B-t-butyl-borazine und -diazadiboretidine

Steuer, Holger-A.; Meller, A.; Elter, G.

doi:10.1016/0022-328x(85)88065-7

Cited by 23 publications

(13 citation statements)

References 10 publications

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“…The thermal conversion of Dewar borazines has also been investigated and revealed that the conversion of III-BN1, III-BN3, and III-BN4 into the corresponding dimer (RBNR') 2 proceeded at 160-300°C (Scheme 29). [69,[72][73] The reported 11 B NMR chemical shifts of Dewar borazines at room temperature appear around δ = 30 ppm, which are not in line with the value expected from the structure ( Table 7). Low temperature 11 B NMR measurements of III-BN3 or III-BN6/III-BN6' revealed that two peaks correspond to the expected Dewar borazine structure (δ = 35.9 ppm and 13.1 ppm or δ = 22.6 ppm and 33.4 ppm, respectively).…”

Section: Group 13/15mentioning

confidence: 78%

“…In 1985, the Eleter group reported the formation of a Dewar borazine III-BN3 from borazine. [72] The substitution reaction of borazine (FBNiPr) 3 with tBuLi, afforded the tBu-substituted Dewar borazine III-BN3 (Scheme 25). Employment of the bulky substituent results in the formation of Dewar borazine, which is thermally more favorable than the corresponding borazine.…”

Section: Group 13/15mentioning

confidence: 99%

“…Low temperature 11 B NMR measurements of III-BN3 or III-BN6/III-BN6' revealed that two peaks correspond to the expected Dewar borazine structure (δ = 35.9 ppm and 13.1 ppm or δ = 22.6 ppm and 33.4 ppm, respectively). [72,75] solution at room temperature (Scheme 30), with the corresponding borazine as the transition state.…”

Section: Group 13/15mentioning

confidence: 99%

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Inorganic Benzene Valence Isomers

Ota

Kinjo

2020

Chemistry An Asian Journal

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It has been computationally proposed that there are more than 200 possible isomeric structures for the C6H6 molecule, among which benzene (CH)6 represents the most thermodynamically stable molecule and its chemistry has been extensively developed. Three benzene valence isomers (CR)6, namely, prismane, Dewar benzene, and benzvalene, have also been synthesized to date. Incorporation of heteroatoms in the skeletal frameworks allows access to inorganic analogues of benzene and its valence isomers, which have attracted considerable attention due to their peculiar structural and electronic features. Experimentally, more than 30 examples of inorganic benzene and its valence isomers have been developed and characterized so far. In this contribution, their synthesis and characterization, as well as their stability and chemical properties, are discussed.

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Section: Group 13/15mentioning

confidence: 78%

Section: Group 13/15mentioning

confidence: 99%

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Inorganic Benzene Valence Isomers

Ota

Kinjo

2020

Chemistry An Asian Journal

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“…(411. Die Reaktion nach G1. (4) iPr/CH2Ph iBu/CH,Ph 6, 14.7, 14.6, 13.7, 14.9, 14.0, 15.5 (4b, 1, 26.4, 26.8, 25.0 (4b, 7, 141.4, 145.8, 146.8 (iC), 127.9, 127.5, 127.3, 128.5 (oC), 128.1, 128.1, 128.2, 127.5 (m-C), 126.4, 126.2, 124.5, 126.2 (p-C (2) 925 (2) (14) 223 (13) 268 (14) 309 (15) 321 (15) 310 ( 15) 249 ( 14) 269 (14) 376 (16) / 260 (14) 201 ( 12) 281 (14) 322 (15) 301 (15) 267 (14) 229 (13) 293 (15) 351( 15) / 242 (14) 213 ( 13) 288 (14) 372 (16) 366 (16) 369 (16) 289 (14) 243 (14) 308 (14) ( 2) 8234 (2,) 6954 (2) 9093 (2) 9377 (3) 2034 ( 3) 7916 ( 2) 9439 (2) 9842 (2) 8772 (2) 8270 ( 3) 7332 (3) 6901 (3) 7406 (3) 8333 (3) 10622 ( 2) 10659 ( 3 ) 11845 (2) 8075 ( 3) 7864 …”

