The process 11, wherein the solvent of each reaction step is a mixture of tert butyl alcohol and an inert solvent other than the tert butyl alcohol, and the other inert solvent is used in an amount of {HEAD ~ 0.1 part} by {TAIL ~ volume} or less, based on 1 part by volume of the tert butyl alcohol 
by
The process 11 , wherein the solvent of each reaction step is a mixture of tert butyl alcohol and an inert solvent other than the tert butyl alcohol , and the other inert solvent is used in an amount of { HEAD ~ 0.1 part } by { TAIL ~ volume } or less , based on 1 part by volume of the tert butyl alcohol
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH