Germylenes and stannylenes based on aminobisphenolate ligands: insertion into the C—Br bond

A reaction of previously synthesized germylenes and stannylenes based on aminobisphenols RN{CH2[(5-R´)(3-But)C6H2(2-O—)]}2MII, M = Ge, R = CH2(2-Py), R´ = But (1); M = Ge, R = Et, R´ = Me (2); M = Sn, R = CH2(2-Py), R´ = But (3); M = Sn, R = Et, R´ = Me (4), containing (tetrylenes 1 and 3) or not containing (tetrylenes 2 and 4) a group capable of additional donation, with allyl bromide leads to the products of the insertion of tetrylenes into the C—Br bond: RN{CH2[(5-R´)(3-But)C6H2(2-O—)]}2M(Br)All, M = Ge, R = CH2(2-Py), R´ = But (5); M = Ge, R = Et, R´ = Me (6); M = Sn, R = CH2(2-Py), R´ = But (7); M = Sn, R = Et, R´ = Me (8). The structures of obtained derivatives were confirmed by NMR spectroscopy and elemental analysis. The structures of compounds 4, 5, and 7 were studied by X-ray crystallography. Stannylene 4 was found to be monomeric in the solid phase: the coordination number of the Sn atom is 3. The insertion products 5 and 7 are characterized by the coordination number 6 for the central atom.