US PATENT SUBCLASS 546 / 252
.~.~.~.~.~ Starting materials include a nitrogen containing hetero ring (e.g., starting materials include a piperidine ring, etc.)

Current as of: June, 1999
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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  DF  .~.~.~ Process of forming pyridine ring {1}
251  DF  .~.~.~.~ The pyridine ring is unsubstituted or hydrocarbyl substituted only {3}
252.~.~.~.~.~ Starting materials include a nitrogen containing hetero ring (e.g., starting materials include a piperidine ring, etc.)

DEFINITION

Classification: 546/252

Starting materials include a hetero ring having at least nitrogen as a ring hetero atom (e.g., starting materials include a piperidine ring, etc.):

(under subclass 251) Processes wherein the starting materials include a compound having a hetero ring which contains a ring nitrogen.