Terephthalic Acid → 4-Formylbenzoic acid

HRID 414382

Reaction equation

[C:1](O)(=[O:11])[C:2]1[CH:10]=[CH:9][C:5]([C:6]([OH:8])=[O:7])=[CH:4][CH:3]=1.[Pd:13].[N+]([O-])([O-])=O.[Pd+2].[N+]([O-])([O-])=O>>[C:6]([C:5]1[CH:9]=[CH:10][C:2]([CH:1]=[O:11])=[CH:3][CH:4]=1)([OH:8])=[O:7].[Pd:13]

Participants

Reactant 3

HCID 7489Terephthalic Acid

HCID 23938Palladium

HCID 24932Palladium nitrate

Product 2

HCID 120884-Formylbenzoic acid

HCID 23938Palladium

Procedure

For reasons which are not understood, it has been found that hydrogenation of crude terephthalic acid with a catalyst comprising palladium deposited upon and reacted with a porous activated carbonaceous support from an organic solution of palladium nitrate gives a better reduction of 4-carboxybenzaldehyde (4-CBA) with decreasing palladium content of the catalyst in the 0.1 (wt)% to 0.6 (wt)% range. Preferably, the catalyst should have less than 0.3 (wt)% palladium content. This is also an economic advantage because less palladium is needed.

Sources & evidence

ORD record: ord-f7a7eeec282246948a7c3e600ae0aab5
Source dataset: uspto-grants-1988_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04791226

Linked notes

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