US PATENT SUBCLASS 548 / 300.7
.~.~.~.~ Spiro

Current as of: June, 1999
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548 /   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) {4}
100  DF  .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18}
300.1  DF  .~.~.~ 1,3-diazoles (including hydrogenated) {9}
300.7.~.~.~.~ Spiro {2}
301.1  DF  .~.~.~.~.~> One of the two rings which form the spiro is part of a polycyclo ring system
301.4  DF  .~.~.~.~.~> Acyclic chalcogen bonded directly at the 2- and at the 4- or 5- positions of the 1,3-diazole ring [e.g., cyclohexanespiro-5'-(3'-hydroxymethyl) hydantoin, etc.]

DEFINITION

Classification: 548/300.7

(under subclass 300.1) Compounds which contain a spiro ring system.

(1) Note. This subclass provides for compounds containing a 1,3-diazole ring and a spiro ring system whether or not the diazole ring is one of the cyclos in the spiro system.

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

[figure] [figure]