Summary The title compounds have been prepared by heating black selenium powder with the amine in the presence of red lead ; their X-ray crystal structures have been determined. ... WHEREAS di- and poly-sulphur diamides are well kn ~ wn , l - ~ the only example of a selenium analogue appears to be a brick-red solid of mp 90-95 "C described as being essen- tially dimorpholinotriselane.6 Levi2 in 193 1 prepared dipiperidino-tri- and -tetra- sulphane ...
