US PATENT SUBCLASS 549 / 209
.~.~.~.~ The metal is bonded directly to carbon, which carbon is a ring carbon of the hetero ring or which carbon is attached directly or indirectly to the hetero ring by nonionic bonding

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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}
206  DF  .~.~.~ Heavy metal or aluminum containing {5}
209.~.~.~.~ The metal is bonded directly to carbon, which carbon is a ring carbon of the hetero ring or which carbon is attached directly or indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 549/209

(under subclass 206) Compounds wherein the metal is bonded directly to (1) a ring carbon of the oxygen-containing hetero ring, or (2) a carbon atom which additionally is attached directly or indirectly to the oxygen-containing hetero ring by nonionic bonding.

(1) Note. Excluded from this subclass are compounds such as: [figure]

which require "doubling back" through the metal to satisfy the conditions necessary for inclusion here.

(2) Note. Examples of compounds provided for herein are: [figure] [figure]