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Title: Synthesis of phthalides and related topics and the isomerisation of a homophthalic acid derivative
Author: Allison, William R.
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1960
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(a) The scope of the photobromination technique as a synthetic route to phthalide derivatives is discussed. The yields by this route have been improved by a new method for hydrolysis of orthobromethyl esters to the corresponding bromophthalides. Thus ethyl dibromo-orsellinate has been converted into 5,7-dihydroxyphthalide, and ethyl everninate has been converted into 7-hydroxy-5-methoxyphthalide. The relatively weak nature of the intramolecular hydrogen bond in 7-hydroxyphthalides has been further confirmed. (b) A proposed synthesis of 7-methoxybenzo[1',2',5,6] phthalide using the above methods, required l-hydroxy-3-methyl-2-naphthoic acid as starting material. On repeating the literature method for preparation of the latter, a new compound was obtained, which has been identified as 2-carboxy-3-methyl-4-phenyl-3-butenoic acid. A mechanism has been proposed for its formation.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available