- Organosubstituted 2,5-Dihydro-1,2,5-oxoniasilaboratoles - Characterization and Reactivity
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The potassium salt of the anions , prepared from the organosubstituted cis-2-boryl-1-silylalkenes 1a-d and KOH, react with the electrophiles R1Hal IV: ClElIV(CH3)3, ElIV = Si, Ge, Sn, Pb> to give the neutral five-membered ring compounds .On heating of 3H or 3Sn either ethyl migration occurs to yield the saturated diasteromers , or elimination of ethane takes place to give the unsaturated compounds .The reaction of 2 with ClPb(CH3)3 leads to 3Pb (11B-NMR), which exclusively form 5 with elimination of C2H5Pb(CH3)3.
- Koester, Roland,Seidel, Guenter,Wrackmeyer, Bernd
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p. 1003 - 1016
(2007/10/02)
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- Novel Substituted B2ElVIN2 Heterocycles
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The bis(diorganoboryl) chalcogenides (R2B)2O , (R2B)2S , and (R2B)2Se react with pyrazole (Pz) and its derivatives 3-methylpyrazole (3-MePz) and indazole (benzo-Pz) to form in high yields (65 - 92 percent) stable 1 : 1 adducts . 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. -Keywords: Bis(diorganoboryl)chalcogenides / Pyrazaboles / Pyrazoles
- Yalpani, Mohamed,Koester, Roland,Boese, Roland
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