Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Dirk Tavernier"'
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 83:357-368
The 1H-NMR spectra were studied of a series of 2-Me-5-R-5-o1,3-dioxanes (5) (R = H, Me, Et, i.Pr; o of 2-Me-spiro(1,3-dioxane-5,9′-fluorene) (14), of 5-R-4,4-dio-1,3-dioxanes (14) (R = Me, Et, n.Pr, i.Pr and i.Bu) and of 5-R-spiro(1,3-dioxane-4,2
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c8a978399a28aaf0ac95098a4cf751e
https://doi.org/10.1002/bscb.19740830907
https://doi.org/10.1002/bscb.19740830907
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 84:333-336
The chair-chair equilibrium in cis-2-methoxy-cis-decalane has been studied by 1H-NMR spectroscopy; the conformer featuring the equatorial methoxyl is the more stable one; ΔG°198 = 1.2 ± 0.1 and ΔG°291 = 1.4 ± 0.2 kcal.mole−1.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b93905996afd38206910293aa47ea07
https://doi.org/10.1002/bscb.19750840407
https://doi.org/10.1002/bscb.19750840407
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 75:396-412
PMR coupling values and shifts of twenty three 1, 3-dioxanes with rigid structure have been determined. The coupling data are in accordance with a chair conformation which is less buckled than that of cyclohexane derivatives. It is necessary to take
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f5c7b378d8ecab64b4f758f1b6731440
https://doi.org/10.1002/bscb.19660750513
https://doi.org/10.1002/bscb.19660750513
Autor:
M. J. O. Anteunis, Dirk Tavernier
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 76:475-481
The chemical shift difference Δν of methoxyprotons of alkyl-gem-di-methoxycyclohexanes is dependent on temperature. This dependence cannot be solely explained in terms of a chair-chair equilibrium. Other effects must play a role. An earlier proposi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::262d9e3c5f0b40b3ce0cf897fbedfa92
https://doi.org/10.1002/bscb.19670760706
https://doi.org/10.1002/bscb.19670760706
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 98:294-297
The barrier (ΔG≠) to ring inversion in the title compound amounts to 56.7 kJ·mol−1 at 299 K. The inversion mechanism is discussed. The barrier was measured by dynamic 13C NMR spectroscopy. The 13C shifts of the title compound have been assigned
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b43e5b4dee21816ca7a17892d95ab10
https://doi.org/10.1002/recl.19790980509
https://doi.org/10.1002/recl.19790980509
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 84:67-75
We have ascertained the structure of the adducts of myrcene and the following carbenes: (i) dichlorocarbene (ii) carbethoxycarbene and (iii) methylene (Simmons-Smith procedure). With dichlorocarbene, the diadduct (2', 2'-dichloro-3 ', 3'-dimethyl)-(1
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d4d583a69a21db0ac3280efcf42f1988
https://doi.org/10.1002/bscb.19750840107
https://doi.org/10.1002/bscb.19750840107
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 79:441-450
The influences of β-substituents–either in equatorial or in axial positions–on the numerical value of 2J(H-2) (the geminal coupling J(OCH2O)) in 1,3-dioxanes, have been scrutinized. Influences on 2J(H-2) by the nature and electronegativity of th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c0aeb61722500d989a538067ca76f168
https://doi.org/10.1002/bscb.19700790706
https://doi.org/10.1002/bscb.19700790706
Autor:
M. J. O. Anteunis, Dirk Tavernier
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 82:405-411
The chair-chair equilibrium in trans-4, 5, 5-triMe-6-alkyl-1, 3-dioxanes (alkyl = Et, n.Pr, i.Bu, neoPe, i.Pr and O) has been studied by the slow exchange NMR shift method. The conformer with equatorial alkylgroup is the more stable one, free energy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd8e7076221e224ecf13f4d374934fbd
https://doi.org/10.1002/bscb.19730820508
https://doi.org/10.1002/bscb.19730820508
Autor:
Dirk Tavernier, M. J. O. Anteunis
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 76:157-167
PMR Spectroscopic evidence has been advanced (3) to prove that the fundamental conformation of 4-t. Bu-4-Me-1, 3-dioxane (Ia) is the stretched boat form (Ib). This paper discusses the PMR spectra of trans-4, 6-dialkyl-1, 3-dioxanes, including trans-4
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::183d8c2ccfba3a4712bd5bcfc98bb55b
https://doi.org/10.1002/bscb.19670760116
https://doi.org/10.1002/bscb.19670760116
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 83:497-506
The free energy barrier to ring reversal in 5,5-dii. Pr-, and 5,5-dic. Pe-1,3-dioxane is measured to be 7.3 (153 K) and 6.6 (137 K) kcal/mole, respectively. An explanation for this exceptionally low barrier is offered; it invokes the existence of rot
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::be7a879a7372546ec59dda0150bcb6a4
https://doi.org/10.1002/bscb.19740831112
https://doi.org/10.1002/bscb.19740831112