. "29Si-13C Spin-spinov\u00E9 interakce p\u0159es Si-O-carom spojen\u00ED"@cs . . . . "RIV/67985858:_____/06:00054948" . "510623" . "44" . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . "Blechta, Vratislav" . "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 . . . "29Si-13C interakce byly zm\u011B\u0159eny v para substituovan\u00FDch silylovan\u00FDch fenolech, X-C6H4-O-SiR1R2R3 (X = NO2, CF3, Cl, F, H, CH3, CH3O). Jako SiR1R2R3 silyl byly pou\u017Eity 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 interakc\u00ED z\u00E1vis\u00ED na substituentech na k\u0159em\u00EDku. Interakce p\u0159es dv\u011B a t\u0159i vazby naz\u00E1vis\u00ED na substituentech benzenov\u00E9ho j\u00E1dra. Interakce p\u0159es 4 a v\u00EDce vazeb jsou ovlivn\u011Bny substituentem."@cs . "29Si-13C Spin-spinov\u00E9 interakce p\u0159es Si-O-carom spojen\u00ED"@cs . "6"^^ . "spinspin coupling; coupling mechanism; sign of coupling constants"@en . "Soukupov\u00E1, Ludmila" . . "0749-1581" . "29Si-13C Spin-Spin Couplings over Si-O-Carom Link" . "29Si-13C Spin-Spin Couplings over Si-O-Carom Link"@en . "\u0160abata, Stanislav" . "Schraml, Jan" . . . . "Sychrovsk\u00FD, Vladim\u00EDr" . "7"^^ . . . . "[2C40BB43A46A]" . . . "29Si-13C Spin-Spin Couplings over Si-O-Carom Link"@en . "Hetflej\u0161, Ji\u0159\u00ED" . "6"^^ . "RIV/67985858:_____/06:00054948!RIV07-AV0-67985858" . . . . . . "Magnetic Resonance in Chemistry" . . . . "P(GA203/03/1566), P(GA203/05/0388), P(GP203/02/D176), Z(AV0Z40550506), Z(AV0Z40720504)" . "669;674" . "7" . "S\u00FDkora, Jan" . . "29Si-13C Spin-Spin Couplings over Si-O-Carom Link" . "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." . .