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A mixture of 21.3 g. (0.137 mole) of 12 and 20 g. (0.25 mole) of potassium hydrosulfide in 200 ml. of ethanol was refluxed for 2 hours and evaporated to dryness. The residue was dissolved in 100 ml. of water and filtered to remove a small amount of insoluble material. The filtrate was acidified to pH 1 with dil. hydrochloric acid to precipitate (13) as colorless needles which were collected by filtration, washed with 20 ml. of water and dried. Yield 9.80 g. (47%). M.p. 140°-141° C. (dec.).

1. additionA mixture of 21.3 g
2. customevaporated to dryness
3. dissolutionThe residue was dissolved in 100 ml
4. filtrationof water and filtered
5. customto remove a small amount of insoluble material
6. customto precipitate (13) as colorless needles which
7. filtrationwere collected by filtration
8. washwashed with 20 ml
9. dry with materialof water and dried