[jessy]

PCl₃ + 3EtOH ---- (t,PhNEt₂,petrolether) P(OEt)₃
1.What is the mechanism of reaktion?
solution of diethylaniline hydrochloride
P³⁺ + EtO
product: P(OEt)₃

2.Why in this reaction we use PhNEt₂? Because at first it make solution of diethylaniline hydrochloride and then react?

3.What is the product of this reaction without PhNEt2?
I am not sure, but I think it is ethyl chloride and diethyl hydrogen phosphite

4. Is it diffrent with PrOH? Does PrOH react PCl₃ + 3 PrOH → Pr₂PH=O + PrCl + 2HCl?
What is the product at the first step? Is it Pr₂PH=O?
Can you help me please? 

[Hunter2]

Normally PCl₃ is a supplier to substitute OH to Cl. Also it means you get in this example Chlorine ethan and phosphorous acid H₃PO₃. By adding the Aniline compound the reaction is changed to form the ester.