US PATENT SUBCLASS 549 / 258
.~.~.~.~.~.~ Of acyclic or alicyclic hydrocarbon

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}
231  DF  .~.~.~ Cyclic anhydrides (i.e., -C(=X)OC(=X)-, wherein the X's are the same or diverse chalcogens, is part of the hetero ring) {2}
233  DF  .~.~.~.~ The cyclic anhydride is five-membered (e.g., succinic anhydride, etc.) {7}
256  DF  .~.~.~.~.~ Preparing by oxidation {2}
258.~.~.~.~.~.~ Of acyclic or alicyclic hydrocarbon {1}
259  DF  .~.~.~.~.~.~.~> Vanadium and phosphorus, in compound or elemental form, utilized {1}

DEFINITION

Classification: 549/258

(under subclass 256) Processes wherein the oxidation reaction is performed on an acyclic or alicyclic hydrocarbon.

(1) Note. Examples of processes provided for herein are: oxidation of butane to maleic anhydride, oxidation of butene to maleic anhydride, and oxidation of isoprene to citraconic acid anhydride.