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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

Numéro CAS
927-80-0
Synonymes
Ethyl ethynyl ether

Dimensions Prix ($) Quantité Disponibilité
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

Propriétés chimiques

Formule
C4H6O
Poids formulaire
70.09
Point d'ébullition
55-56°
Point d'éclair
-28°(-18°F)
Densité
0.718
Indice de réfraction
1.3800
Solubilité
Slightly miscible with water.

Applications

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.

Notes

Incompatible with strong oxidizing agents and strong acids.

Références bibliographiques

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.

Mentions de danger et de prudence du SGH

Mentions de danger (UE): H225-H304-H361-H373-H315-H303-H401-H411

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

Mentions de prudence: P210-P273-P280h-P281-P243-P301+P330+P331-P315-P403+P235

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. Take precautionary measures against static discharge. IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. Get immediate medical advice/attention. Store in a well-ventilated place. Keep cool.

Autres références

Beilstein
741882
Classe de danger
3
Groupe d'emballage
II
Code tarifaire harmonisé
2909.19
TSCA
No
RTECS
KN9900000

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