H(tert-butyl)PCH2P(tert-butyl)2

3,5-dichloro-1-methyl-1,2,3,5-diazadiphospholidine

二(膦基)甲烷

dichloro-(dichlorophosphanylmethyl)-sulfanylidene-λ⁵-phosphane

dichloro(dichlorophosphorylmethyl)phosphane