SYNTHESIS OF DIBENZO DERIVATIVES OF (4-OXOTETRAHYDROPYRANO)OXA-14-CROWN-4 AND 1,4,7-TRIOXACYCLOHEXADECA-8,10,13,15-TETRAEN-12-ONE. TRANSFORMATION OF THE LATTER INTO (4-OXOPIPERIDINO)AZA-14-CROWN-4 Article An L.T., Levov A.N., Soldatenkov A.T., Gruzdev R.D., Khieu C.K. Russian Journal of Organic Chemistry. Vol. 44. 2008. P. 462-464
