How do I know the main product of the reaction between phosphorus(V) chloride and ethanol?
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You could try googling "reaction of PCl5 with alcohols" In which case you might find this https://www.chemguide.co.uk/organicprops/alcohols/halogen.html or this https://crab.rutgers.edu/~alroche/Ch11.pdf or even this Reaction of alcohols with PCl5 and PCl3
TL:DR The product is ethyl chloride and POCl3