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Titolo:
DERIVATIVES OF AZA-NIDO-TETRABORANE AND DIAZA-ARACHNO-PENTABORANE FROM TRI-TERT-BUTYLAZADIBORIRIDINE
Autore:
MULLER M; WAGNER T; ENGLERT U; PAETZOLD P;
Indirizzi:
TH AACHEN,INST ANORGAN CHEM D-52056 AACHEN GERMANY TH AACHEN,INST ANORGAN CHEM D-52056 AACHEN GERMANY
Titolo Testata:
Chemische Berichte
fascicolo: 1, volume: 128, anno: 1995,
pagine: 1 - 9
SICI:
0009-2940(1995)128:1<1:DOAADF>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
LITHIUM ALUMINUM-HYDRIDE; ALKALI-METAL HYDRIDES; QUANTITATIVE SYNTHESIS; ADDITION-COMPOUNDS; RAPID REACTION; CONVENIENT; DIALKYLBOROHYDRIDES; TRIALKYLBORANES; HYDROBORATION; ORGANOBORANES;
Keywords:
1-AZA-NIDO-TETRABORANES; 2,5-DIAZA-ARACHNO-PENTABORANES; 2,5-DIAZA-NIDO-HEXABORANES; BORYL[DIBORANE(4)YL]AMINE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
M. Muller et al., "DERIVATIVES OF AZA-NIDO-TETRABORANE AND DIAZA-ARACHNO-PENTABORANE FROM TRI-TERT-BUTYLAZADIBORIRIDINE", Chemische Berichte, 128(1), 1995, pp. 1-9

Abstract

The Lewis acids RBH2 are added to the basis B-B bond of tri-tert-butylazadiboriridine, NB2tBu3 (1a), to give alkyl-1,2,3-tri-tert-butyl-1-aza-nido-tetraboranes of type 3 (two endo-H atoms at B5) or type 4 (oneH atom in a B2-B5 bridging position, one exo-H atom at B5), either asa mixture of 3 and 4 (3, 4b-d: R = Me, tBu, CMe2iPr) or with the isomer 4 in high excess (4e, f: R = Ph, sBu). The reaction of dialkylboranes R2BH with 1a yields alkyl-1,2,3-tri-tert-butyl-1-aza-nido-tetraboranes of type 4 (one H atom in a B2-B5 bridging position; 4g, h: R2 = Et2, cycloocta-1,5-diyl). In boiling THF, trialkylboranes BR3 transform 1a into NB2tBu2R which, expectedly, dimerizes spontaneously to give a dialkyl-tetra-tert-butyl-2,5-diaza-nido-hexaborane of type 2 (2a, b: R= Me, Et). The products of the addition of aminoboranes H2B=NRR' to 1a are identified as alkyl derivatives of 2,5-diaza-arachno-pentaborane, N2B3H2tBu3RR' (5a-d, R/R' = H/Pr, H/tBu, Me/Me, Et/Et). The aminoborane H2B=NiPr2 with a sterically more demanding amino group hydroborates the B-B bond of 1a to give the acyclic product iPr2N=BH-B(tBu)-N(tBu)=B(tBu)H (6). In contrast to the B atoms, the N atoms in the electron-deficient cluster skeletons of 2-5 need not take part in (3c, 2e) bonds of the sigma type. The molecular structures of 4c, 5d, and 6 are confirmed by X-ray structural analyses.

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Documento generato il 24/09/20 alle ore 06:24:42