US PATENT SUBCLASS 552 / 226
.~.~.~.~ Oxygen, sulfur or halogen 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}
221  DF  .~.~ Sulfur bonded directly at beta position (i.e., 2-, 3-, 6- or 7-position) {4}
225  DF  .~.~.~ Nitrogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position) {2}
226.~.~.~.~ Oxygen, sulfur or halogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position) {1}
227  DF  .~.~.~.~.~> Plural nitrogens, plural oxygens, plural sulfurs, or plural halogens bonded directly at alpha positions

DEFINITION

Classification: 552/226

(under subclass 225) Compounds wherein an alpha position (i.e., 1-, 4-, 5-, or 8- position) of the anthracene configured ring system has halogen, sulfur or oxygen bonded directly thereto.

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