Table 3.

Effect of the electrode distance on the yield of the reduction products 3a and 4^a.

Entry	Electrode distance/µm (residence time/s)	Yield of 3a (%)b	Yield of 4 (%)b	Selectivity 3a/4
1	80 (7.9)	35	26	1.35
2	40 (3.9)	47	33	1.42
3	20 (2.0)	21	27	0.78

^aExperimental conditions: cathode, GC plate; anode, Pt plate; solvent, electricity, 2.15 F mol⁻¹; current density, 12.7 mA cm⁻²; solvent, THF; substrate, 0.06 M benzylideneaniline (1) and 0.12 M 1,4-dibromobutane (2a); supporting electrolyte, 0.14 M n-Bu₄N∙ClO₄; flow rate, 11 mL h⁻¹. ^bDetermined by HPLC.