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in press. (7) Methyl 2-hydroxyphenylacetate (12) cycllzed to 2-coumaranone (15) to varying extents during glc analysis. The yield reported for 12 has been corrected for this conversion.15 (8) In the Vycor-filtered reactions even at low conversions color developed in the reaction mixtures and a significant amount of the incident radiation was not being absorbed by the starting material. This situation prevented reliable quantum yield determinations. (9) A somewhat similar observation has been made by E. A. Caress and I. E.

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