1,2,4,5-tetra-tert-butyl-3,3,6,6-tetraphenyl-1,2,4,5-tetraphospha-3,6-digerma-cyclohexane

1,2,3,4-tetra-tert-butyl-5,5-diphenyl-1,2,3,4-tetraphospha-5-germa-cyclopentane

tert-butyl(tert-butylphosphanyl)phosphane,diethylgermanium

tert-butyl-bis(tert-butylphosphanyl)phosphane,diethylgermanium

tert-butyl(tert-butylphosphanyl)phosphane,ditert-butyltin