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

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