1.1
Reagents:
Methanesulfonic acid
Solvents:
Methanol
;
3 h, 15 °C; 15 °C → -35 °C
1.2
Reagents:
Boron trifluoride etherate
,
Triethylsilane
Solvents:
Diethyl ether
;
2 h, -35 °C

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