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A mixture of 9.55 g of phosphorus pentasulfide and 9.5 g of potassium sulfide were ground together and added to a solution of 20.2 g (0.07 mole) of 2-(2-chloroethyl)-2,3-dihydro-4-methylnaphth[2,1-f][1,4]oxazepin-5(4H)-one in 200 ml of dry toluene. The mixture was stirred and heated at reflux for 7 hr. The hot reaction mixture was filtered and the product crystallized from the cooled filtrate. Recrystallization from chloroform gave 18 g (84%) of yellow crystals, m.p. 167°-170° C.

1. temperatureheated
2. temperatureat reflux for 7 hr
3. filtrationThe hot reaction mixture was filtered
4. customthe product crystallized from the cooled filtrate
5. customRecrystallization from chloroform