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The presence of side products and intermediates during monomer formation can influence the resin characteristics by inducing chain termination and ramifications, affecting the polymerization and cure processes. This work investigated the diverse isomeric intermediates and side products that are present during the BisBz formation from bisphenol A, aniline, and formaldehyde by ion mobility coupled to tandem mass spectrometry (MS\/MS) and ion spectroscopy techniques. The species detected in this work suggest that these multifunctional phenols open diverse concurrent reaction pathways based on two main reactive steps: (i) the imine\/iminium phenol attack to form a phenylamino intermediate and (ii) the formaldehyde attack followed by dehydration to form the oxazine ring. The species observed also support previous studies of the benzoxazine formation mechanism and showcase the application of advanced analytical techniques in studying complex chemical systems.<\/jats:p>","DOI":"10.1021\/acsomega.4c06205","type":"journal-article","created":{"date-parts":[[2024,9,18]],"date-time":"2024-09-18T03:56:54Z","timestamp":1726631814000},"page":"40932-40940","source":"Crossref","is-referenced-by-count":5,"title":["Isomeric Speciation\nof Bisbenzoxazine Intermediates\nby Ion Spectroscopy and Ion Mobility Mass Spectrometry"],"prefix":"10.1021","volume":"9","author":[{"given":"Francisco\nW. M.","family":"Ribeiro","sequence":"first","affiliation":[{"name":"University of Sa\u0303o Paulo , , Av. 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G.; Gao, J.; Rega, N.; Zheng, G.; Liang, W.; Hada, M.; Ehara, M.; Toyota, K.; Fukuda, R.; Hasegawa, J.; Ishida, M.; Nakajima, T.; Honda, Y.; Kitao, O.; Nakai, H.; Vreven, T.; Throssell, K.; Montgomery, J. A., Jr.; Peralta, J. E.; Ogliaro, F.; Bearpark, M. J.; Heyd, J. J.; Brothers, E. N.; Kudin, K. N.; Staroverov, V. N.; Keith, T. A.; Kobayashi, R.; Normand, J.; Raghavachari, K.; Rendell, A. P.; Burant, J. C.; Iyengar, S. S.; Tomasi, J.; Cossi, M.; Millam, J. M.; Klene, M.; Adamo, C.; Cammi, R.; Ochterski, J. W.; Martin, R. L.; Morokuma, K.; Farkas, O.; Foresman, J. B.; Fox, D. J.\n          Gaussian 16. Revision C.01, 2016."},{"issue":"7","key":"2026081708303324700_cit47","doi-asserted-by":"publisher","first-page":"2815","DOI":"10.1039\/C0CP02133D","article-title":"Infrared Spectra\nof Protonated Neurotransmitters: Dopamine","volume":"13","author":"Lagutschenkov","year":"2011","journal-title":"Phys.\nChem. Chem. Phys."},{"key":"2026081708303324700_cit48","unstructured":"Johnson, R. 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