Question

Explain the following reaction:- Lossen reaction.

Answer 1

Lossen reaction is named after the name of its discoverer and is typically a conversion reaction which converts the functional group -COOR to the compound containing the functional group as $N{{H}_{2}}$. Now you can easily write the chemical reaction.

Complete answer:
First, we should know what a chemical reaction is. The reaction in which the reactants react with each other to form two or more products is known as the chemical reaction. The reactants are written on the left hand side and the products are written on the right-hand side and there is an arrow from left to the right symbolizing a complete chemical reaction.
Example: consider the general reaction as:
$A+B\to C+D$
Here, A and B are the reactants and C and D are the products and the arrow indicates the direction in which the chemical reaction occurs.
Now considering the statement as;
Lossen reaction is that chemical reaction which involves the conversion of the ester particularly hydroxamate to isocyanate. It is named as loosen after the name of its discoverer Wilhelm Lossen. This reaction is also known as Lossen rearrangement reaction.
The chemical reaction is supposed to take place as;
$\begin{aligned} & RONHOOR\xrightarrow[-RC{{O}_{2}}]{O{{H}^{-}}}RN=C=O \\\ & Ester\text{ Isocyanate} \\\ \end{aligned}$
In this reaction, the isocyanate formed is further used in the formation of ureas in the presence of $N{{H}_{2}}$ group i.e. amines.
Isocyanate can also be used to produce amines in the presence of water.

Note:
After writing the reaction check whether the no of moles of each atom are same on both the sides or not and if not, then balance the chemical reaction because it helps to conserve the mass of that very atom/substance or the compound.