Gold-Catalyzed Oxidative Rearrangement of Homopropargylic Ether via Oxonium Ylide

Mei Xu, Tian-Tian Ren, and Chuan-Ying Li  

http://pubs.acs.org/doi/abs/10.1021/ol302238t

I'm posting this report mainly because it describes an increasingly more "popular" mechanism type -- namely, gold carbenoid intermediate.  Also, this report showcases an interesting use of this mechanism to generate cyclobutenones and alpha,beta-unsaturated ketones.