Table 1.

Spectroscopic Data of Open Chain Tetrapyrroles

cpd	1H NMRa	UV-visb	MSc	elem. analysis (%)
19	10.87 (2H,br s, NH), 10.01 (1H, br s, NH), 7.80 (2H, d, J 7.2, ph), 7.46 (13H, m, ph), 7.09 (2H, m, β-py), 6.80 (1H, m, β-py), 6.69 (1H, m, β-py), 6.45 (2H, d, J 4.3, β-py), 6.37 (1H, d, J 4.2, β-py), 6.33 (1H, d, J 5.6, β -py)	386 (4.55), 588 (4.28)	559 [M]+	found: C, 79.9; H, 4.5; N, 9.9; C37H26O2N4 requires C, 79.6; H, 4.7; N, 10.0
20	11.21 (2H,br s, NH), 10.36 (1H, br s, NH), 7.65 (2H, d, J 7.9, ph), 7.37 (2H, d, J 7.9, ph), 7.28 (2H, d, J 7.5, ph), 7.16 (8H, m, β-py + ph), 6.73 (1H, m, β-py), 6.64 (3H, m, β-py), 6.34 (2H, m, β-py), 2.47 (3H, s, –CH3), 2.42 (3H, s, –CH3), 2.40 (3H, s, –CH3)	392 (4.67), 592 (4.39)	601 [M]+	found: C, 79.9; H, 5.5; N, 9.1; C40H32O2N4 requires C, 80.0; H, 5.4; N, 9.3
21	10.76 (2H, br s, NH), 9.90 (1H, br s, NH), 7.81 (2H, d, J 8.5, ph), 7.41 (2H, d, J 8.5, ph), 7.32 (2H, m, ph), 7.10 (2H, m, ph), 6.98 (4H, m, β-py + ph), 6.88 (2H, d, J 8.7, ph), 6.78 (1H, m, β-py), 6.69 (3H, m, β-py), 6.41 (1H, d, J 4.2, β-py), 6.31 (1H, d, J 5.4, β-py), 3.92 (3H, s, -OCH3), 3.87 (3H, s, -OCH3), 3.83 (3H, s, -OCH3)	409 (4.43), 595 (4.12)	649 [M]+	found: C, 74.3; H, 5.2; N, 8.4; C40H32O5N4 requires C, 74.1; H, 5.0; N, 8.6
22	10.93 (2H, br s, NH), 10.15 (1H, br s, NH), 7.72 (2H, d, J 8.0, ph), 7.41 (10H, m, ph), 7.15 (2H, d, J 5.5, β-py), 6.79 (1H, m, β-py), 6.74 (2H, d, J 4.0, β-py), 6.69 (1H, m, β-py), 6.41 (1H, d, J 4.3, β-py), 6.30 (1H, d, J 5.4, β-py), 1.40 (9H, s, - tert-butyl), 1.35 (18H, s, tert-butyl)	394 (4.62), 598 (4.33)	727 [M]+	found: C, 80.9; H, 6.7; N, 7.8; C49H50O2N4 requires C, 81.0; H, 6.9; N, 7.7

^aCDCl₃, 300 MHz, δ, ppm.

^bCH₂Cl₂ λ_max, nm (log ε).

^cFAB (m/z)