Fig. 4. (a) Synthesis of architecture 24 and subsequent recovery of intact boronate ester 13 by orthogonal hydrazone exchange, as evidenced by ESI-MS (negative mode) of (b) catalyst 19 (m/z 166 ([M – H]–), 333 ([2M – H]–)), (c) 13 (m/z 397 ([M – H]–)) and catechol 1 (m/z 197 ([M – H]–)), and (d) the solution obtained from incubation of multicomponent surface architecture 24 with hydrazide 16 and 1.0 mM catalyst 19 in DMSO-d6, 1.5 mM TFA, for 7 h at 40 °C (10: m/z 217 ([M – H]–)).
