A Convenient Synthesis of 3-Substituted-5, 5-dimethyl-tetrahydro-2-benzopyran-8-ones Through Hetero-Diels-Alder Reaction

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• 1H and 13C NMR spectra were recorded at 300 MHz and 75.4MHz respectively with Varian XL-300 in CDC13 using TMS as internal standard, J values are given in Hz. Mass spectra were recorded with Shimadzu GC MS-QP 1000 spectrometer at 70 ev. IR spectra were recorded with a Perkin Elmer 681 spectrometer. The microanalysis was done on Carlo Erba Strumentazione 1106 elemental analyser
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