Table 3.

The yield of diphenyl selenide 3aa upon changing the ratio 1a/2a.

entry	amount of 1a	amount of 2a	yield of 3aaa
1	0.1 mmol	0.5 mmol	69% 0.138 mmol
2	0.1 mmol	0.3 mmol	69% 0.138 mmol
3	0.1 mmol	0.1 mmol	59% 0.118 mmol
4	0.1 mmol	0.067 mmol (2/3 equiv)	57% 0.118 mmol
5	0.2 mmol	0.1 mmol	88%b 0.263 mmol

^aThe yields were determined by HPLC based on the amount of 1a. ^bThe yield was calculated based on the amount of 2a.