Table 1. Anodic and cathodic half-wave potentials values (mV) measured using CV for selected [4]helicenes (10⁻³ M) in acetonitrile ([TBA][PF₆] 10⁻¹ M) at a Pt electrode (Ø = 3 mm, ν = 0.1 V s⁻¹), E vs. Fc/Fc⁺. Compounds are ranked by increasing first oxidation potentials. Red_n and Ox_n represent the n successive reduction and oxidation processes, respectively.

Molecule	Functional group (Y)	Reductiona			Oxidationa
		Red1	ΔE(Red1)b	Red2	Ox1	ΔE(Ox1)b	Ox2
5	NO2	−970	−256	−1778	1304c	420	—
6	CHO	−1059	−167	−1269	1131	247	—
17c	CO2Et	−1091	−135	—	1084	200	—
17f	CONHPr	−1120	−106	−1877	1000	116	—
1	H	−1226	0	—	884	0	—
9	N3	−1094	−132	−1834c	769	−115	1275c
16	CO2−	−1285	59	—	711c	−173	1006
15	OMe	−1164	−62	—	640	−244	1258c
7	NH2	−1201	−25	—	354	−530	781c
8	NMe2	−1191	−35	—	342	−542	673

^aHalf-wave potentials values, otherwise noted.

^bPotential difference compared to the first reduction or oxidation waves of compound 1.

^cIrreversible process.