Here's the general reaction:
3ROH + PCl3 → R3PO3 + 3HCl
Where:
* R represents the alkyl group of the alcohol.
* ROH represents the alcohol.
* PCl3 represents phosphorus trichloride.
* R3PO3 represents the trialkyl phosphite, the main organic product.
* HCl represents hydrogen chloride gas.
This reaction is an example of a nucleophilic substitution reaction. The alcohol acts as a nucleophile, attacking the phosphorus atom in PCl3. This results in the formation of an alkyl chloride and the release of HCl gas.