Compound -OH -C6H4
Scheme 1 A 12.02 6.53 – 7.24
(I) 12.12 6.33 – 7.44
(II) 11.92 6.30 – 7.46
Table 7: 1H NMR data of ligand* and its complexesa. aThe serial number corresponds to that used in Table 5. *No signals even weak, of the open ring tautomer (Scheme 1B) can be detected. Note: NH proton signal is observed at 4.18 ppm (Scheme 1A).