Table 1. E-to-Z and Z-to-E switching conditions for 1 and 2. See ESI and Tables S1 and S2 for details.

Entry	Catalyst	Conditions	E : Z
1	1	CH2Cl2 : EtOAc 1 : 4, 395 nm, 700 mW, 20 min, 0.3 mg ml–1	21 : 79
2	1	DMF, 90 °C, 5 h, 0.2 mg ml–1	90 : 10
3	1	EtOAc, 0.1% CF3CO2H, 60 min, 50 °C, 0.02 mg ml–1	98 : 2
4	2	CH2Cl2 : EtOAc 1 : 4, 395 nm, 700 mW, 20 min, 0.3 mg ml–1	21 : 79
5	2	EtOAc, 0.1% CF3CO2H, 60 min, 50 °C, 0.02 mg ml–1	99 : 1
6	2	CHCl3, 0.25 eq. CF3CO2H, 24 h, 40 °C, 0.1 mg ml–1	5 : 95