US PATENT SUBCLASS 548 / 447
.~.~.~.~.~.~.~.~.~ Processes of forming by cyclization or alkylation

Current as of: June, 1999
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548 /   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) {4}
400  DF  .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20}
416  DF  .~.~.~ Polycyclo ring system having the five-membered hetero ring as one of the cyclos {5}
427  DF  .~.~.~.~ Tricyclo ring system having the five-membered hetero ring as one of the cyclos {6}
439  DF  .~.~.~.~.~ The five-membered hetero ring shares ring carbons with two carbocyclic rings (e.g., tetrahydrocarbazoles, etc.) {3}
440  DF  .~.~.~.~.~.~ The five-membered hetero ring shares ring carbons with two benzene rings (i.e., carbazoles) {5}
445  DF  .~.~.~.~.~.~.~ The tricyclo ring system is unsubstituted or is hydrocarbyl substituted only (e.g., N-vinyl carbazole, etc.) {1}
446  DF  .~.~.~.~.~.~.~.~ Carbazole per se or alkyl substituted only {1}
447.~.~.~.~.~.~.~.~.~ Processes of forming by cyclization or alkylation

DEFINITION

Classification: 548/447

(under subclass 446) Processes of preparing unsubstituted carbazole or alkyl substituted carbazoles only, by cyclization or by alkylation.

(1) Note. The unsubstituted carbazole is prepared by cyclization (e.g., of o-aminobiphenyl). The alkyl carbazoles are prepared either by cyclization (e.g., of an alkyl substituted o-aminobiphenyl), or by alkylation of carbazole.