US PATENT SUBCLASS 540 / 301
.~.~.~.~.~.~ 1-oxa-5-aza-bicyclo(4.2.0)octane (including unsaturated)

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
200  DF  .~.~ Hetero ring is four-membered containing nitrogen and having chalcogen double bonded directly to a ring carbon which is adjacent to the ring nitrogen {7}
203  DF  .~.~.~ Polycyclo ring system containing the hetero ring as one of the cyclos {4}
205  DF  .~.~.~.~ The ring nitrogen is shared by a six-membered ring {2}
300  DF  .~.~.~.~.~ The six-membered ring contains oxygen {1}
301.~.~.~.~.~.~ 1-oxa-5-aza-bicyclo(4.2.0)octane (including unsaturated)

DEFINITION

Classification: 540/301

(under subclass 300) Compounds in which the polycyclo ring

system has the following basic structure, which may contain double bonds between ring members: [figure]

(1) Note. The above ring system may be referred to as 1-oxa-5-aza-bicyclo [4.2.0] octane, 5-oxa-1-aza-bicyclo [4.20] octane, etc. However, compounds having ring systems with this configuration are classified in this subclass regardless how they are named.