Aluminum compounds Claisen rearrangement

Ether groups in the benzene ring of quinazoline behave as in ethers of homocyclic aromatic compounds, e.g., they can be demethylated with anhydrous aluminum chloride. Allyl ethers also undergo a Claisen rearrangement/ ... 

The title compounds also undergo the Claisen rarrangement (5-allyloxypyrazoles 4-allyl-5-pyrazolones) and are readily transformed into 5-chloropyrazoles by means of phosphorus oxychloride (8OCHE1). In the presence of aluminum chloride 5-acyloxypyrazoles (481) undergo the Fries rearrangement affording 4-acyl-5-hydroxypyrazoles (482). 

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