Technical Notes:

1. Useful catalyst for the UIlmann synthesis.

2.Catalytic asymmetric 2 ,3-Sigmatropic rearrangement of sulfur ylides.

3.Precatalyst for enantioselective NH insertion reactions with diazoesters and anilines.

References： 1. J. Org. Chem., 1999, 64, 2986. 2. J. Org. Chem., 2002, 67, 5621. 3. J. Am. Chem. Soc., 2012, 134, 436.