| Identification | More | [Name]
Acetal | [CAS]
105-57-7 | [Synonyms]
1,1-DIETHOXYACETAL
1,1-DIETHOXYETHANE
ACETAL
ACETALDEHYDE DIETHYL ACETAL
DIETHYL ACETAL
ETHYLIDENE DIETHYL ETHER
FEMA 2002
1,1-Diaethoxy-aethan
1,1-Diethoxy-ethaan
1,1-diethoxy-ethan
1,1-Dietossietano
acetaal
acetadehydediethylacetal
acetal (acetaldehyde diethyl acetal)
Acetal diethylique
Acetal homopolymer resin
acetal(acetaldehydediethylacetal)
acetaldehydeethylacetal
acetaldiethylique
acetaldiethylique(french) | [EINECS(EC#)]
203-310-6 | [Molecular Formula]
C6H14O2 | [MDL Number]
MFCD00009243 | [Molecular Weight]
118.17 | [MOL File]
105-57-7.mol |
| Chemical Properties | Back Directory | [Description]
Acetal is a clear, colourless, and extremely flammable liquid with an agreeable odour. The
vapour is susceptible to cause flash fire. Acetal is sensitive to light and, on storage, may form
peroxides. In fact, it has been reported to be susceptible to autoxidation and should, therefore,
be classified as peroxidisable. Acetal is incompatible with strong oxidising agents and acids. | [Appearance]
Acetal, an aldehyde, is a clear, volatile liquid with an agreeable odor | [Melting point ]
-100 °C
| [Boiling point ]
103 °C | [density ]
0.831 g/mL at 25 °C(lit.)
| [vapor density ]
4.1 (vs air)
| [vapor pressure ]
20 mm Hg ( 20 °C)
| [FEMA ]
2002 | [refractive index ]
n20/D 1.379-1.383(lit.)
| [Fp ]
-6 °F
| [storage temp. ]
Refrigerator (+4°C) + Flammables area | [solubility ]
46g/l | [form ]
Liquid | [color ]
Clear colorless | [Odor]
at 1.00 % in propylene glycol. ether green nut earthy sweet vegetable | [Stability:]
Stable. Highly flammable. May form peroxides in storage. Test for peroxides before use. Vapors may form an explosive mixture with air, and may travel to source of ignition and flash back. Vapors may spread along ground and collect in low or confined areas (sewers, basements, tanks). | [explosive limit]
1.6-10.4%(V) | [Odor Type]
ethereal | [Water Solubility ]
46 g/L (25 ºC) | [JECFA Number]
941 | [Merck ]
14,38 | [BRN ]
1098310 | [Dielectric constant]
3.6（21℃） | [InChIKey]
DHKHKXVYLBGOIT-UHFFFAOYSA-N | [LogP]
0.84 | [CAS DataBase Reference]
105-57-7(CAS DataBase Reference) | [NIST Chemistry Reference]
Ethane, 1,1-diethoxy-(105-57-7) | [EPA Substance Registry System]
105-57-7(EPA Substance) |
| Hazard Information | Back Directory | [Chemical Properties]
Acetal is a clear, colorless, and extremely fl
ammable liquid with an agreeable odor. The
vapor may cause fl
ash fi
re. Acetal is sensitive to light and on storage may form peroxides.
In fact, it has been reported to be susceptible to autoxidation and should, therefore, be
classifi
ed as peroxidizable. Acetal is incompatible with strong oxidizing agents and acids. | [General Description]
A clear colorless liquid with a pleasant odor. Boiling point 103-104°C. Flash point-5°F. Density 0.831 g/cm3. Slightly soluble in water. Vapors heavier than air. Moderately toxic and narcotc in high concentrations. | [Reactivity Profile]
ACETAL(105-57-7) can react vigorously with oxidizing agents. Stable in base but readily decomposed by dilute acids. Forms heat-sensitive explosive peroxides on contact with air. Old samples have been known to explode when heated due to peroxide formation [Sax, 9th ed., 1996, p. 5]. | [Air & Water Reactions]
Highly flammable. Forms heat-sensitive explosive peroxides on contact with air. Slightly soluble in water. | [Health Hazard]
Exposures to acetal cause irritation to the eyes, skin, gastrointestinal tract, nausea, vomit-
ing, and diarrhea. In high concentrations, acetal produces narcotic effects in workers. | [Health Hazard]
May irritate the upper respiratory tract. High concentrations act as a central nervous system depressant. Symptoms of exposure include headache, dizziness, drowsiness, abdominal pain, and nausea. | [Potential Exposure]
Used as a solvent; in synthetic perfumes, such as jasmine, cosmetics, flavors; in organic synthesis. | [First aid]
If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. If this chemical contacts the skin, remove contaminated clothing and wash with soap immediately. When this chemical hasbeen swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. If this chemical has been inhaled, remove from exposure, and transfer promptly to a medical facility.
