Chem. 2015, 13 (21), 5885-5893.

Henry, C.; Bolien, D.; Ibanescu, B.; Bloodworth, S.; Harrowven, D. C.; Zhang, X.; Craven, A. Generation and Trapping of Ketenes in Flow. Eur. J. Org. Chem. 2015, 2015 (7), 1491-1499.

Rischio GHS e dichiarazioni precauzionali

Dichiarazioni di rischio (UE): H225-H303-H315-H361-H373-H304

Highly flammable liquid and vapour. May be harmful if swallowed. Causes skin irritation. Suspected of damaging fertility or the unborn child. May cause damage to organs through prolonged or repeated exposure. May be fatal if swallowed and enters airways.

Dichiarazioni precauzionali: P210-P273-P280h-P281-P301+P330+P331-P315

Keep away from heat/sparks/open flames/hot surfaces. - No smoking. Avoid release to the environment. Wear protective gloves/clothing. Use personal protective equipment as required. IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. Get immediate medical advice/attention.

Altri riferimenti

Beilstein
741882
Classe di rischio
3
Gruppo di imballaggio
II
Codice tariffe armonizzato
2909.19
TSCA
No
RTECS
KN9900000

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