英语词汇“ketal”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

ketal n.

Brit.

/ˈkiːtal/

U.S.

/ˈkiˌtæl/

[after acetal n.] any compound of the type R¹R²C(OR³)OR⁴, where neither R¹ nor R² is a hydrogen atom (see quot. 1926).

ΚΠ

1924 Chem. Abstr. 18 3518 (heading) Velocity of hydrolysis of acetals and ketals.

1926 Chem. Abstr. 20 2937 The saponification of ketals (acetals of ketones) was studied in the presence of mineral acid catalyzers. They are liquids of disagreeable odor, insol. in water, sol. in alc., ether, etc., stable towards dil. alkali, rapidly hydrolyzed by dil. acid.

1933 Jrnl. Amer. Chem. Soc. 55 3744 The method described in this paper..furnishes a simple approach to cyclic ketals which are difficult or impossible to make by the usual method.

1965 Nomencl. Org. Chem. (I.U.P.A.C.) C. 104 Compounds containing the group ^_C^OR¹_OR² are termed acetals. [Note] The name ‘ketal’ is abandoned.

1967 I. L. Finar Org. Chem. (ed. 5) I. viii. 189 Ketones do not readily form ketals when treated with alcohols in the presence of hydrogen chloride... Ketals may, however, be prepared by treating the ketone with ethyl orthoformate.

单词	ketal
释义	> as lemmas ketal ketal n. Brit. /ˈkiːtal/ , U.S. /ˈkiˌtæl/ [after acetal n.] any compound of the type R¹R²C(OR³)OR⁴, where neither R¹ nor R² is a hydrogen atom (see quot. 1926). ΚΠ 1924 Chem. Abstr. 18 3518 (heading) Velocity of hydrolysis of acetals and ketals. 1926 Chem. Abstr. 20 2937 The saponification of ketals (acetals of ketones) was studied in the presence of mineral acid catalyzers. They are liquids of disagreeable odor, insol. in water, sol. in alc., ether, etc., stable towards dil. alkali, rapidly hydrolyzed by dil. acid. 1933 Jrnl. Amer. Chem. Soc. 55 3744 The method described in this paper..furnishes a simple approach to cyclic ketals which are difficult or impossible to make by the usual method. 1965 Nomencl. Org. Chem. (I.U.P.A.C.) C. 104 Compounds containing the group ^_C^OR¹_OR² are termed acetals. [Note] The name ‘ketal’ is abandoned. 1967 I. L. Finar Org. Chem. (ed. 5) I. viii. 189 Ketones do not readily form ketals when treated with alcohols in the presence of hydrogen chloride... Ketals may, however, be prepared by treating the ketone with ethyl orthoformate. extracted from keto-comb. form < as lemmas
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> as lemmas