Table 1. Effect of Organophosphorus Catalyst on Regioselectivity of Transpositive Allylic Reduction^a.

entry	R3Pb	yieldc	ratioc (4:5)
1	none	80	9:91
2	6	78	18:82
3	7	85	11:89
4	8	95	19:81
5	9	95	54:46
6	10	96	94:6
7	10 d	100	98:2
8	10 e	81	88:12
9	11	96	91:9

^aSee Supporting Information for full experimental details.

^bSee ref 17.

^cThe combined yield and ratio of 4 and 5 were determined by GC analysis (dodecane internal standard).

^dNeutral trivalent 10 as catalyst.

^e10·HBF₄ salt as precatalyst.