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- W2093770248 abstract "2-Boraindanes and 2-(Dialkylamino)1-2-benzoborole Dianions ortho1-Xylene reacts with the Lochmann-Schlosser base to produce a mixture of the potassium derivatives K2[1,2-C6H4(CH2)2] (2) and K[2-MeC6H4CH2] (3). Condensation of 1 + 2 with BCl2(NR2) (RMe, Et, iPr) affords 2-(dialkylamino)1-2-boraindanes (1a–c) (50%). Treatment of 1a, b with LiTMP/TMEDA in THF yields dilithio derivatives [Li(tmeda)]2[C6H4(CH)2BNR2] (8a, b) (40%) which show tripledecked structures consisting of an aromatic 10′-electron 2-benzoborole dianion and two [Li-(tmeda)]+ units facially bound to the borole ring. 1a reacts with HCl/Et2O/hexane to give C6H4(CH2)2BCl · OEt2 (1d · OEt2) (76%) which decomposes in vacuo to give the chloro derivative 1d. The methyl derivative C6H4(CH2)2BMe (1e) is obtained from 1a by treatment with LiMe/Et2O at –78°C and subsequently with HCl/Et2O at –78°C (41%). 1a, b react with MeOH at –78°C to give solid adducts C6H4(CH2)2BOMe · NHR2 (12a, b) while 1c affords C6H4(CH2)2BOMe (1f). Subsequent ring-opening produces 2-MeC6H4CH2B(OMe)2 (13). With the exception of 1b the 2-boraindanes 1 are crystalline solids. The silylation of the 2-benzoborole dianions and various (2-methylbenzyl)borane derivatives is also described." @default.
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- W2093770248 date "1993-06-01" @default.
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- W2093770248 title "2‐Boraindane und 2‐(Dialkylamino)1‐2‐benzoborol‐Dianionen" @default.
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