“…This aliquot was also stored at 4 °C. After removal of solvent, the spectra of the aliquot and the main reaction mixture (230 mg crude; 20-25% material loss during photolysis) both revealed the same new product, trans-2methoxycyclohex-3-ene-l-carboxylic acid (7), formed from opening of the ß-lactone: IR 3500-2500 (s), 1710 (s, br), 1644 (w), 1095 (m, br) cm-1; NMR 1.43-2.83 (m), 3.30 (s, 3 ), 4.0 (m), 5.70 (s with fine structure, 2 H), 9.70 (br s, 1 H; variable).…”