US PATENT SUBCLASS 549 / 401
.~.~.~.~.~.~.~.~ Chalcogen bonded directly to the ring carbon para to the ring oxygen (e.g., chromones, etc.)

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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}
356  DF  .~.~.~ The hetero ring is six-membered {9}
381  DF  .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {4}
396  DF  .~.~.~.~.~ Bicyclo ring system having the hetero ring as one of the cyclos {2}
398  DF  .~.~.~.~.~.~ The bicyclo ring system consists of the hetero ring and a six-membered carbocyclic ring {6}
399  DF  .~.~.~.~.~.~.~ Chalcogen bonded directly to the hetero ring {2}
401.~.~.~.~.~.~.~.~ Chalcogen bonded directly to the ring carbon para to the ring oxygen (e.g., chromones, etc.) {2}
402  DF  .~.~.~.~.~.~.~>.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring
403  DF  .~.~.~.~.~.~.~>.~.~ Benzene ring bonded directly to the hetero ring (e.g., flavones, etc.)

DEFINITION

Classification: 549/401

(under subclass 399) Compounds in which chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is bonded directly to the ring carbon in the position which is para to the ring oxygen.

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