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