Among the following which one does not act as an intermediate in Hofmann rearrangement

Question

Among the following which one does not act as an intermediate in Hofmann rearrangement (A) RNCO (B) R C O ddotN (C) R C O ddotN H B r (D) RNC

Tardigrade Admin · Accepted Answer

R overset underset||OC N H2+B r2+K O H longrightarrow R C O N H B r+K B r+H2 O R C O N H B r+K O H longrightarrow R N C O+K B r+H2 O R N C O+2 K O H longrightarrow R N H2+K2 C O3 R C O N H2+B r2+4 K O H longrightarrow R N H2+2 K B r+K2 C O3+2 H2 O

Q. Among the following which one does not act as an intermediate in Hofmann rearrangement

$RNCO$

$RCO \ddot{N}$

$RCO \ddot{N} H B r$

$RNC$

$R C ∣∣ O N H_{2} + B r_{2} + K O H ⟶ RCON H B r + K B r + H_{2} O$
$RCON H B r + K O H ⟶ RNCO + K B r + H_{2} O$
$RNCO + 2 K O H ⟶ RN H_{2} + K_{2} C O_{3}$
$RCON H_{2} + B r_{2} + 4 K O H ⟶ RN H_{2} + 2 K B r + K_{2} C O_{3} + 2 H_{2} O$

Q. Among the following which one does not act as an intermediate in Hofmann rearrangement

RNCO

RCON¨

RCON¨HBr

RNC

RC∣∣O​NH2​+Br2​+KOH⟶RCONHBr+KBr+H2​O RCONHBr+KOH⟶RNCO+KBr+H2​O RNCO+2KOH⟶RNH2​+K2​CO3​ RCONH2​+Br2​+4KOH⟶RNH2​+2KBr+K2​CO3​+2H2​O

$RNCO$

$RCO \ddot{N}$

$RCO \ddot{N} H B r$

$RNC$

$R C ∣∣ O N H_{2} + B r_{2} + K O H ⟶ RCON H B r + K B r + H_{2} O$
$RCON H B r + K O H ⟶ RNCO + K B r + H_{2} O$
$RNCO + 2 K O H ⟶ RN H_{2} + K_{2} C O_{3}$
$RCON H_{2} + B r_{2} + 4 K O H ⟶ RN H_{2} + 2 K B r + K_{2} C O_{3} + 2 H_{2} O$