| http://www.w3.org/ns/prov#value | - Suitable leaving groups are halogens, for example F, Cl, Br and I; alkyl sulfonate esters (???OSO2R) wherein R is an alkyl group, for example methanesulfonate (mesylate), trifluoromethanesulfonate, ethanesulfonate, 2,2,2-trifluoroethanesulfonate, perfluoro butanesulfonate; aryl sulfonate esters (???OSO2Ar) wherein Ar is an aryl group, for example p-toluoylsulfonate (tosylate), benzenesulphonate wh
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