Table 3.

Ruthenium(II)-Catalyzed Photoinduced Cleavage of N–N Bonds^a

Entry	Substrate	Product	Yield (%)
1	1c	2c	82
2	1d	2d	81
3	1e	2e	54
4	1f	2f	47
5	1g	2g	68b
6	1h	2h	51b
7	1i	2i	37
8	1j	–	–
9	1k	2k	36
10	1l	2l	88
11	1m	2m	58

^aReactions were performed on 0.3–0.5 mmol scale in 3–5 mL solvent with 2 mol% 3a. A household 13 W light bulb was used as the light source. Reaction time ranged from 4 to 28 h.

^bDue to the instability of these hydrazine derivatives, the crude products were subjected to the cleavage reaction directly after Boc-deprotection. The yields given refer to overall yields for the two steps.