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[mass noun] A poisonous, reactive yellow gas used as a methylating agent in chemical synthesis.
- ‘Samples were evaporated to dryness under vacuum, redissolved in 20 mm of methanol, then diazomethane added to methylate ABA.’
- ‘Lipids were extracted according to the method of Bligh and Dyer, followed by methylation with ethereal diazomethane.’
- ‘Caution: the reaction sequence should be carried out behind a blast shield and in the hood because diazomethane is a vapor.’
- ‘With diazomethane itself, you can watch its color disappear and know that something's happening.’
- ‘The sap samples were thawed and an internal standard of [H 6] ABA was added before they were dried, methylated with ethereal diazomethane, dried and redissolved in methanol for analysis by gc/ms.’
Late 19th century: from diazo- (indicating the presence of two nitrogen atoms) + methane.
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