'P(NiPr3 (9, warend sich rnit Li2EPh (E = P, As) aus 2a, c Vier- with A = B(NiPr2) (3), SiR2 (4a, b), P(NiPr)2 (5), whereas the dechlorination of 24, c with Li2EPh (E = P, As) yields the four-membered ring products
[-B(NiPr2)"(tBu)-A-Ei(Ph)-]with A = B(NiPrz) (6, 7), SiMe2 (8, 9). Dichiorides AC12 are added to the iminoborane Me,Si(tBu)N-B=NtBu Chem.