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 {HEAD ~ the other inert solvent} is used in {TAIL ~ an amount} of 0.1 part by volume or less, based on 1 part by volume of the tert butyl alcohol 
is used in
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 { HEAD ~ the other inert solvent } is used in { TAIL ~ an amount } of 0.1 part by 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 HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH