US PATENT SUBCLASS 552 / 293
.~ Cyclohexadiene having atoms double bonded directly at the 1- and 4- positions (e.g., paraquinones, etc.)

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552 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
293.~ Cyclohexadiene having atoms double bonded directly at the 1- and 4- positions (e.g., paraquinones, etc.) {11}
294  DF  .~.~> Phosphorus, heavy metal or aluminum containing
295  DF  .~.~> Polycyclo ring system having the cyclohexadiene as one of the cyclos {2}
301  DF  .~.~> Nitrogen double bonded directly at the 1- and 4- positions
302  DF  .~.~> Nitrogen double bonded directly at the 1- or 4- positions
303  DF  .~.~> Carbon double bonded directly at the 1- and 4- positions
304  DF  .~.~> Carbon double bonded directly at the 1- or 4- position
305  DF  .~.~> Sulfur bonded directly at the 2-, 3-, 5- or 6- position
306  DF  .~.~> Nitrogen bonded directly at the 2-, 3-, 5- or 6- position
307  DF  .~.~> Oxygen bonded directly at the 2-, 3-, 5-, or 6- position
308  DF  .~.~> Halogen bonded directly at the 2-, 3-, 5-, or 6- position
309  DF  .~.~> Carbon donded directly at the 2-, 3-, 5- or 6- position {1}

DEFINITION

Classification: 552/293

(under subclass 1) Compounds under Class 532, ..., wherein atoms are double bonded directly at the 1- and 4- positions of a cyclohexadiene ring.

(1) Note. For this and indented subclasses, the cyclohexadiene ring is numbered as follows: [figure]

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