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Photolysis of sodium 2-diazo-l-oxo-l,2-dihydronaphthalene-5-sulfonate and 4-tert-butylphenylphenyl 2-diazo-1-oxo-1,2-dihydronaphthalene-5-sulfonate in aliphatic alcohols results in the formation of a high yield of the corresponding sodium 3-(alkoxycarbonyl)-1 H-indene-5-sulfonate and 4-tert-butylphenyl3-(alkoxycarbonyl)-1 Hindene-5-sulfonate, respectively. l-Hydroxy-2-alkoxynaphthalene-5-sulfonates are formed as side products in these photoreactions. The observed maximum molar yield of the latter products was 8.8%. Photolysis of a solution of sodium 2-diazo-1 -oxo-1,2-dihydronaphthalene-5-sulfonate in water yields, apart from the main photoproduct, sodium 3-carboxy-1 H-indene-5-sulfonate, approximately 15% of the sodium 1,2-dihydroxynaphthalene-5-sulfonate. Both the nature of the side products of the photoreaction, as well as their yield as a function of the concentration of alcohol and water in various solvent mixtures, are a strong indication for the presence of a carbene intermediate in