fication. The concentration of aryl vinyl ethers was about 5 X 6 M. For low-temperature experiments the cooling technique of Fischer13 was applied.Steady Irradiations. Solutions (5 X 10"3 M) of aryl vinyl ethers in MCH, n-hexane, or methanol/acetic acid/benzene (1:1:1) were irradiated in an apparatus described elsewhere.7 The irradiations were continued until constancy of the UV spectra indicated the end of the reaction. Then the solvents were evaporated and the products analyzed by NMR, mass, and IR spectroscopy.Instruments: Beckman Acta VII UV-spectrophotometer, Varían EM 360 A (60 MHz) and Brucker-Spectrospin WH-400 (13) Fischer, E. Mol. Photochem. 1970, 2, 99-102. (400 MHz) NMR spectrometers, Varían MAT 112 mass spectrometer.
3,4-dihydro-2(1H)-quinazolinone Derivatives. -Compound (IX) exhibits the highest activity and shows potential for generating a novel class of highly potent Na + /Ca 2+ exchanger inhibitors (no yields given). -(HASEGAWA*, H.; MURAOKA, M.; MATSUI, K.; KOJIMA, A.; Bioorg. Med.
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