Acetaldehyde → 1,1-Bis(3,4-dimethylphenyl)ethane

HRID 46435Notes

Reaction equation

[CH:1](=O)[CH3:2].[C:4]1([CH3:11])[C:5]([CH3:10])=[CH:6][CH:7]=[CH:8][CH:9]=1>>[CH3:11][C:4]1[CH:9]=[C:8]([CH:4]([C:5]2[CH:6]=[CH:7][C:8]([CH3:9])=[C:1]([CH3:2])[CH:10]=2)[CH3:11])[CH:7]=[CH:6][C:5]=1[CH3:10]

Participants

Reactant 2

HCID 177Acetaldehyde

HCID 7237O-Xylene

Product 1

HCID 744481,1-Bis(3,4-dimethylphenyl)ethane

Procedure

A process for preparing 3,4,3',4'-benzophenonetetracarboxylic dianhydride which comprises condensing an impure ortho-xylene mixture with acetaldehyde in contact with an acid catalyst to obtain an impure 1,1-bis(3,4-dimethylphenyl)ethane mixture, oxidizing the 1,1-bis(3,4-dimethylphenyl)ethane mixture with nitric acid to obtain a mixture of carboxylic acids, from which by crystallization and dehydration substantially pure 3,4,3',4'-benzophenonetetracarboxylic dianhydride is recovered.

Sources & evidence

ORD record: ord-de129791e72e47889aef63f1417ef6ea
Source dataset: uspto-grants-1979_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04173573

Reaction notes

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