Triethyloxonium tetrafluoroborate is a crystalline salt able to perform ethylations in both aqueous and non-aquous medium [28,29]. Et3Oþ1⁄2BF4 should be handled in a vented fumehood with adequate PPEs and stored in a freezer at 20 +C. The potential risk handling Et3 Oþ 1⁄2BF4 is softened by its non-volatile nature. In an aqueous medium Et3 Oþ 1⁄2BF4 undergoes complete acid hydrolysis within 80 min at 18 +C [30]:
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