| [Shipping]
UN1088 Acetal, Hazard Class: 3; Labels: 3-Flammable liquid. UN1988 Aldehydes, flammable, toxic, n.o.s., Hazard Class: 3; Labels: 3-Flammable liquid, 6.1-Poisonous materials, Technical Name Required | [Incompatibilities]
Aldehydes are frequently involved in self-condensation or polymerization reactions. These reactions are exothermic; they are often catalyzed by acid. Aldehydes are readily oxidized to give carboxylic acids. Flammable and/or toxic gases are generated by the combination of aldehydes with azo, diazo compounds, dithiocarbamates, nitrides, and strong reducing agents. Aldehydes can react with air to give first peroxo acids, and ultimately carboxylic acids. These autoxidation reactions are activated by light, catalyzed by salts of transition metals, and are autocatalytic (catalyzed by the products of the reaction). The addition of stabilizers (antioxidants) to shipments of aldehydes retards autoxidation. Presumed to form explosive peroxides on contact with air and light. May accumulate static electrical charges, and may cause ignition of its vapors. | [Waste Disposal]
Dissolve or mix the material with a combustible solvent and burn in a chemical incinerator equipped with an afterburner and scrubber. All federal, state, and local environmental regulations must be observed. | [Occurrence]
Present.in.some.liquors.(e.g.,.sake,.whiskey.and.cognac);.also.detected.and.quantitatively.assessed.in.rums.. Found.in.apple.juice,.orange.juice,.orange.peel.oil,.bitter.orange.juice,.strawberry.fruit,.raw.radish,.Chinese.quince.fruit,.Chinese. quince.flesh,.udo.(Aralia cordata Thunb.) | [Uses]
Solvent; in synthetic perfumes such as jasmine; in organic syntheses. | [Definition]
A type of organic compound
formed by addition of an alcohol to
an aldehyde. Addition of one alcohol molecule
gives a hemiacetal. Further addition
yields the full acetal. Similar reactions
occur with ketones to produce hemiketals
and ketals. | [Aroma threshold values]
Detection:.4.to.42.ppb | [Fire Hazard]
Highly flammable; flash point (closed cup)
-21°C (-6°F); vapor density 4.1 (air =
1), vapor heavier than air and can travel
some distance to a source of ignition and
flash back; autoignition temperature 230°C
(446°F); vapor forms explosive mixtures
with air, LEL and UEL values are 1.6% and
10.4% by volume in air, respectively (DOT
Label: Flammable Liquid, UN 1088).
. | [Flammability and Explosibility]
Flammable | [Industrial uses]
Acetal homopolymer resins have high tensilestrength, stiffness, resilience, fatigue endurance,and moderate toughness under repeatedimpact. Some tough grades can deliver up to 7times greater toughness than unmodified acetalin Izod impact tests and up to 30 times greatertoughness as measured by Gardner impact tests.
Automotive applications of acetal homopolymerresins include fuel-system and seat-beltcomponents, steering columns, window-supportbrackets, and handles. Typical plumbingapplications that have replaced brass or zinccomponents are showerheads, ball cocks, faucetcartridges, and various fittings. Consumer itemsinclude quality toys, garden sprayers, stereocassette parts, butane lighter bodies, zippers,and telephone components. Industrial applicationsof acetal homopolymer include couplings,pump impellers, conveyor plates, gears, sprockets,and springs. | [Metabolism]
When acetal was fed at a level of 5% in the diet for 6 days, availability of energy was 64% in chicks and 29% in rats (Yoshida et al. 1970 & 1971). Acetal is rapidly hydrolysed in the stomach(Knoefel, 1934). The resulting acetaldehyde is readily oxidized to acetic acid and eventually to carbon dioxide and water(Williams, 1959). | [Purification Methods]
Dry acetal over Na to remove alcohols and H2O, and to polymerise aldehydes, then fractionally distil. Or, treat it with alkaline H2O2 at 40-45o to remove aldehydes, then saturate with NaCl, separate, dry with K2CO3 and distil it from Na [Vogel J Chem Soc 616 1948]. [Beilstein 1 IV 3103.] |
| Questions And Answer | Back Directory | [Synthesis]
It can be synthesised by the following steps:A mixture of ketone 236 (50 g, 0.19 mol), 2,2-dimethyl-1,3- propanediol (22.08 g, 0.21 mol) and PPTS (4.85 g, 0.019 mol) was refluxed in benzene in a round bottom flask fitted with Dean-Stark apparatus for 7 hours to remove water. The reaction mixture was washed with aq. NaHCO3 solution, and then thoroughly with water, dried over anhydrous Na2SO4 and filtered. Evaporation of the solvent under reduced pressure followed by crystallization from EtOAc furnished a colourless solid (67.27 g, 95%). | [Description]
Acetal (full name: Acetaldehyde diethyl acetal/1,1-Diethoxyethane) is a major flavoring component of distilled beverages, especially malt whisky and sherry.
