1
Question
Write short notes:
(i) Setzef Law
(ii) Sandmeyer Reaction.
(i) Setzef Law
(ii) Sandmeyer Reaction.
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Solution
(i) Saytzeff Law:
During dehydrohalogenation, more substituted alkene is the major product. In other words, the prefered product is the alkene with greater number of alkyl groups attached to C=C double bond.
CH3−CH2−CHCl−CH3 2-chlorobutane +KOH(alc)Δ−→CH3−CH=CH−CH3 2- butene (major product) +CH3−CH2−CH=CH2 1- butene (minor product) +KCl+H2O
(ii) Sandmeyer Reaction.
The nitrogen of benzene diazonium chloride is replaced with −Cl,−Br or -CN in presence of copper(I) salts.
C6H5−N+2Cl−CuX/HX−−−−−−→C6H5−X+N2↑
X=Cl,Br or CN.
During dehydrohalogenation, more substituted alkene is the major product. In other words, the prefered product is the alkene with greater number of alkyl groups attached to C=C double bond.
CH3−CH2−CHCl−CH3 2-chlorobutane +KOH(alc)Δ−→CH3−CH=CH−CH3 2- butene (major product) +CH3−CH2−CH=CH2 1- butene (minor product) +KCl+H2O
(ii) Sandmeyer Reaction.
The nitrogen of benzene diazonium chloride is replaced with −Cl,−Br or -CN in presence of copper(I) salts.
C6H5−N+2Cl−CuX/HX−−−−−−→C6H5−X+N2↑
X=Cl,Br or CN.
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