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