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Statements

Subject Item
n2:RIV%2F67985858%3A_____%2F06%3A00054948%21RIV07-AV0-67985858
rdf:type
skos:Concept n18:Vysledek
dcterms:description
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 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. 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.
dcterms:title
29Si-13C Spin-spinové interakce přes Si-O-carom spojení 29Si-13C Spin-Spin Couplings over Si-O-Carom Link 29Si-13C Spin-Spin Couplings over Si-O-Carom Link
skos:prefLabel
29Si-13C Spin-spinové interakce přes Si-O-carom spojení 29Si-13C Spin-Spin Couplings over Si-O-Carom Link 29Si-13C Spin-Spin Couplings over Si-O-Carom Link
skos:notation
RIV/67985858:_____/06:00054948!RIV07-AV0-67985858
n3:strany
669;674
n3:aktivita
n8:P n8:Z
n3:aktivity
P(GA203/03/1566), P(GA203/05/0388), P(GP203/02/D176), Z(AV0Z40550506), Z(AV0Z40720504)
n3:cisloPeriodika
7
n3:dodaniDat
n16:2007
n3:domaciTvurceVysledku
n7:6618669 n7:4244494 n7:5056063 n7:1678671 n7:9958991 n7:2658879
n3:druhVysledku
n6:J
n3:duvernostUdaju
n12:S
n3:entitaPredkladatele
n14:predkladatel
n3:idSjednocenehoVysledku
510623
n3:idVysledku
RIV/67985858:_____/06:00054948
n3:jazykVysledku
n17:eng
n3:klicovaSlova
spinspin coupling; coupling mechanism; sign of coupling constants
n3:klicoveSlovo
n4:spinspin%20coupling n4:sign%20of%20coupling%20constants n4:coupling%20mechanism
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[2C40BB43A46A]
n3:nazevZdroje
Magnetic Resonance in Chemistry
n3:obor
n13:CF
n3:pocetDomacichTvurcuVysledku
6
n3:pocetTvurcuVysledku
7
n3:projekt
n10:GA203%2F03%2F1566 n10:GP203%2F02%2FD176 n10:GA203%2F05%2F0388
n3:rokUplatneniVysledku
n16:2006
n3:svazekPeriodika
44
n3:tvurceVysledku
Blechta, Vratislav Soukupová, Ludmila Šabata, Stanislav Schraml, Jan Sychrovský, Vladimír Hetflejš, Jiří Sýkora, Jan
n3:zamer
n15:AV0Z40720504 n15:AV0Z40550506
s:issn
0749-1581
s:numberOfPages
6