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Expanding the Structural Diversity of N-H Borazines: A Hf(OTf)4-Catalyzed Synthesis from Aryl Boronates under
Ejdi Cela1, Alireza Nazari Khodadadi1, Fan Huang1
1Laboratory of Green S.O.C. - Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia, Via Elce di Sotto 8, 06123 Perugia, Italy.
Abstract:
For decades, the synthesis of B,B',B″-tri(aryl)borazines (N-H borazines) has been restricted to a limited number of studies with minimal structural diversity explored. Addressing this limitation, we developed a synthetic method exploiting cyclic boronates and a commercially available hafnium complex, Hf(OTf)4, as a catalyst. A range of N-H borazines is formed under microwave irradiation in a biomass-derived solvent, in a short reaction time of just 45 min, with high yields. This approach improved synthetic efficiency and functional group compatibility, enabling a more sustainable process and paving the way for further exploration of borazine applications.
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