Reactions between Boron and Magnesium Halides and the Bicyclic Guanidine hppH (1,3,4,6,7,8-Hexahydro-2H-pyrimido[1,2-a]pyrimidine): Guanidinates with New Structural Motifs

Herein we report on the synthesis and chemical properties of some binuclear and oligonuclear compounds of boron- and magnesium-containing bridging guanidinate ligands. These species were prepared by reaction of the bicyclic guanidine hppH (hppH = 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine) and BCl3, the diborane(4) B2Cl2(NMe2)(2) or the Grignard compound MeMgBr. The experimental results are complemented by quantum chemical (DFT) calculations.