| http://www.w3.org/ns/prov#value | - A leaving group, L, of choice is CF3SO2??? (triflate) but others also suffice, such as Br or I. The base used may vary but is preferably one of the hindered non-nucleophilic kind, of which an example is 2,6-di-tert-butyl-4-methyl pyridine.
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