1990
DOI: 10.1016/0022-328x(90)85258-z
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Pentacoordinated silicon compounds. Intramolecular ring closure, site preferences of substituents and the stability of the resulting chelates

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Cited by 54 publications
(41 citation statements)
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“…Bekannt sind bereits die Verbindungen 1 a [35], 1 c und 1 d [26]. Sie wurden bisher nur durch ihre massen-sowie 1 H-NMR-spektroskopischen Daten charakterisiert und auûer 1 c auf anderem Wege dargestellt.…”
Section: Chlorsilane 1 A±1 Dunclassified
“…Bekannt sind bereits die Verbindungen 1 a [35], 1 c und 1 d [26]. Sie wurden bisher nur durch ihre massen-sowie 1 H-NMR-spektroskopischen Daten charakterisiert und auûer 1 c auf anderem Wege dargestellt.…”
Section: Chlorsilane 1 A±1 Dunclassified
“…In order to exclude the influence of hydrogen bonding in the resonances of benzylic protons, 1,3-bis(trimethylsiloxy)-1,3-bis[(2-dimethylaminomethyl)phenyl]-1,3-divinyldisiloxane (2) in the absence of hydroxyl groups [18] was synthesized quantitatively by the reaction of rac-1 with 2 equiv of trimethylchlorosilane in the presence of excess triethylamine in diethyl ether solvent. The 1 H NMR of CH 2 N of 2 resulted in a typical pattern, showing that Dd of 2 was decreased as the temperature increased [14][15][16][17], (Fig. 3) which was different from those of Fig.…”
Section: Resultsmentioning
confidence: 88%
“…The resonances of CH 2 N of rac-1 were broad at 243 K, but were spilt at 258 K and higher as doublet-doublet patterns due to geminal couplings, which is an unexpected phenomenon. In general, the resonances of benzylic protons collapsed as the temperature increased due to the thermodynamic reasons [14][15][16][17]. To understand the unexpected phenomenon we assumed that a hydrogen bonding may play an important role in the resonances of benzylic protons.…”
Section: Resultsmentioning
confidence: 99%
“…The gauche conformer which is calculated to be 5.6 kJ mol −1 more stable than the anti conformer shows a slightly stronger interaction between the acceptor and the donor function as indicated by an SiNN angle of 101.9 • and an Si··· N distance of 2.421Å. It remains unclear whether this is due to a higher apicophilicity [16] of the chlorine substituents or to differences in the repulsion between the CF 3 and Cl groups on one and the methyl groups at nitrogen on the other side. Interestingly, the gauche conformation of 1 shows an even stronger interaction between Si and N2 than that found in the crystal structure of F 3 SiN(Me)NMe 2 (XRD:…”
Section: Quantum Chemical Calculationsmentioning
confidence: 98%