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Synthesis of BEC‐, BC‐ and NP‐photocaged IPTGs 10 a, 10 b and 1: a) Triethyl orthoformate, pyridinium p‐toluenesulfonate, ethanol, reflux, 19 h (89 %); b) IPTG, p‐toluenesulfonic acid, CH2Cl2, RT, 20 h (45 %); c) 0.2 m LiOH (aq.), MeOH, 0 °C–RT, 1 h (59 %); d) IPTG, sulfuric acid, DMSO, 0 °C–RT, 24 h (21 %).
