Question

Why is thionyl chloride preferred?

Answer 1

We have to know that thionyl chloride is an inorganic compound with the synthetic equation $SOC{l_2}$ . It is a modestly unstable vapid fluid with a terrible harsh smell. Thionyl chloride is basically utilized as a chlorinating reagent, with around $45,000$ tons each year being created during the mid $1990$‘s.

Complete answer:
We have to know that thionyl chloride is mostly utilized in the mechanical creation of organochlorine compounds, which are frequently intermediates in drugs and agrichemicals. It ordinarily is liked over different reagents, for example, phosphorus pentachloride, as its side-effects ( $HCl$ and $S{O_2}$) are vaporous, which works on decontamination of the item. A significant number of the results of thionyl chloride are themselves profoundly responsive and as such it is engaged with a wide scope of reactions.
Thionyl chloride responds exothermically with water to frame sulfur dioxide and hydrochloric corrosives. By a comparable interaction it additionally responds with alcohols to shape alkyl chlorides. On the off chance that the liquor is chiral the response for the most part continues through a $S{N_i}$ system with maintenance of stereochemistry; in any case, contingent upon the specific conditions utilized, sound system reversal can likewise be accomplished. Generally the utilization of $SOC{l_2}$ in mix with a tertiary amine, for example, pyridine was known as the Darzens halogenation, however this name is once in a while utilized by current scientists.

Note:
We have to know that the $SOC{l_2}$ is a receptive compound that can savagely deliver perilous gases upon contact with water and different reagents. It is likewise controlled under the Chemical Weapons Convention and recorded as a Schedule three substance since it is utilized in the "di-di" technique for creating G-arrangement nerve specialists.