US PATENT SUBCLASS 562 / 406
.~.~.~ Preparation by carbonylation

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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}
406.~.~.~ Preparation by carbonylation

DEFINITION

Classification: 562/406

Preparation by carbonylation:

(under subclass 405) Processes wherein an aromatic carboxylic acid is prepared through formation of a carboxyl group on an aromatic compound by reaction with carbon monoxide.