US PATENT SUBCLASS 585 / 425
.~.~ Ring carbon of one molecule joined to ring carbon of other

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

400  DF  AROMATIC COMPOUND SYNTHESIS {15}
422  DF  .~ By condensation of entire cyclic molecules or entire hydrocarbyl moieties thereof, e.g., polymerization, etc. {4}
425.~.~ Ring carbon of one molecule joined to ring carbon of other {2}
426  DF  .~.~.~> Through residue of nonring molecule, e.g., acetylene, etc.
427  DF  .~.~.~> Arylene bond formed using metal-containing agent

DEFINITION

Classification: 585/425

Ring carbon of one molecule joined to ring carbon of other:

(under subclass 422) Subject matter in which the condensation exploits ring carbon atoms of two feed molecules, for example, by fusing rings, forming biphenyl from benzene, etc.