Table 1.

Optimization of the reaction conditions.

entry	reaction conditions	λirr (nm)	products, yield (%)
1	1a (0.02 M), CH2Cl2	310	–a
2	1a (0.02 M), CH3CN	310	–a
3	1a (0.02 M), acetone	310	–a
4	1a (0.02 M), CH3OH	310	2a, 3b
5	1a (0.02 M), CH3OH/H2O 2:1	310	2a, 16; 2b, 1
6	1a (0.01 M), CH3OH/H2O 2:1	310	2a, 6
7	1a (0.01 M), CH3OH/H2O 2:1	254	2a, 44
8	1a (0.02 M), CF3CH2OH	310	2a, 45; 2b, 2
9	1a (0.02 M), CF3CH2OH/acetone 9:1	310	2a, 38; 2b, 2
10	1a (0.02 M), CF3CH2OH/acetone 4:1	310	2a, 67; 2b, 4
11	1a (0.02 M), CF3CH2OH/acetone 7:3	310	2a, 48; 2b, 3
12	1a (0.02 M), CF3CH2OH/acetone 1:1	310	2a, 14; 2b, 2
13	1a (0.04 M), CF3CH2OH/acetone 4:1	310	2a, 57; 2b, 2
14	1a (0.06 M), CF3CH2OH/acetone 4:1	310	2a, 67; 2b, 12
15	1a (0.02 M), CF3CH2OH/acetone 4:1c		–a

^aNo consumption of 1a observed; ^b30% consumption of 1a measured; ^cthe reaction mixture was stored in the dark for 24 h.