12th
Автор: chemistry with priya
Загружено: 2022-11-29
Просмотров: 253
Описание:
sandmeyer reaction
*chloroarene and bromoarene can be prepared when the diazonium salt is treated with CuCl dissolved in HCl or CuBr dissolved in HBr.
*iodoarene is simply prepared by heating diazonium salt with aqueous KI solution at 278K.
*fluroarene is prepared by heating corresponding benzene diazonium tetrafluroborate.
*benzene diazonium chloride is prepared by treating aniline with aqueous HCl dissolved in aqueous solution of sodium nitrite NANO2.
NaNO2 + HCl = HONO + NaCl
C6H5NH2 +HONO +HCl = C6H5N2Cl +H2O
*benzene diazonium tetrafluroborate is prepared by treating aniline with aqueous NaNO2 in the presence of fluroboric acid HBF4.
C6H5NH2 +HBF4 + NaNO2= C6H5N2BF4
*this reaction is known as balz schiemann reaction.
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