What is a reaction of Ca on a phenol?

Phenol reacts with Ca(OH)₂ in aq. or organic media and forms calcium phenol half-salts.
Ph-OH + Ca(OH)₂ -----------------> Ph-O-Ca-OH + H₂O
Phenol Calcium
phenol half-salt

Pyrolysis of calcium phenol half-salts yields calcium oxide and phenols unlike other alkali metal phenates which yields gas and char.This unexpected results with the organocalcium system suggested a new phenol separation/recovery approach.

Pyrolysis of Phenol at 550-650 degreeC
Ph-O-Ca-OH ----------------------> Ph-OH + CaO
Phenol Calcium oxide