US PATENT SUBCLASS 562 / 482
.~.~.~.~ Preparation by isomerization

Current as of: June, 1999
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562 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {41}
400  DF  .~ Carboxylic acids and salts thereof {14}
405  DF  .~.~ Aromatic {13}
480  DF  .~.~.~ Polycarboxylic acids or salts thereof {7}
482.~.~.~.~ Preparation by isomerization

DEFINITION

Classification: 562/482

Preparation by isomerization:

(under subclass 480) Processes wherein the acid is produced by isomerization, as for example, in the Henkel Rearrangement Reaction wherein phthalic acid is isomerized to terephthalic acid.