semicarbazonen.

/sɛmɪˈkɑːbəzəʊn/

Etymology: < semicarbazide n. + -one suffix.

Chemistry.

Any of a class of (usually crystalline) compounds of general formula RR′C:N·NH·CO·NH₂ which are prepared by the condensation of semicarbazide with carbonyl compounds, in order to characterize the parent carbonyl or to protect the carbonyl group in synthesis.

ΚΠ

1896 Jrnl. Chem. Soc. 70 i. 343 Mesityl oxide semicarbazone melts at 156°.

1900 Jrnl. Chem. Soc. 16 64 This formation of azines by the decomposition of semicarbazones seems also to take place in aqueous solution.

1938 G. H. Richter Textbk. Org. Chem. vii. 102 The semicarbazones may be converted into hydrazones by the action of sodium ethylate.

1973 H. J. E. Loewenthal in J. F. W. McOmie Protective Groups in Org. Chem. ix. 340 In general, and in the steroid field in particular, ease of semicarbazone formation from different types of carbonyl groups follows the order observed with other protecting groups.

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

单词	semicarbazone
释义	semicarbazonen. /sɛmɪˈkɑːbəzəʊn/ Etymology: < semicarbazide n. + -one suffix. Chemistry. Any of a class of (usually crystalline) compounds of general formula RR′C:N·NH·CO·NH₂ which are prepared by the condensation of semicarbazide with carbonyl compounds, in order to characterize the parent carbonyl or to protect the carbonyl group in synthesis. ΚΠ 1896 Jrnl. Chem. Soc. 70 i. 343 Mesityl oxide semicarbazone melts at 156°. 1900 Jrnl. Chem. Soc. 16 64 This formation of azines by the decomposition of semicarbazones seems also to take place in aqueous solution. 1938 G. H. Richter Textbk. Org. Chem. vii. 102 The semicarbazones may be converted into hydrazones by the action of sodium ethylate. 1973 H. J. E. Loewenthal in J. F. W. McOmie Protective Groups in Org. Chem. ix. 340 In general, and in the steroid field in particular, ease of semicarbazone formation from different types of carbonyl groups follows the order observed with other protecting groups. This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018). < n.1896
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