US PATENT SUBCLASS 552 / 238
.~.~ Nitrogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position)

Current as of: June, 1999
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552 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
208  DF  .~ Polycyclo ring system containing anthracene configured ring system having at least one double bond between ring members and having oxygen single bonded or any atom double bonded directly at the 9- and 10-positions (e.g., anthraquinones, etc.) {19}
238.~.~ Nitrogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position) {7}
239  DF  .~.~.~> Cyano bonded directly to the anthracene configured ring system
240  DF  .~.~.~> Oxygen bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position) {1}
243  DF  .~.~.~> Oxygen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position) {4}
249  DF  .~.~.~> Halogen bonded directly to the anthracene configured ring system {1}
251  DF  .~.~.~> Carbon bonded directly to the anthracene configured ring system {1}
253  DF  .~.~.~> Oxygen or sulfur bonded directly to the nitrogen (e.g., 1- nitroanthraquinone, etc.) {1}
255  DF  .~.~.~> Additional carbon bonded directly to the nitrogen {3}

DEFINITION

Classification: 552/238

(under subclass 208) Compounds wherein an alpha position (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system has nitrogen bonded directly thereto.

(1) Note. This subclass contains, for example: [figure]