From 2,4-diphospha-3-thia- and -3-selenapentadienes [(Me3Si)2C=P]2E to heteronorbornane cage compounds. - du Mont WW; Gust T; Mahnke J; Birzoi RM; Barra L; Bugnariu D; Ruthe F; Wismach C; Jones PG; Karaghiosoff K; Nyulászi L; Benkõ Z (Angewandte Chemie (International ed. in English), 2007)