US PATENT SUBCLASS 585 / 643
.~ By alkyl transfer, e.g., disproportionation, etc.

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

500  DF  UNSATURATED COMPOUND SYNTHESIS {14}
643.~ By alkyl transfer, e.g., disproportionation, etc. {4}
644  DF  .~.~> Plural stage or averaging
645  DF  .~.~> Using organic extraneous agent
646  DF  .~.~> Using catalyst containing Mo, Re, or W and another transition metal
647  DF  .~.~> Using Re-containing catalyst

DEFINITION

Classification: 585/643

By alkyl transfer, e.g., disproportionation, etc.:

(under subclass 500) Subject matter in which an alkyl or alkenyl moiety of a molecule is transferred to another molecule.

(1) Note. Patents are classified herein on the basis of the net result of the process, regardless of the mechanism involved, that is, the process may proceed by dimerization and cracking, as well as by free-radical transfer.

SEE OR SEARCH THIS CLASS, SUBCLASS:

368, 433, 440, 616, and 656, for disproportionation reactions involving the transfer of hydrogen between hydrocarbon molecules or hydrocarbyl moieties.

446+, and 709+, for the condensation of two entire molecules or hydrocarbyl moieties to give an alkylated product.

477, 671 and 734, for a process wherein an alkyl attached to one carbon of a molecule is shifted to another carbon of the same molecule.

470+, and 708, for alkyl or alkenyl transfer processes resulting in aromatic and saturated products, respectively.