t-butylimino-2,4,6-tri-t-butylphenylborane

4-(2,4,6-tri-tert-butylphenyl)-1,3,2,2-tetramethyl-1,3-diaza-2-germa-4-boracyclobutane

4,8-bis(2,4,6-tri-tert-butylphenyl)-1,2,3,5,6,7-hexamethyl-1,3,5,7-tetraaza-2,6-dialumo-4,8-diboracyclooctane

4,8-bis(2,4,6-tri-tert-butylphenyl)-1,2,2,3,5,6,6,7-octamethyl-1,3,5,7-tetraaza-2,6-distanna-4,8-diboracyclooctane

2-tert-butyl-4-(2,4,6-tri-tert-butylphenyl)-1,3-dimethyl-1,3-diaza-2-phospha-4-boracyclobutane