Abstract
The synthesis and structural characterization of representative and novel pyrazagaboles, boron- and gallium-containing compounds with a central six-membered heterocyclic B—(N—N)2—Ga ring feature, are detailed. Crystals of dimethylgallium-bis(μ-pyrazolyl)dimethylboron are orthorhombic, a = 7.6135(5), b = 16.2917(5), c = 22.331(1) Å, Z = 8, space group Pbca, and those of hydroxy(methyl)galliumbis(μ-pyrazolyl)dimethylboron are orthorhombic, a = 7.6197(3), b = 16.2184(7), c = 22.190(1) Å, Z = 8, space group Pbca. Both structures were solved by conventional heavy atom methods and were refined by full-matrix least-squares procedures to R = 0.054 and 0.040 for 1243 and 1272 reflections with I ≥ 1.5 and 3σ(I), respectively. The crystal structures are isomorphous and both feature six-membered B—(N—N)2—Ga rings having highly asymmetric boat conformations, unlike those observed for the majority of the homobinuclear analogs previously reported. The mean Ga—N and B—N distances in the two compounds are 1.977 and 1.61 Å. Keywords: pyrazagaboles, pyrazolyl-bridged heterocycles, crystal structures, synthesis of pyrazagaboles.
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