Synthesis and Photochromism of Quinolines and Benzo[h]quinolines of 1,3-Diazabicyclo[3.1.0]hex-3-ene

Table 1

The absorption changes for 3–10 in ethanol at 254 nm. Spectra and 𝜆^𝐴_max′ 𝜆^𝐵_max′ 𝜆_ex′ 𝜀, and percent yield of 3–10.

Entry	𝜆ex′ (nm)	𝜆^𝐴max′ (nm)	𝜆^𝐵max′ (nm)	𝜀 (cm^−1M^−1)/EtoH	Yield (%)
3	236	208,232,316	208,232,406	3.91	75
4	241	206,236,320	221,262,376	8.31	82
5	245	208,239	207,241,404	3.75	80
6	249	213,238	211,239,361	8.02	76
7	253	212,246	211,248,403	3.31	61
8	254	213,242	214,245,366	10.67	79
9	271	204,235,276	203,277,403	6.40	78
10	272	212,237	211,280,379	4.94	73