Naik, Mayuri M.; Kamat, D.P.; Tilve, S.G.; Kamat, V.P.
(Tetrahedron. 70(34); 2014; 5221-5233.)
Molecular iodine as an inexpensive catalyst is described in the construction of 2-substituted or 2,2-disubstituted chromans and 4-aryl-3,4-dihydrobenzopyran-2-ones via [3+3] cyclocoupling. For the synthesis of chromans, ...