Table 1. Double Tsuji–Trost Allylation Reactions of bis-Carbonate 16 Catalyzed by Palladium Complexes of Ligands 17a–c.

		Product ratioa
Entry	Ligand	18a	18b	18c	18d	Yieldb
1	17c	45	9	46	–	–
2	17a	40	49	11	–	75%
3	17b	37	–	63	–	70%
4	(±)-17a/b	42	7	51	–	–

^aRatio of diastereomeric products 18a–d determined by ¹H NMR analysis of crude material.

^bCombined yield of diastereomeric products 18 isolated by chromatography.