Lawesson's reagent (1a) reacts with pyrogallol (2) to give 1,3,2-benzodioxa
phospholane-2-sulfide (3) and with 1,8,9-trihydroxyanthracene to give 13. T
he structures of the products have been established either chemically, usin
g methanolysis and methylation, or spectroscopically. (C) 1999 John Wiley &
Sons, Inc.