16103-91-6Relevant academic research and scientific papers
Chemical behavior and structure of triply bridged pyrazaboles of the type RB(μ-pz)2(μ-OBRO)BR
Hsu,Mariategui,Niedenzu,Shore
, p. 143 - 147 (2008/10/08)
Triply bridged pyrazaboles of the type RB(μ-pz)2(μ-OBRO)BR (1, R = C2H5, C6H5; Hpz = pyrazole) are thermally quite stable and can be sublimed without decomposition even under atmospheric pressure. At room temperature they are resistant to water but are not soluble. Dissolution of 1 in protonic solvents occurs with complete breakdown of the molecule. Halogenation of 1 (R = C2H5) with SOCl2 yields the pyrazabole RClB(μ-pz)2BRCl. The latter compound is a valuable material for the preparation of various other pyrazaboles. Thus, reaction with alkali-metal alkoxide or with alcohol in the presence of triethylamine gives access to R(R′O)B(μ-pz)2BR(OR′) (R′ = CH3, C2H5), the first examples of B-alkoxypyrazaboles; with (CX3CO)2O (X = H, F), the species with R′ = CX3CO are obtained. The crystal and molecular structures of 1 with R = C2H5 were determined. The molecule crystallizes in the monoclinic system in space group P21/c with a = 7.587 (2) A?, b = 12.415 (2) A?, c = 16.387 (3) A?, β = 90.50 (2)°, and Z = 4.
