US PATENT SUBCLASS 549 / 335
.~.~.~.~.~.~.~ Two six-membered hetero rings, which each contain plural ring oxygens, form the spiro (e.g., spirobi-(meta-dioxane), etc.)

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
330  DF  .~.~.~ Spiro {1}
331  DF  .~.~.~.~ The spiro includes a hetero ring {4}
333  DF  .~.~.~.~.~ Plural ring oxygens in a spiro hetero ring {3}
334  DF  .~.~.~.~.~.~ Both rings which form the spiro are hetero rings {1}
335.~.~.~.~.~.~.~ Two six-membered hetero rings, which each contain plural ring oxygens, form the spiro (e.g., spirobi-(meta-dioxane), etc.)

DEFINITION

Classification: 549/335

(under subclass 334) Compounds wherein both of the hetero rings in the spiro ring system are six-membered rings, each containing at least two ring oxygens.

(1) Note. An example of a compound provided for herein is: [figure]