10-[1,1-Di­chloro-4-(tri­methyl­sil­yl)but-1-en-3-yn-2-yl]-10H-pheno­thia­zine

The title compound, C19H17Cl2NSSi, is an enamine derivative, in which the N atom adopts a shallow trigonal–pyramidal geometry [displacement from the plane of its attached C atoms = 0.1383 (18) A]. The dihedral angle between the plane through the three amino carbon atoms and the vinyl group is 89.47 (7)°. The pheno­thia­zine unit has a butterfly structure and the central six-membered ring adopts a boat conformation. The fold angle between the benzene rings is 28.52 (7)°. The crystal structure features weak Csp3—H⋯Cl hydrogen bonds, H⋯S contacts and π–π stacking inter­actions between pheno­thia­zine units.