| http://www.w3.org/ns/prov#value | - The preparation of esters using dipyridyl disulphide and triphenylphosphine is carried out by reacting the corresponding acid with an appropriate alcohol R4 OH, wherein R4 is other than a hydrogen atom, or thiol R4 SH, wherein R4 is other than a hydrogen atom, in an inert organic solvent, e.g. toluene, benzene or xylene, at a temperature from ambient to 80??? C.
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