Figure 8.

UPLC traces of crude reaction mixtures from the competition experiments shown in Figure 7 using 1:1 mixtures of azides: (a) phenol monomer 25 and phosphine oxide monomer 5 and (b) phenol monomer 25 and phosphine oxide 2-mer 7. Reaction conditions: [24] = 0.1 mM, [25] = 0.15 mM, [5] or [7] = 0.15 mM, [Cu(CH₃CN)₄PF₆·TBTA] = 0.2 mM in CH₂Cl₂, stirring at room temperature for 48 h. See Figure 7 for the chemical structures. UPLC conditions: C18 column at 40 °C (254 nm) using water + 0.1% formic acid (A) and CH₃CN + 0.1% formic acid (B); Gradient of 0–4 min 5% −100% B + 1 min 100% B.