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Publikováno v:
Magnetic Resonance in Chemistry. 34:638-645
binuclear complex [ AI,(p-OH),(C,,H,0,),(Na)4(H~O)4] was obtained, which is stable as the tetrahydrate and is observed even in the gas phase by electrospray mass spectrometry. With potassium hydroxide the monohydrate form is obtained. These two produ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3fe0aa2036eddf7720c2cac11950ef46
https://doi.org/10.1002/(sici)1097-458x(199608)34:8<638::aid-omr926>3.0.co
https://doi.org/10.1002/(sici)1097-458x(199608)34:8<638::aid-omr926>3.0.co
Publikováno v:
ChemInform. 23
The lactones 2a and 2b are different only by the configurationof the carbon C5 of the side-chain, but present quite different features in the ring conformation. Inspection of the NMR spectra of 2b , compared to 2a , shows a evident flattening of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f1ac797c01f0c677092f8707bad47647
https://doi.org/10.1002/chin.199224150
https://doi.org/10.1002/chin.199224150
Publikováno v:
Tetrahedron. 48:1617-1626
The lactones 2a and 2b are different only by the configurationof the carbon C5 of the side-chain, but present quite different features in the ring conformation. Inspection of the NMR spectra of 2b , compared to 2a , shows a evident flattening of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1da5ea8f0f93e744bea67d6b629f35fb
https://doi.org/10.1016/s0040-4020(01)88720-2
https://doi.org/10.1016/s0040-4020(01)88720-2
Publikováno v:
Tetrahedron. 46:5621-5632
The NMR spectra of a series of hindered tetrahydrofuran compounds, disubstituted in C5 and with two polar groups in C2 (Br, Cl or OMe in the anomeric position) and C3 (Br or Cl) have been examined. When the two polar groups are cis, the anomeric grou
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b16cf435fa82385dbcfa3cd46c4708cd
https://doi.org/10.1016/s0040-4020(01)87762-0
https://doi.org/10.1016/s0040-4020(01)87762-0
Autor:
Gilbert Dana, Estera Touboul
Publikováno v:
Tetrahedron Letters. 31:3549-3552
The stretching frequencies of equatorial and axial fused tetrahydropen C 2 -D bonds appear around 2190 and 2100 cm −1 , with a wide multiplicity. These frequencies are lowered by 20 to 70 cm −1 when an OR group is added on C2. An sp 2 hybridizati
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https://explore.openaire.eu/search/publication?articleId=doi_________::7d51339e9e03f1b118144be9a7923bcc
https://doi.org/10.1016/s0040-4039(00)94439-3
https://doi.org/10.1016/s0040-4039(00)94439-3
Autor:
Gilbert Dana
Publikováno v:
Caractérisation et propriétés de la matière.
Les methodes spectroscopiques sont des procedes d’etude physique mettant en jeu des phenomenes d’echange d’energie entre la matiere et un rayonnement electromagnetique. Il peut s’agir d’ absorption ou d’ emission de lumiere, la « lumiere
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https://explore.openaire.eu/search/publication?articleId=doi_________::1fa5a79cc92c13cb007cb672ed3b5789
https://doi.org/10.51257/a-v1-k1015
https://doi.org/10.51257/a-v1-k1015
Autor:
Gilbert Dana
Publikováno v:
Caractérisation et propriétés de la matière.
Comme toute methode spectroscopique, la spectroscopie infrarouge met en jeu des echanges d’energie entre une molecule et un rayonnement electromagnetique. Dans l’infrarouge proche (12 500 a 4 000 cm −1 ) et moyen (4 000 a 650 cm −1 ), on obse
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3844b07dd02e15de3f776dc634f5f43b
https://doi.org/10.51257/a-v1-k1010
https://doi.org/10.51257/a-v1-k1010
Publikováno v:
Tetrahedron. 44:429-442
Resume Les aryl-2- tetrahydrofurannes de la figure 1 ont ete examines par RMN du proton. Les couplages vicinaux montrent clairement qu'a l'interieur mĕme de chacune des series a , b ou c , le tetrahydrofuranne peut subir une inversion conformationne
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fd255c29042270b56e8ae7f1f8be57d5
https://doi.org/10.1016/s0040-4020(01)85834-8
https://doi.org/10.1016/s0040-4020(01)85834-8
Publikováno v:
Canadian Journal of Chemistry. 54:1827-1836
The 13C nmr spectra of derivatives of phenylfuran and phenylpyrrole were studied. The α and β carbons of the heterocycle, conjugated to the substituent X in the para position of the benzene ring, show variations in chemical shifts which bear a simp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f19c42f18795c3db2be48824173055aa
https://doi.org/10.1139/v76-259
https://doi.org/10.1139/v76-259