STUDIES ON ORGANOPHOSPHORUS COMPOUNDS VI^1–5: Utility of Lawesson's Reagent for Synthesis of Thiaphosphorine, Thioxanthene, and Thiaphosphole Derivatives

Abstract

Arylidene malonate derivatives 2a–c reacted with Lawesson's reagent (1) LR in equimolar ratio to yield the oxathiaphosphorine derivatives 3a–c. The behaviour of LR towards cyclic ketones was also examined and yielded the thioxanthene derivatives 5a,b. On the other hand, arylidene pyrazolone 8 reacted with LR to give the phosphole 10. Aminobenzenethiophene 11 reacted with LR under reflux to produce the corresponding thiazaphosphorine 12.

Keywords:

• Arylidene
• lawesson's reagents
• phosphole
• thiaphosphorines
• xanthene