Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Photolysis of 2-diazo-1,3-indandione leads to ketene formation via the Wolff rearrangement. Ketene 2 hydrates to produce enol 3a that rearranges to 4a. Homophthalic acid 5a is formed by photodecomposition of 4a upon prolonged irradiation. ... Photolysis of 2-diazo-1,3- ...