Zobrazeno 1 - 10
of 168
pro vyhledávání: '"J. Levisalles"'
Autor:
Et J. Levisalles, L. Dehennin
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 85:333-345
The formation of heptafluorobutanoic esters of some steroidal alcohols, phenol and conjugated ketone was described. The kinetic study of these reactions in presence of acid showed a hyperbolic relationship between kexp and the acid concentration for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a7fdf452b0dfa418ebf83c581711dacb
https://doi.org/10.1002/bscb.19760850509
https://doi.org/10.1002/bscb.19760850509
Publikováno v:
Tetrahedron. 54:5287-5304
Synthesis of p -toluenesulfonates 8b and 9b and of labelled analogs is described and previous assignements of proton NMR signals for quaternary methyl groups are confirmed. Acetolysis of these p -toluenesulfonates in the presence of NaOAc gave both s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d1e8565983e18c2a85f0520e58dceef
https://doi.org/10.1016/s0040-4020(98)00196-3
https://doi.org/10.1016/s0040-4020(98)00196-3
Autor:
Martin Weissenberg, J. Levisalles
Publikováno v:
Tetrahedron. 51:5711-5742
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::08f862d5fbff2b5781414514d3531f50
https://doi.org/10.1016/0040-4020(94)00673-i
https://doi.org/10.1016/0040-4020(94)00673-i
Publikováno v:
Tetrahedron. 49:7679-7690
Resume Les etats de transition de differents processus thermiques (elimination, rearrangement sigmatropique) ont ete evalues par la methode AM1. Le processus de rearrangement sigmatropique est le plus favorise et l'etat de transition bateau est plus
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ccf01ad3905e2b7dfe101b5fc3dc11e9
https://doi.org/10.1016/s0040-4020(01)87243-4
https://doi.org/10.1016/s0040-4020(01)87243-4
Autor:
Martin Weissenberg, J. Levisalles
Publikováno v:
ChemInform. 26
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8ae012872fb7adb2ebf89825948992c1
https://doi.org/10.1002/chin.199537311
https://doi.org/10.1002/chin.199537311
Autor:
Didier Villemin, J. Levisalles
Publikováno v:
Tetrahedron. 36:3181-3185
Esters of alkenoic acids, including insect pheromones as examples, have been synthesized using alkene metathesis reactions.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::af0766e1180a56ddd6a2657bb459a195
https://doi.org/10.1016/0040-4020(80)80163-3
https://doi.org/10.1016/0040-4020(80)80163-3
Publikováno v:
Journal of Organometallic Chemistry. 177:239-244
Treating (CO)5WC(Ph)Ph with cyclic enol ethers in n-hexane, leads, in the case of the cyclopentanone derivative, to ring-opened product (CO)5WC(OEt)[(CH2)3CHC(Ph)Ph] which has been isolated and characterized. The ring size in the enol ether
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c9979880d8b174e30f7f92d6ea731ba
https://doi.org/10.1016/s0022-328x(00)92349-0
https://doi.org/10.1016/s0022-328x(00)92349-0
Publikováno v:
Tetrahedron. 39:103-115
Absolute rates of bromination were measured for two series of derivatives of steroidal ketones 3, enol acetates 1 and enol methyl ether 2. Axial substituents exhibited a large effect on rates, which increased by 15,000 fold on going from (X=CH3; Y=CN
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ce7c3b5b30fc321e7ceacce31f2d27ed
https://doi.org/10.1016/s0040-4020(01)97635-5
https://doi.org/10.1016/s0040-4020(01)97635-5
Publikováno v:
Journal of Organometallic Chemistry. 187:233-242
The reaction of MeLi with MeOC(Me)W(CO) 5 (I) gives an unexpected binuclear complex [(CO) 4 W] 2 HCCHC(Me) 2 (II), the X-ray structure which shows a very short HCCH bond. A mechanism for the formation of II is outlined.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9397c6913aaad78f42e7636a190a94c9
https://doi.org/10.1016/s0022-328x(00)81792-1
https://doi.org/10.1016/s0022-328x(00)81792-1
Publikováno v:
Organic Magnetic Resonance. 10:192-197
Isoles et identifies, vingt-cinq chlorures vinyliques ont ete caracterises par resonance magnetique du proton (RMN 1H), par chromatographie en phase vapeur (CPV) et, pour certains, par voie chimique. De nouveaux increments specifiques du groupe alkyl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8d12022e9bed2a45b545d033ab59880b
https://doi.org/10.1002/mrc.1270100143
https://doi.org/10.1002/mrc.1270100143