Table 2.

Absorption data for derivatives 2a–d and 3''b measured in acetonitrile and methylene chloride at rt.

	Acetonitrile			Methylene chloride
	λabs (nm)	conc. (M)	log ε	λabs (nm)	conc. (M)	log ε
2'a	278; 307	7.3E−05	3.95; 3.95	280; 309	7.45E−05	3.97; 3.99
2'b	280; 310	5.75E−05	4.00; 3.94	280; 315	6.47E−05	3.89; 3.83
2''b	280; 295 (sh); 313	7.81E−05	3.80; 3.83; 3.90	282; 295 (sh); 317	7.79E−05	3.77; 3.82; 3.92
3''b	275; 282	7.38E−05	3.97; 3.98	275; 282	6.85E−05	4.05; 4.06
2'c	278; 308	8.92E−05	3.83; 3.87	282; 294 (sh); 312	6.34E−05	3.90; 3.91; 3.97
2''c	280; 312	7.73E−05	3.70; 3.74	280; 294 (sh); 314	7.00E−05	3.79; 3.80; 3.86
2'd	276; 307	6.43E−05	3.88; 3.86	280; 309	6.87E−05	3.84; 3.87
2''d	276; 309	7.6E−05	3.70; 3.68	280; 311	6.98E−05	3.71; 3.74