Synthesis and Characterization of Organoboryl Germanium(II) Oxides Containing Ge-O-B and Ge-O-B-O-Ge Cores

Organoboryl germanium(II) oxides were synthesized from the 1,4-addition reaction of L'Ge (L' = HC[C(CH2)N(Ar)]C(Me)N(Ar), Ar = 2,6-iPr(2)C(6)H(3)) with selected monosubstituted arylboronic acids RB(OH)(2) (R = 2,6-Me2C6H3,2,4,6-Me3C6H2, 1-Naph) at the molar ratioss of 1:1 and 2:1. The mononuclear productss RB(OH)OGeLRB(OH)OGeL (L=CH[C(Me)N(Ar)](2), Ar = 2,6-iPr(2)C(6)H(3); R = 2,6-Me2C6H3 (1), 2,4,6-Me3C6H2 (2), 1-Naph (3)) containing the Ge-O-B core were obtained smoothly through the 1:1 reaction. However, the reaction of L'Ge with 2,6-Me2C6H3B(OH)(2) in a 2:1 ratio gave only the mononuclear product (1) instead of the expected binuclear one. What's more, a new borate compound [(2,6-Me2C6H3)(4)B5O6](-)[H:C](+)(4)(:C=C[N(iPr)C(Me)](2)) was concomitantly formed when the in situ prepared L'Ge was used as the precursor In contrast, the use of 2,4,6-Me3C6H2B(OH)(2) or 1-NaphB(OH)(2) as the organoboryl source in the similar reaction led to the formation and isolation of the binuclear products RB(OGeL)(2) (R = 2,4,6-Me3C6H2 (5), 1-Naph (6)) containing the Ge-O-B-O-Ge core in a straight way. Compounds 1 similar to 6 were determined by single-crystal X-ray diffraction analysis.

Automated summary

Organoboryl germanium(II) oxides were synthesized through 1,4-addition reaction, resulting in products containing the Ge-O-B core. The composition and morphology of the products may vary under different reaction conditions.