potassium hydroxide; hydrogen sulfide in ammonium hydroxide; ethanol
1.) H2S was added for 1 h, 0 deg C, 2.) standing overnight (in a stoppered flask);
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Paventi, Martino; Edward, John T.
Canadian Journal of Chemistry, 1987 , vol. 65, p. 282 - 289
Christian
Journal of Organic Chemistry, 1957 , vol. 22, p. 396
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Bucherer; Brandt
Journal fuer Praktische Chemie (Leipzig), 1934 , vol. <2> 140, p. 129,135, 150