| http://www.w3.org/ns/prov#value | - Alternatively a noble metal catalyst, e.g. a Pt or Pd catalyst may be used, optionally in thepresence of a weak base such as sodium acetate or a heterogeneous or homogeneous catalyst, e.g. PdCl.sub.2 (PhCN).sub.2, RhCl[(C.sub.6 H.sub.5).sub.3 P].sub.3 Ru.sub.3 (CO).sub.12 or IrCl(CO)[(C.sub.6 H.sub.5).sub.3 P].sub.2.Preferably the rearrangement is carried out in the presence of acetic acid, a nobl
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