Degradation of aromatic ring

Another enzyme of the mandelate pathway of degradation of aromatic rings (Fig. 25-8) is the cis,cis-muconate lactonizing enzyme which catalyzes the reaction of Eq. 13-23. It has a three-dimensional struc-... 

G Gellerstedt and E-L Pettersson. Light-Induced Oxidation of Lignin. Part 2. The Oxidative Degradation of Aromatic Rings. Svensk Papperstn 80(1) 15-21, 1978. 

Clayden (2002) plan for (-)-kainic acid oxidative degradation of aromatic ring leaving one carbon atom as a carboxylic acid (step 7) cyclohexanone top ring is made in step 3, ring expanded by Baeyer-Villiger oxidation (step 9), and opened np in step 10. 

A technique based on ozonation, in contrast, provides information on the stmcture of the lignin side chain by degrading the aromatic rings (33). Thus the side chain of the dominant stmcture ia all native lignins, the arylglycerol—P-aryl ether moiety, can be obtained ia the form of erythronic and threonic acids. Ozonation proves to be an elegant method for determination of the stereospecificity ia lignin. 

Degradative oxidation of aromatic rings into carboxylic acids4b and oxidation of aromatic compounds to quinones2a... 

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