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The bis(diorganoboryl) chalcogenides (R2B)2O [R = C2H5 (3); R2 = 1,5‐C8H14 (1)], (R2B)2S [R2 = 1,5‐C8H14 (5)], and (R2B)2Se [R2 = 1,5‐C8H14 (7)] react with pyrazole (Pz) and its derivatives 3‐methylpyrazole (3‐MePz) and indazole (benzo‐Pz) to form in high yields (65–92%) stable 1:1 adducts [e.g. 2 (El = O), 4 (El = O), 6 (El = S) and 8 (El = Se)]. 1H‐, 13C‐, 11B‐NMR spectra and X‐ray analyses (of 2 and 6) show a basic structure with a central B2ElN2 (El = O, S, Se) heterocycle. The reaction of 2 with R2BH and the thermolysis of 4 give the dimeric 1‐pyrazolylboranes 9a and 9b, respectively.
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Yalpani et al. (1989) studied this question.
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