Effect of the reaction parameters^a.

Entry	Variation from standard conditions	Yieldb (%)
1	Standard conditions	94
2	No DDQ	45
3	No HOAc	54
4	BQ instead of DDQ	61
5	Na2CO3 instead of HOAC	62
6	MeCN only	54
7	DCE only	37
8	6 mA, 4 h	78
9	15 mA, 2 h	85
10	Carbon cloth as cathode	75
11	Ni plate as cathode	57
12	Fe plate as cathode	78
13	In air	60
14	No electric current	N.D.c
15	No electric current, in air	N.D.c

^aReaction conditions: graphite rod anode (ϕ 6 mm), Pt plate cathode (15 mm × 15 mm × 0.3 mm), constant current = 10 mA, 1a (0.20 mmol), 2a (0.40 mmol), ⁿBu₄NBF₄ (0.20 mmol), MeCN/DCE (4/2 mL), rt, 2 h (3.7 F mol⁻¹), undivided cell, and nitrogen.

^bIsolated yields.

^cN.D. = not detected.