US PATENT SUBCLASS 546 / 250
.~.~.~ Process of forming 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}
250.~.~.~ Process of forming pyridine ring {1}
251  DF  .~.~.~.~> The pyridine ring is unsubstituted or hydrocarbyl substituted only {3}

DEFINITION

Classification: 546/250

Process of forming pyridine ring:

(under subclass 1) Processes of forming the pyridine ring, i.e., six-membered hetero ring consisting of one nitrogen and five carbons having three double bonds between the ring members.

(1) Note. Included here are processes of forming the pyridine ring by any means, e.g., ring closure, ring expansion, dehydrogenation, etc.