Fluorescent poly(boron enaminoketonate)s: synthesis via the direct modification of polyisoxazoles obtained from the click polymerization of a homoditopic nitrile N -oxide and diynes

Fluorescent poly(boron enaminoketonate)s (PBEKs) were synthesized via polycycloaddition of homoditopic nitrile N-oxide to diynes and subsequent polymer reactions. Click polycycloaddition of the nitrile N-oxide to various diynes effectively produced polyisoxazoles in high yields. Transformation of the polyisoxazoles afforded the corresponding fluorescent PBEKs via intermediary formation of poly(β-aminoenone) followed by the reaction with (C6F5)2BF·OEt2. The optical properties of PBEKs were evaluated by the UV–vis and fluorescent spectra obtained under solution and solid states.