US PATENT SUBCLASS 552 / 243
.~.~.~ Oxygen 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  DF  .~.~ Nitrogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position) {7}
243.~.~.~ Oxygen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position) {4}
244  DF  .~.~.~.~> Halogen bonded directly to the anthracene configured ring system
245  DF  .~.~.~.~> Carbon bonded directly to the anthracene configured ring system
246  DF  .~.~.~.~> Oxygen bonded directly to the nitrogen (e.g., nitro bonded directly at 8 position, etc.)
247  DF  .~.~.~.~> Additional carbon bonded directly to the nitrogen {1}

DEFINITION

Classification: 552/243

(under subclass 238) Compounds wherein oxygen is bonded directly to a remaining alpha position (i.e., 1-, 4-, 5- or 8- position) of the anthracene configured ring system.

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