It improves as a leaving group when there is alcohol and protonate. The chemicals we utilize for this are phosphorus trihalides (PX3, where X = halide) or thionyl halides in pyridine (SOX2, where X = halide).
The dehydration process of alcohols to produce alkene is carried out by heating the alcohols at high temperatures in the presence of a powerful acid, such as sulfuric or phosphoric acid.
Alcohols are converted into alkyl halides using PBr or SOCl2. The most popular processes for changing 1- and 2-alcohols into their corresponding chloro and bromo alkanes (replacing the hydroxyl group) are treatments with thionyl chloride (SOCl2) and phosphorus tribromide (PBr3), respectively.
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