Table 1 Optimization of reaction conditions


Entry	Variations from the standard conditions	Yield (%)^b
1^a	none	94 (86)^c
2	0.1 M, 2.5 mA·cm⁻², 0.1 F·mol⁻¹	85
3	1.0 mA·cm⁻², 0.025 F·mol⁻¹	72
4	4.0 mA·cm⁻², 0.1 F·mol⁻¹	93
5	t_R = 1 min, 4.0 mA·cm⁻²	94
6	t_R = 18 s, 13.3 mA·cm⁻²	91
7	nBu₄NBF₄ as electrolyte	26
8	nBu₄NPF₆ as electrolyte	89
9	under argon	94
10	dry CH₃CN	92
11	graphite anode	traces
12	stainless steel cathode	20
13	no electricity	0

^a Reaction conditions: tri-O-acetyl-D-glucal 1a (1.0 equiv.), benzyl alcohol 2b (2.0 equiv.), nBu₄NClO₄ (0.1 equiv.), CH₃CN (0.2 M), impervious graphite anode/graphite cathode, 2.0 mA·cm⁻², 0.05 F·mol⁻¹, room temperature, 0.15 mL·min⁻¹ flow rate, 2 min residence time. ^b Yields were determined by ¹H NMR analysis of the crude mixture, using diglyme as an internal standard. ^c Isolated yield.

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