Zobrazeno 1 - 10
of 398
pro vyhledávání: '"J. Callot"'
Autor:
S. Brooke-Barnett, Lidia Lonergan, J. Callot, N. Cellini, A. Csicsek, R. Graham, J. Ringenbach
Publikováno v:
81st EAGE Conference and Exhibition 2019.
Summary Detailed work in the Provencal sub-Alpine chains shows that salt extrusion can be deduced from the presence of a number of overturned flaps (‘megaflaps’)which are not internally deformed but show reducedstratigraphic section and commonly
Publikováno v:
The Journal of Organic Chemistry. 71:3111-3120
Friedel-Crafts acylation of nickel meso-tetraarylporphyrins with aryl anhydrides, followed by air oxidation in the presence of pyridine, DMAP, and excess anhydride, produced corroles in 8-21% yields. Other products include a porphyrinic ketone, an ad
Publikováno v:
Journal of Porphyrins and Phthalocyanines. :111-119
Aryl groups bound to the meso positions of porphyrins often react with neighboring groups, in particular ß-acyl groups to give highly diversified monomeric and dimeric new functionalized porphyrins. The products, whose meso-aryl ring approaches copl
Publikováno v:
Inorganic Chemistry. 40:3149-3153
The photooxidation of a meso-gem-disubstituted phlorin gave two isomeric biladienones in an equilibrium involving a Z-E double bond photoisomerism. The structures of these bile pigments were elucidated using NMR techniques and show terminal benzoyl a
Publikováno v:
Tetrahedron Letters. 42:2103-2106
Oxonaphtoporphyrins show a 1,4 reactivity involving the conjugated pyrrole double bond, the addition being followed by oxidation or elimination leading to rearomatization. Addition of nitrogen or carbon nucleophiles gives amino and substituted aminop
Autor:
Henry J. Callot, Bénédicte Krattinger
Publikováno v:
European Journal of Organic Chemistry. 1999:1857-1867
On reaction with organolithium compounds, N-substituted metalloporphyrins gave mixtures of mono-β-alkylated chlorins and hydroxychlorins, whereas free-base porphyrins give meso- + β- mono- and dialkylated products. Reduction of N-substituted porphy
Autor:
Henry J. Callot, Bénédicte Krattinger
Publikováno v:
Tetrahedron Letters. 39:1165-1168
Reaction of t-butyllithium with meso-tetraphenylporphyrin gives two di-t-butyl-dihydroporphyrins, the addition occuring at positions 2,3 or 5,10. 5,10-di-t-butyl-5,10-dihydro-meso-tetraphenylporphyrin adopts a helicoidal structure as shown by its X-r
Autor:
James A. Ferguson, Henry J. Callot, John D. Laycock, Richard A. Yost, Annick Rohrer, Rubén Ocampo, J. Martin E. Quirke
Publikováno v:
Journal of Mass Spectrometry. 32:978-983
Analysis of the electron ionization mass spectrum (EIMS) of 5-nitro octaethylporphyrin reveals that the molecular ion m/z 579 undergoes novel fragmentations. The typical fragmentation pathway of β-cleavage of peripheral substituents is suppressed. F
Electroweak measurements performed with data taken at the electron-positron collider LEP at CERN from 1995 to 2000 are reported. The combined data set considered in this report corresponds to a total luminosity of about 3fb-1 collected by the four LE
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2127::12e6d1c134c7839f3b1dd222ca4f8abd
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3073169
https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3073169
Autor:
Henry J. Callot, Bénédicte Krattinger
Publikováno v:
Tetrahedron Letters. 37:7699-7702
Borohydride reduction of N-alkyl or N-arylporphyrins gave the corresponding 5-H-phlorins. 5-Butyl-meso-tetraphenylphlorin as well as 2-Butyl-meso-tetraphenylchlorin were obtained on addition of n-butyllithium to meso-tetraphenylporphyrin free base.