US PATENT SUBCLASS 585 / 404
.~ By ring expansion or contraction

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

400  DF  AROMATIC COMPOUND SYNTHESIS {15}
404.~ By ring expansion or contraction {1}
405  DF  .~.~> Using transition metal-containing catalyst

DEFINITION

Classification: 585/404

By ring expansion or contraction:

(under subclass 400) Subject matter wherein a change in ring size and usually also dehydrogenation (removal of hydrogen from the ring) takes place.

SEE OR SEARCH THIS CLASS, SUBCLASS:

371+, for ring expansion or contraction phenomena in the synthesis of an alicyclic.