Section: Umsetzung Von Diazadiboretidinen Rnit Azidenmentioning

confidence: 99%

BN‐Achtringe (RBNR')₄ aus BN‐Vierringen (RBNtBu)₂ durch NtBu/NR'‐Austausch

et al. 1991

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Eight-Membered BN Rings (RBNR')* from Four-Membered BN Rings (RBNtBu), by an Exchange NtBuINR'Reactions of the four-membered BN ring compounds PhCH2, iPr/Pr, iBu/Pr, iPr/iBu, iBu/iBu, Et/Ph, iBu/Ph) are (RBNtBu), ( l a -e : R = Me, Et, iPr, iBu, Pr) with azides formed, respectively. The NMR spectra reveal diastereotopic R'N3 (R' = PhCH2, Pr, iBu, Ph) and with the nitrone methylene protons (Et, Pr, iBu, PhCH2) and methyl groups (iPr, PhHC=N(Me)-0 are studied. The five-membered ring iBu) and thus elucidate the tub-like structure of the eight- (2a) is formed from membered rings. 3a and 4a crystallize in the space group the four-membered ring l a and PhCH,N3 in the ratio 1:2. An P2*/c. The reaction of the four-membered rings l c -e with exchange of NtBu for NR' with elimination of tBuN, is ob-the nitrone gives five-membered rings [-(R)B=N(tBu)= served, however, in the reaction of the ring compounds 1 b -d B(R)=N(Me) -0-1 (5 c -e), Both of the reactions of the fourwith RN3. Instead of four-membered BN rings, the six-mem-membered rings with azides and with the nitrone can be rabered BN ring (RBNR'), (3a: R/R' = Et/PhCH,) and the eight-tionalized in terms of a similar sequence of reaction steps. membered BN rings (RBNR')4 (4a-h: R / R = iPr/PhCH2, iBu/ Die Diazadiboretidine (RBNR')* (1) und die isoelektronischen Cyclobutadiene (RCCR')2 vom ,,Push-pull"-Typ (also solche mit elektronenziehenden bzw. -druckenden Gruppen R und R') haben dieselbe rhombisch-planare

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“…Beside the common six-membered cyclic systems, also boronnitrogen compounds with four-and eight-membered rings are known [10 -19]. Typically, cyclic representatives form during cyclization of aminoboranes or iminoboranes [10, 11, 20 -22], whereas the ring size depends mainly on the space requirement of the substituents [23,24]. Molecules like dichloroboryldisilylamines [SiCl m (CH 3 ) 3−m ]N[Si(CH 3 ) 3 ](BCl 2 ) (m = 0 [21,25,26], 1, 2 [9] and 3 [8]) are converted at elevated temperatures by silazane cleavage into six-membered borazine derivatives [(SiCl m (CH 3 ) 3−m )-NB(Cl n (CH 3 ) 1−n )] 3 (m = 0, n = 1 [21,25,26]; m = 1, n = 0.185 [9]; m = 2, n = 0.111 [9]; m = 3, n = 0.366 [8]).…”

Section: Introductionmentioning

confidence: 99%

Pyridine-promoted Cyclization of Functionalized N-Silylated Boron-Nitrogen Compounds

Schurz

Jansen

2011

Zeitschrift Für Naturforschung B

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Dichloroboryldisilylamines [SiCl m (CH 3 ) 3−m ]N[Si(CH 3 ) 3 ](BCl 2 ) (m = 1 -3) as well as chloromethylboryl-bis-(chlorodimethylsilyl)amine [SiCl(CH 3 ) 2 ] 2 N[BCl(CH 3 )] form 1 : 1 adducts with pyridine (1 -4). Those with m = 2 and 3 have been converted into functionalized diazadiboretidine derivatives which are still coordinated by pyridine: [(SiCl m (CH 3 ) 3−m )NBCl · Py] 2 (5: m = 2, 6: m = 3). Single-crystal X-ray diffraction structure analyses confirm the presence of planar, rhombusshaped, four-membered boron-nitrogen rings with tetra-coordinated boron atoms and nitrogenbonded, chlorine-functionalized silyl groups, for both compounds.

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B-t-butyl-borazine und -diazadiboretidine

Cited by 23 publications

References 10 publications

Inorganic Benzene Valence Isomers

Inorganic Benzene Valence Isomers

BN‐Achtringe (RBNR')₄ aus BN‐Vierringen (RBNtBu)₂ durch NtBu/NR'‐Austausch

Pyridine-promoted Cyclization of Functionalized N-Silylated Boron-Nitrogen Compounds

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B-t-butyl-borazine und -diazadiboretidine

Cited by 23 publications

References 10 publications

Inorganic Benzene Valence Isomers

Inorganic Benzene Valence Isomers

BN‐Achtringe (RBNR')4 aus BN‐Vierringen (RBNtBu)2 durch NtBu/NR'‐Austausch

Pyridine-promoted Cyclization of Functionalized N-Silylated Boron-Nitrogen Compounds

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BN‐Achtringe (RBNR')₄ aus BN‐Vierringen (RBNtBu)₂ durch NtBu/NR'‐Austausch