US PATENT SUBCLASS 540 / 218
.~.~.~.~.~.~.~ Ring expansion to produce the bicyclo ring system

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}
214  DF  .~.~.~.~.~ The six-membered ring contains sulfur {1}
215  DF  .~.~.~.~.~.~ 1-thia-5-aza-bicyclo(4.2.0)octane (including unsaturated; e.g., cepham, etc.) {9}
218.~.~.~.~.~.~.~ Ring expansion to produce the bicyclo ring system

DEFINITION

Classification: 540/218

(under subclass 215) Processes in which a cepham or cephem ring system is produced by the enlargement of the corresponding thiazole containing ring system: (i.e., the structure below) in which the rings may contain double bonds. [figure]