Which of the following is the proper order of addition of reagents in Vial A prior to quenching with methanol?
A. R-HBTM β unknown alcohol β butyric anhydride + Et3N
B. unknown alcohol β R-HBTM β butyric anhydride + Et3N
C. S-HBTM β unknown alcohol β butyric anhydride + Et3N
D. unknown alcohol β butyric anhydride + Et3N β S-HBTM
E. unknown alcohol β S-HBTM β butyric anhydride + Et3N
F. unknown alcohol β butyric anhydride + Et3N β R-HBTM