Cobalt(II) diacetylmonoxime complex-catalysed oxidative coupling reactions of few aromatic compounds
✍ Scribed by A. Puzari; J.B. Baruah
- Book ID
- 104424678
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 125 KB
- Volume
- 153
- Category
- Article
- ISSN
- 1381-1169
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✦ Synopsis
Ž .
w x Catalytic amount of a diacetylmonoxime cobalt II chloride complex A along with hydrogen peroxide reacts with toluene to give benzylalcohol, benzaldehyde and trace amount of p-cresol and o-cresol. Similar catalytic reaction of aniline gives C-N-bonded oligomer having M and M of 1256 and 1892, respectively. Mass spectra determined by MALDI n w
suggests the polyaniline to have highest mass from 14 units of aniline with CoCl unit attached at the end. The oligomer 2 Ž . Ž . thus formed have semiconducting properties. Similar reaction of phenol with cobalt II diacetylmonoxime Co-DAM w x complex in the presence of hydrogen peroxide gives C-O-bonded polyphenol. The reaction of 2-aminophenol with A and hydrogen peroxide leads to aggregate that has property of irreversible thermoelectric sensor. ESR suggests this property to originate from free radical present in the aggregate. Substituted aniline such as 2,4-dimethoxyaniline can also form low molecular aggregate from similar reaction that has semiconducting property in the range of 358C-1808C.