Pyrazole organoboranes. Part IV. Bicyclo[2.2.1]heptanes (B2N4Se) and bicyclo[2.2.2]octanes (B2N4Se2).
Dialkyl-1,2,4-triselena-3,5-diborolanes I (R = Et, Pr) react with pyrazole (pz), 3-methylpyrazole (mpz), and 3-phenylpyrazole (ppz) to yield the diselenabicyclo[2.2.2]octanes II (R = Et, Pr, R1 = H, Me, Ph, R2 = H). 3,5-Dimethyl- and 3,5-diphenylpyrazoles react with I to furnish the corresponding substituted monoselenabicyclo[2.2.1]heptanes III (R = Et, R1 = Me, Ph, R2 = Me, Ph). X-ray crystal structures of II (R = Et, R1 = R2 = H) and III (R = Et, R1 = R2 = Me) were obtained.
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