Synthesis, structure and spectral study of two types of novel fluorescent BF2 complexes with heterocyclic 1,3-enaminoketone ligands

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

“…119.5-120.7 °C). The structure of 1 was determined by 1 H NMR, 13 C NMR, IR, and FAB HRMS measurements. 37 The polycycloaddition reactions of the homoditopic nitrile N-oxide 1 to model diyne 2 and polymeric diynes (3 and 4) were carried out in absence of a catalyst by heating in refluxing CHCl 3 for 12 h to give high molecular weight polyisoxazoles poly-1, PEG-1, and PTHF-1, respectively, in high yields (Scheme 2 and Table 1).…”

“…Therefore, the use of boron enaminoketonate (BEK) as a substitute of boron diketonate is intriguing, because it is expected from the structural analogy that the BEK would serve as a fluorophore with good optical properties similar to those of boron diketonate. 13,14 Recently, Chujo et al have revealed the optical properties of BEKs such as large Stokes 3 shift and high-molar absorption coefficient that are quite similar to those of boron diketonates.…”

Difluoroboron complexes of functionalized dehydroacetic acid: electrochemical and luminescent properties

“…The formation of such difluoroboron complexes present two advantages: (i) it enhances the reactivity of DHA itself and (ii) some of these derivatives can exhibit fluorescence properties. 5…”

Synthesis of enaminones and their difluoroboron complexes through domino aryl migration

“…8 Many efforts have been devoted to the synthesis and applications of difluoroboron complexes in the past decade. 9 A literature survey on this topic shows that the synthesis of difluoroboron β-ketoiminates involves the preparation of enaminones followed by the treatment with BF 3 . 9 There has not been a report on domino reaction approaches to enaminone-difluoroboron complexes in a simple one-pot operation.…”

“…9 A literature survey on this topic shows that the synthesis of difluoroboron β-ketoiminates involves the preparation of enaminones followed by the treatment with BF 3 . 9 There has not been a report on domino reaction approaches to enaminone-difluoroboron complexes in a simple one-pot operation. During our ongoing domino projects, we found a new methodology for the synthesis of these stable complexes as shown in Scheme 1.…”