Table 1. Effects of the catalyst, chlorine donor, and light source on the benzylic chlorination of 11.

Entry	Catalyst	Cl source	Light source	11	12	13	14
1	A	CCl4a	350 nmb	81%	12%	7%	–
2	A	CCl4a	419 nmc	>95%	–	–	–
3	A	NCS	419 nmc	0%	68%	12%	20%
4	A	NCS	CFLd	15%	70%	13%	2%
5	B	NCS	CFLd	0%	74%	7%	19%
6	C	NCS	CFLd	0%	72%	7%	21%
7	D	NCS	CFLd	6%	70%	15%	8%
8	E	NCS	CFLd	21%	67%	10%	2%

^aNo acetonitrile, carbon tetrachloride is used as the solvent.

^b16× RPR-3500Å lamps (24 W, 300–420 nm).

^c16× RPR-4190Å lamps (24 W, 375–465 nm).

^d1× compact fluorescence lamp (19 W).