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Description
| - 29Si-13C interakce byly změřeny v para substituovaných silylovaných fenolech, X-C6H4-O-SiR1R2R3 (X = NO2, CF3, Cl, F, H, CH3, CH3O). Jako SiR1R2R3 silyl byly použity trimethylsilyl (Si(CH3)3, TMS), tert-butyldimethylsilyl (Si(CH3)2C(CH3)3, TBDMS), dimethylsilyl (SiH(CH3)2, DMS) a tert-butyldiphenylsilyl (Si(C6H5)2C(CH3)3, TBDPS). Hodnoty interakcí závisí na substituentech na křemíku. Interakce přes dvě a tři vazby nazávisí na substituentech benzenového jádra. Interakce přes 4 a více vazeb jsou ovlivněny substituentem. (cs)
- 29Si-13C couplings were measured in para substituted silylated phenols, X-C6H4-O-SiR1R2R3 (X = NO2, CF3, Cl, F, H, CH3, CH3O). The SiR1R2R3 silyl groups included trimethylsilyl (Si(CH3)3, TMS), tert-butyldimethylsilyl (Si(CH3)2C(CH3)3, TBDMS), dimethylsilyl (SiH(CH3)2, DMS), and tert-butyldiphenylsilyl (Si(C6H5)2C(CH3)3, TBDPS). Previously developed (Si,C,Si)gHMQC methods and narrow 29Si lines allowed determination of coupling constants over up to five bonds. The measurable couplings depend on the nature of the substituents on the silicon. The two- and three-bond couplings are not affected by ring substitution in the para position. These properties render the 29Si-13C couplings suitable for line assignment in the spectra of silylated polyphenols. The calculations show that the 2-bond and 3-bond couplings, which are of a similar magnitude, are of opposite sign. The four- and five-bond couplings are affected by the substituent X in a not trivial manner.
- 29Si-13C couplings were measured in para substituted silylated phenols, X-C6H4-O-SiR1R2R3 (X = NO2, CF3, Cl, F, H, CH3, CH3O). The SiR1R2R3 silyl groups included trimethylsilyl (Si(CH3)3, TMS), tert-butyldimethylsilyl (Si(CH3)2C(CH3)3, TBDMS), dimethylsilyl (SiH(CH3)2, DMS), and tert-butyldiphenylsilyl (Si(C6H5)2C(CH3)3, TBDPS). Previously developed (Si,C,Si)gHMQC methods and narrow 29Si lines allowed determination of coupling constants over up to five bonds. The measurable couplings depend on the nature of the substituents on the silicon. The two- and three-bond couplings are not affected by ring substitution in the para position. These properties render the 29Si-13C couplings suitable for line assignment in the spectra of silylated polyphenols. The calculations show that the 2-bond and 3-bond couplings, which are of a similar magnitude, are of opposite sign. The four- and five-bond couplings are affected by the substituent X in a not trivial manner. (en)
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Title
| - 29Si-13C Spin-Spin Couplings over Si-O-Carom Link
- 29Si-13C Spin-Spin Couplings over Si-O-Carom Link (en)
- 29Si-13C Spin-spinové interakce přes Si-O-carom spojení (cs)
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skos:prefLabel
| - 29Si-13C Spin-Spin Couplings over Si-O-Carom Link
- 29Si-13C Spin-Spin Couplings over Si-O-Carom Link (en)
- 29Si-13C Spin-spinové interakce přes Si-O-carom spojení (cs)
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skos:notation
| - RIV/67985858:_____/06:00054948!RIV07-AV0-67985858
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http://linked.open.../vavai/riv/strany
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http://linked.open...avai/riv/aktivita
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http://linked.open...avai/riv/aktivity
| - P(GA203/03/1566), P(GA203/05/0388), P(GP203/02/D176), Z(AV0Z40550506), Z(AV0Z40720504)
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http://linked.open...iv/cisloPeriodika
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http://linked.open...vai/riv/dodaniDat
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http://linked.open...aciTvurceVysledku
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http://linked.open.../riv/druhVysledku
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http://linked.open...iv/duvernostUdaju
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http://linked.open...titaPredkladatele
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http://linked.open...dnocenehoVysledku
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http://linked.open...ai/riv/idVysledku
| - RIV/67985858:_____/06:00054948
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http://linked.open...riv/jazykVysledku
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http://linked.open.../riv/klicovaSlova
| - spinspin coupling; coupling mechanism; sign of coupling constants (en)
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http://linked.open.../riv/klicoveSlovo
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http://linked.open...odStatuVydavatele
| - GB - Spojené království Velké Británie a Severního Irska
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http://linked.open...ontrolniKodProRIV
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http://linked.open...i/riv/nazevZdroje
| - Magnetic Resonance in Chemistry
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http://linked.open...in/vavai/riv/obor
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http://linked.open...ichTvurcuVysledku
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http://linked.open...cetTvurcuVysledku
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http://linked.open...vavai/riv/projekt
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http://linked.open...UplatneniVysledku
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http://linked.open...v/svazekPeriodika
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http://linked.open...iv/tvurceVysledku
| - Schraml, Jan
- Sychrovský, Vladimír
- Sýkora, Jan
- Blechta, Vratislav
- Hetflejš, Jiří
- Šabata, Stanislav
- Soukupová, Ludmila
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http://linked.open...n/vavai/riv/zamer
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issn
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number of pages
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