US PATENT SUBCLASS 546 / 249
.~.~.~ Process of forming partially hydrogenated pyridine ring

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546 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {1}
1  DF  .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbons {24}
249.~.~.~ Process of forming partially hydrogenated pyridine ring

DEFINITION

Classification: 546/249

Process of forming partially hydrogenated pyridine ring:

(under subclass 1) Compounds whereby a partially hydrogenated pyridine ring is formed, i.e., a six-membered hetero ring consisting of one nitrogen and five carbons having one or two double bonds between the ring members.

(1) Note. Included herein are processes of forming the partially hydrogenated pyridine ring by any means, e.g., ring closure, ring expansion, dehydrogenation, hydrogenation,

etc.