Table 3.

Yields (%) of photoproducts obtained from the starting compounds 1–5 under direct irradiation for reactions performed in a batch reactor (followed by HPLC).

Compound	Wavelength (nm)	Conversion (%)	Yields of Photoproducts (%)
			Irr. Time	cis-	Dimer	Cycl. *	Cycl.2OH **	trans-	Undefined
1	313	80	30 min	52	8	3	1	20	16
	365	100	30 min	91	-	7	2	-	-
2	313	91	30 min	65	-	12	4	19	-
	365	93	30 min	62	-	9	5	24	-
3	313	17	30 min	17	-	-	-	83	-
	365	31	30 min	24	-	7	-	69	-
4	313	75	30 min	58	-	2	-	25	15
	365	83	30 min	83	-	-	-	17	-
5	313	90	30 min	45	-	15	-	10	30
	365	85	30 min	38	-	19	-	15	28

* product of photochemical electrocyclization depending on the starting compound (7, 11, 13–15, Scheme 1, Scheme 2 and Scheme 3); ** cyclization products with 2OH functional groups (8 and 12, Scheme 1 and Scheme 2).