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4Room temperature synthesis of 2H-1,4-benzoxazine derivatives using a recoverable ionic liquid medium, Environmental Chemistry Letters The Enantiomers of 2-Donor-Substituted Benzopyrans and Benzo-1,4-oxazines and Their Thermal Racemization, Organic Photochromic and Thermochromic Compounds Synthesis and Study of Isomeric Benzo[1,4]oxazines and Benzothiazolines by NMR Spectroscopy and X-Ray Crystallography, Monatshefte f??r Chemie / Chemical Monthly