| http://www.w3.org/ns/prov#value | - kyl substituted aromatic or an aromatic substituted alkyl group having from 6 to 15 carbon atoms, or where R21 and R22 are joined to form a ring having from 3 to 8 carbon atoms and optionally contain a metal therein such as Si or Ge with the ring optionally containing hydrocarbyl substituents such as alkyl substituents having from 1 to 8 carbon atoms, or an enolate of the formula ##STR4## wherein
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