1: 3,4-dihydro-1H-2-benzopyran With 2,3-dicyano-5,6-dichloro-p-benzoquinone; bis-[(trifluoroacetoxy)iodo]benzene in 1,2-dichloro-ethane T=80°C; 3 h; Inert atmosphere; 2: toluene-4-sulfonamide in 1,2-dichloro-ethane T=20°C; 3 h; Inert atmosphere;

[Fe(2,2':6',2'':6'',2''':6''',2''''-quinquepyridine)(MeCN)2](ClO4)2 in acetonitrile T=80°C; 12 h; Schlenk techniqueMolecular sieveInert atmosphere;

1: chloramine-T trihydrate T=80°C; 3 h; Molecular sieve; 2: 3,4-dihydro-1H-2-benzopyran With iodine in chloroform T=20°C; 20 h; Inert atmosphereMolecular sieve;

in xylene 8 h; Heating;