acetaln.

Brit.

/ˈasᵻtal/, U.S.

/ˈæsədl/,

/ˈæsəˌtæl/

Origin: A borrowing from German. Etymon: German Acetal.

Etymology: < German Acetal (J. Liebig 1833, in Ann. der Pharm. 5 30) < classical Latin acētum acetum n. + German -al -al suffix².

Chemistry.

1. A colourless volatile liquid, prepared by the reaction of acetaldehyde with ethanol, and used as a solvent and in the manufacture of perfumes.Systematic name: 1,1-diethoxyethane; CH₃CH(OC₂H₅)₂.

ΘΚΠ

the world > matter > chemistry > organic chemistry > aldehydes or alkanals > [noun] > aldehyde derivatives

acetal1838

hydramide1865

phenylhydrazone1888

hemi-acetal1893

formal1900

1838 T. Thomson Chem. Org. Bodies 306 To distinguish acetal from acetic ether and other etherial liquids.

1853 A. Ure Dict. Arts (ed. 4) I. 1 Acetal, is the subacetate of ether, having for its chemical symbol 3AcO + AcO₃. It is a light colourless ethereous liquid.

1866 H. E. Roscoe Lessons Elem. Chem. xxxii. 287 Acetal is isomeric with diethyl glycol.

1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) v. 135 Acetal, CH₃·CH(OC₂H₅)₂, boils at 104°.

1950 Jrnl. Parasitol. 36 153 Partial effectiveness at this concentration was obtained with acetal which killed 11.5 per cent of the snails.

2007 H. Ziegler Flavourings (ed. 2) v. 454 The formation of acetal is reversible. With an acid pH value ethanol and aldehyde are released.

2. Any of a class of organic compounds, typified by acetal (sense 1), which have one hydrogen atom and two alkoxy groups attached to the same carbon atom, and are prepared by reaction of aldehydes with alcohols. Cf. ketal n. at keto- comb. form 1a.Acetals have the general formula RCH(OR′)₂, where R and R′ represent alkyl groups.Ketals, formed by reaction of ketones with alcohols and having the general formula RCR′(OR″)₂, are sometimes included as a subset of acetals.hemi-acetal, polyvinyl acetal: see the first element.

ΚΠ

1871 Jrnl. Chem. Soc. 24 514 If indeed by the action of sodium ethylate on the residue..a mixture of chlorinated acetals be prepared.

1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) v. 131 The compounds obtained from alcohols, the so-called ‘acetals’,..are also formed by the partial oxidation of primary alcohols.

1945 Science 16 Nov. 506/2 The original carbonyl group has been converted to a dimethyl acetal.

1992 C. A. Smith & E. J. Wood Biosynthesis i. 25 (in figure) A glycoside link is an acetal or a ketal formed between an alcohol and an aldehyde or ketone.

3. = polyoxymethylene n. at poly- comb. form 2. Frequently attributive.

ΚΠ

1948 P. O. Powers in H. H. Uhlig Corrosion Handbk. 896 Vinyl acetate polymerizes readily to a rather soft resin which is little used in protective finishes. However, if the acetate groups are removed by hydrolysis and most of the free hydroxyl groups then condensed with an aldehyde, a series of ‘acetal’ resins is formed which have wide applications in surface coatings.

1986 Early Music 14 419/3 (advt.) A harpsichord jack... Made in low friction acetal (similar to Delrin).

2000 Model Railroader Feb. 17/1 The..assemblies, made from acetal plastic, snap together easily.

This entry has been updated (OED Third Edition, September 2009; most recently modified version published online December 2021).

单词	acetal
释义	acetaln. Brit. /ˈasᵻtal/, U.S. /ˈæsədl/, /ˈæsəˌtæl/ Origin: A borrowing from German. Etymon: German Acetal. Etymology: < German Acetal (J. Liebig 1833, in Ann. der Pharm. 5 30) < classical Latin acētum acetum n. + German -al -al suffix². Chemistry. 1. A colourless volatile liquid, prepared by the reaction of acetaldehyde with ethanol, and used as a solvent and in the manufacture of perfumes.Systematic name: 1,1-diethoxyethane; CH₃CH(OC₂H₅)₂. ΘΚΠ the world > matter > chemistry > organic chemistry > aldehydes or alkanals > [noun] > aldehyde derivatives acetal1838 hydramide1865 phenylhydrazone1888 hemi-acetal1893 formal1900 1838 T. Thomson Chem. Org. Bodies 306 To distinguish acetal from acetic ether and other etherial liquids. 1853 A. Ure Dict. Arts (ed. 4) I. 1 Acetal, is the subacetate of ether, having for its chemical symbol 3AcO + AcO₃. It is a light colourless ethereous liquid. 1866 H. E. Roscoe Lessons Elem. Chem. xxxii. 287 Acetal is isomeric with diethyl glycol. 1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) v. 135 Acetal, CH₃·CH(OC₂H₅)₂, boils at 104°. 1950 Jrnl. Parasitol. 36 153 Partial effectiveness at this concentration was obtained with acetal which killed 11.5 per cent of the snails. 2007 H. Ziegler Flavourings (ed. 2) v. 454 The formation of acetal is reversible. With an acid pH value ethanol and aldehyde are released. 2. Any of a class of organic compounds, typified by acetal (sense 1), which have one hydrogen atom and two alkoxy groups attached to the same carbon atom, and are prepared by reaction of aldehydes with alcohols. Cf. ketal n. at keto- comb. form 1a.Acetals have the general formula RCH(OR′)₂, where R and R′ represent alkyl groups.Ketals, formed by reaction of ketones with alcohols and having the general formula RCR′(OR″)₂, are sometimes included as a subset of acetals.hemi-acetal, polyvinyl acetal: see the first element. ΚΠ 1871 Jrnl. Chem. Soc. 24 514 If indeed by the action of sodium ethylate on the residue..a mixture of chlorinated acetals be prepared. 1922 J. J. Sudborough Bernthsen's Text-bk. Org. Chem. (new ed.) v. 131 The compounds obtained from alcohols, the so-called ‘acetals’,..are also formed by the partial oxidation of primary alcohols. 1945 Science 16 Nov. 506/2 The original carbonyl group has been converted to a dimethyl acetal. 1992 C. A. Smith & E. J. Wood Biosynthesis i. 25 (in figure) A glycoside link is an acetal or a ketal formed between an alcohol and an aldehyde or ketone. 3. = polyoxymethylene n. at poly- comb. form 2. Frequently attributive. ΚΠ 1948 P. O. Powers in H. H. Uhlig Corrosion Handbk. 896 Vinyl acetate polymerizes readily to a rather soft resin which is little used in protective finishes. However, if the acetate groups are removed by hydrolysis and most of the free hydroxyl groups then condensed with an aldehyde, a series of ‘acetal’ resins is formed which have wide applications in surface coatings. 1986 Early Music 14 419/3 (advt.) A harpsichord jack... Made in low friction acetal (similar to Delrin). 2000 Model Railroader Feb. 17/1 The..assemblies, made from acetal plastic, snap together easily. This entry has been updated (OED Third Edition, September 2009; most recently modified version published online December 2021). < n.1838
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