The Study of Nucleophlic and Electrohilic Reaсtions of Bis- and 3-Substituted Chroman-2, 4-Dions

Aims: Here we study nucleophilic and electrophilic reactions of bis - and condensed 3substituted chroman-2,4-dions to produce polychromeno (thio)pyrans and trioxaoxonium benzonaphthotetracene salts. Place and Duration of Study: Saratov State University, Chemistry Institute, between September 2011 and July 2012. Results: Reactions of phenylmethylene bis -chroman-2,4-dion, 3-substituted chroman-2, 4dion with nucleophilic and electrophilic reagents were studied. Intramolecular Oheterocyclization to polyheteronuclear systems with key chromeno (thio) pyrano fragments of various saturation degrees is shown to be characteristic of the compounds studied. It is noted that phenylmethylene bis chroman-2,4-dion, under the action of phosphorus pentasulfide and hydrogen sulfide in situ, forms bis chromeno thiopyrans. Conclusion: Optimal heterocyclization conditions for 3-substituted chroman-2,4-dion with boron trifluoride etherate to trioxaoxonium benzonaphthotetracene salts were found.