Scheme 2.
Synthesis of HOPOs L1H, L2H and L3H. i) EDCI, NHS, DMF, ii) R-NH2, THF, iii) AcOH/HClconc (1:1), iv) H2 (30 psi), Pd/C (10%), MeOH, v) Zr(acac)4, MeOH. L1′H was prepared in accordance with the reported procedure.41
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