The [4+2], not [2+2], mechanism occurs in the gold-catalyzed intramolecular oxygen transfer reaction of 2-alkynyl-1,5-diketones.
Liu
Le-Ping
LP
Department of Chemistry, University of Louisville, 2320 South Brook Street, Louisville, KY 40292, USA. leping.liu@louisville.edu
Malhotra
Deepika
D
Paton
Robert S
RS
Houk
K N
KN
Hammond
Gerald B
GB