3′,6′-Bis(diethyl-amino)-3H-spiro-[2-benzo-thio-phene-1, 9′-xanthene]-3-thione

Abstract

The title compound, C28H30N2OS2, was obtained by thio-nation of 3′,6′-bis-(diethyl-amino)-3H-spiro-[isobenzofuran-1, 9′-xan-thene]-3-one with 2,4-bis-(p-methoxy-phen-yl)-1,3-dithia-diphos- phetane disulfide (Lawessons reagent). The planes of the two benzene rings of the xanthene system are inclined at a dihedral angle of 17.4 (1)°, and the plane of the dithio-phthalide group and the planes through the two benzene rings of the xanthene system make dihedral angles of 80.2 (1) and 82.8 (1)°, respectively.