US PATENT SUBCLASS 552 / 254
.~.~.~.~ Plural nitrogens bonded directly at alpha positions (i.e., 1-, 4-, 5- or 8 positions, e.g., 1, 5- dinitroanthraquinones, etc.)


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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}
253  DF  .~.~.~ Oxygen or sulfur bonded directly to the nitrogen (e.g., 1- nitroanthraquinone, etc.) {1}
254.~.~.~.~ Plural nitrogens bonded directly at alpha positions (i.e., 1-, 4-, 5- or 8 positions, e.g., 1, 5- dinitroanthraquinones, etc.)


DEFINITION

Classification: 552/254

(under subclass 253) Compounds wherein an additional nitrogen 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]