Arun R Jagdale, Pandurang V Chouthaiwale & Arumugam Sudalai* Chemical Engineering and Process Development Division, National Chemical Laboratory, Pashan Road, Pune 411 008, India E-mail: a.sudalai@ncl.res.in Received 5 January 2009; accepted (revised) 8 May 2009 ... Copper(II) triflate catalyses efficiently the α-halogentaion of aryl or alkyl ketones with 1,3-dichloro-5,5′-dimethyl- hydantoin and N-bromosuccinimde to give the ...