Sulfones, Alloc-derived

Scheme 5 Allylation of Alloc-derived sulfones and ring-closing metathesis of an Alloc-protected homoallylic amine...

The most important of all these leaving groups are those based on sulfonate esters. The intermediates in the PBr3 reaction are unstable, but it is usually easy to make stable, usually crystalline loluene-pura-sulfonatcs from primary and secondary alcohols. We met these derivatives on p. 422. These i sol able but reactive compounds are so popular that they have been given a trivial name (Tosylates ) and the functional group has been allocated an organic element symbol Ts. This is what it means. 

---