semicarbaziden.

/sɛmɪˈkɑːbəzʌɪd/

Etymology: < semi- prefix 2c(i) + carbo- comb. form + az- (in azo- comb. form) + -ide suffix.

Chemistry.

A colourless, crystalline, basic solid, NH₂·CO·NH·NH₂, derived from urea by substitution of a hydrazino group for one of the amino groups, which reacts with carbonyl compounds to form semicarbazones. Also, a derivative of this.

ΚΠ

1892 Jrnl. Chem. Soc. 62 ii. 1297 When amidoguanidine is treated with dilute acids, or with caustic alkalis, and is first converted into semicarbazide with liberation of ammonia.

1894 Jrnl. Chem. Soc. 66 i. 165 Semicarbazide may be obtained from amidoguanidine or by the action of potassium cyanate on hydrazine sulphate.

1938 G. H. Richter Textbk. Org. Chem. xiii. 224 Semicarbazide is a valuable reagent for..the Wolff-Kishner reduction of the carbonyl group.

1968 R. O. C. Norman Princ. Org. Synthesis x. 315 In order to obtain derivatives for the characterization of the carbonyl compound it is more satisfactory to use a monosubstituted hydrazine; semicarbazide, phenylhydrazine, and 2,4-dinitrophenylhydrazine are commonly chosen.

This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).

单词	semicarbazide
释义	semicarbaziden. /sɛmɪˈkɑːbəzʌɪd/ Etymology: < semi- prefix 2c(i) + carbo- comb. form + az- (in azo- comb. form) + -ide suffix. Chemistry. A colourless, crystalline, basic solid, NH₂·CO·NH·NH₂, derived from urea by substitution of a hydrazino group for one of the amino groups, which reacts with carbonyl compounds to form semicarbazones. Also, a derivative of this. ΚΠ 1892 Jrnl. Chem. Soc. 62 ii. 1297 When amidoguanidine is treated with dilute acids, or with caustic alkalis, and is first converted into semicarbazide with liberation of ammonia. 1894 Jrnl. Chem. Soc. 66 i. 165 Semicarbazide may be obtained from amidoguanidine or by the action of potassium cyanate on hydrazine sulphate. 1938 G. H. Richter Textbk. Org. Chem. xiii. 224 Semicarbazide is a valuable reagent for..the Wolff-Kishner reduction of the carbonyl group. 1968 R. O. C. Norman Princ. Org. Synthesis x. 315 In order to obtain derivatives for the characterization of the carbonyl compound it is more satisfactory to use a monosubstituted hydrazine; semicarbazide, phenylhydrazine, and 2,4-dinitrophenylhydrazine are commonly chosen. This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018). < n.1892
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