Girard reagent

Gi·​rard reagent | \ jə̇ˈrärd-\
variants: or Girard's reagent \ -​dz-​ \

Definition of Girard reagent

: any of several hydrazides that contain a quaternary ammonium radical and are useful especially in separating aldehydes or ketones (as some steroid hormones) from mixtures by forming soluble hydrazones: such as
a : a crystalline compound (CH3)3N(Cl)CH2CONHNH2 derived from trimethylamine or betaine

called also Girard T reagent

b : a crystalline compound C5H5N(Cl)CH2CONHNH2 derived from pyridine

called also Girard P reagent

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History and Etymology for Girard reagent

after André Girard, 20th century French chemist

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not constant or steady

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