| Abstract
| - A family of proazaphosphatrane ligands [P(RNCH2CH2)2N(R‘NCH2CH2): R = R‘ = i-Bu, 1; R =Bz, R‘ = i-Bu, 3; R = R‘ = Bz, 4] for palladium-catalyzed Stille reactions of aryl chlorides is described.Catalysts derived from ligands 1 and 4 efficiently catalyze the coupling of electronically diverse aryl chlorideswith an array of organotin reagents. The catalyst system based on the ligand 3 is active for the synthesisof sterically hindered biaryls (di-, tri-, and tetra-ortho substituted). The use of ligand 4 allows room-temperature coupling of aryl bromides and it also permits aryl triflates and vinyl chlorides to participate inStille coupling.
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