Acetaldehyde diethyl acetal is used as a flavoring agent to provide fruit, nut, rum, and whiskey flavors. It can react with diketene to form ethyl 5-ethoxy-3-oxohexanoate in the presence of titanium chloride. It can also be used to synthesize mixed acetal glycosides via transacetalation.
| [As a flavor ingredient]
Identification:
CAS.No.:
105-57-7
FL.No.:
6.001
FEMA.No.:
2002
NAS.No.:
2002
CoE.No.:
35
EINECS.No.:
203-310-6
JECFA.No.:
941
| [Synthesis]
Acetaldehyde diethyl acetal can be obtained by the reaction between ethyl alcohol and acetaldehyde in the presence of anhydrous calcium chloride.
| [Preparation]
To a pressure bottle containing 20 gm (0.18 mole) of anhydrous calcium chloride is added 105 gm of 95% (2.17 moles) ethanol and the mixture cooled to 8°C. Then 50 gm (1.14 moles) of cold acetaldehyde is slowly poured down the wall of the bottle. The bottle is closed and shaken vigorously for 5-10 min, with cooling if necessary. The mixture is allowed to stand at room temperature with intermittent shaking for 24 hr. The upper layer, which has separated, weighs 128-129 gm. It is washed three times with 30-40 ml of water. The organic layer is dried over 3 gm of anhydrous potassium carbonate and distilled through a 1 ft column, to afford 70-72 gm (59-60%), b.p. 101-103.5°C. The low-boiling fractions are washed again with water, dried and again fractionally distilled to give another 9.0-9.5 gm (7.9-8.1%), b.p. 101-103.5°C. Therefore, the total yield amounts to 79-81.5 gm (67-69%).
| [References]
- Maarse, H. (1991). Volatile Compounds in Foods and Beverages. CRC Press. p. 553. ISBN 0-8247-8390-5.
- Zea, Luis; Serratosa, María P.; Mérida, Julieta; Moyano, Lourdes (2015). "Acetaldehyde as Key Compound for the Authenticity of Sherry Wines: A Study Covering 5 Decades". Comprehensive Reviews in Food Science and Food Safety. 14 (6): 681–693.
|
| Safety Data | Back Directory | [Hazard Codes ]
F,Xi | [Risk Statements ]
R11:Highly Flammable.
R36/38:Irritating to eyes and skin . | [Safety Statements ]
S9:Keep container in a well-ventilated place .
S16:Keep away from sources of ignition-No smoking .
S33:Take precautionary measures against static discharges . | [RIDADR ]
UN 1088 3/PG 2
| [WGK Germany ]
2
| [RTECS ]
AB2800000
| [Autoignition Temperature]
446 °F &_& 446 °F | [TSCA ]
Yes | [HazardClass ]
3 | [PackingGroup ]
II | [HS Code ]
29110000 | [Safety Profile]
Moderately toxic by ingestion, inhalation, and intraperitoneal routes.A skin and eye irritant. A narcotic. Dangerous fire hazard when exposed to heat or flame; can react vigorously with oxidizing materials. Forms heat-sensitive explosive peroxides on contact with air. when heated to decomposition it emits acrid smoke and fumes. See also ETHERS and ALDEHYDES. | [Hazardous Substances Data]
105-57-7(Hazardous Substances Data) | [Toxicity]
LD50 orally in rats: 4.57 g/kg (Smyth) |
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