ethanol; ammonia; water; lithium T=-33°C;

sodium hydrogen telluride in ethanol Ambient temperaturepH 10-11; Yields of byproduct given. Title compound not separated from byproducts;

trifluoroacetic acid in dichloromethane byproducts: 7-phenyl-2-oxa-bicyclo(4.1.0)heptane; Ar-atmosphere; addn. of 2 equiv. of pyridine derivative to W-complex soln. at -78°C, warming to 0°C, evapn., washing (cold hexane), dissoln. in CH2Cl2 at -78°C, addn. of excess of dihydropyrane and CF3COOH, warming to room temp.; evapn., chromy. (SiO2, petroleum ether/CH2Cl2=9:1);