{HEAD ~ The process} 11, wherein {TAIL ~ 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 0.1 part by volume or less, based on 1 part by volume of the tert butyl alcohol 
{ HEAD ~ The process } 11 , wherein { TAIL ~ 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 0.1 part by volume or less , based on 1 part by volume of the tert butyl alcohol
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH 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 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