Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Rachel Ta-Shma"'
Autor:
Eli Breuer, Morris Srebnik, Mordechai Chevion, Avital Torres, Rachel Ta-Shma, Claes D. Enk, Abed Al Aziz Quntar
Publikováno v:
Tetrahedron. 62:5469-5473
Three pyrimidine derivatives (8a–c), differing from isouramil and divicine at C2, have been synthesized and their autoxidation rates measured spectrophotometrically. The autoxidation rates of all five pyrimidines (8a–c, isouramil and divicine) we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::adc95fa60a7add621bd442c9f8c8f8a0
https://doi.org/10.1016/j.tet.2006.03.049
https://doi.org/10.1016/j.tet.2006.03.049
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 2. :1961-1968
The thermodynamics, pH dependency and solvent effects of the fragmentation reaction of a series of α-oxyiminobenzylphosphonate monomethyl esters [(E)-1a–f] were examined in water and other hydroxylic solvents by UV and by 31P NMR spectroscopy at p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::96b788b3f5e413cefe706dfa85681856
https://doi.org/10.1039/b002267p
https://doi.org/10.1039/b002267p
Autor:
Rachel Ta-Shma, Zvi Rappoport
Publikováno v:
ChemInform. 24
Publisher Summary This chapter deals with the selectivity of an electrophilic carbon centre carrying a nucleofuge (RX) or of a solvolytically generated carbocation species (R + ) toward the two nucleophilic solvent components. The chapter explains th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a15a9a8e71198899fbaa1de243d7d066
https://doi.org/10.1002/chin.199308322
https://doi.org/10.1002/chin.199308322
Formation of diethyl 2-amino-1-cyclopentenylphosphonates: a simple synthesis with a unique mechanism
Autor:
Rachel Ta-Shma, Avital Shurki, Morris Srebnik, Artem Melman, Hemant Kumar Srivastava, Abed Al Aziz Quntar
Publikováno v:
The Journal of organic chemistry. 72(13)
Reaction of diethyl 5-chloro-1-pentynylphosphonate with primary and secondary amines produces novel 2-amino-1-cyclopentenylphosphonates, 1, in excellent isolated yields (79−88%). Calculations supported by experimental facts point to a two-step mech
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7c66ba0a2d5f5dcd3e6c2281e7c3bb8
https://pubmed.ncbi.nlm.nih.gov/17523670
https://pubmed.ncbi.nlm.nih.gov/17523670
Publikováno v:
ChemInform. 31
The thermodynamics, pH dependency and solvent effects of the fragmentation reaction of a series of α-oxyiminobenzylphosphonate monomethyl esters [(E)-1a–f] were examined in water and other hydroxylic solvents by UV and by 31P NMR spectroscopy at p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c55a598c323dc3d4dc6830f5277713e
https://doi.org/10.1002/chin.200049161
https://doi.org/10.1002/chin.200049161
Autor:
Rachel Ta-Shma, Zvi Rappoport
Publisher Summary This chapter deals with the selectivity of an electrophilic carbon centre carrying a nucleofuge (RX) or of a solvolytically generated carbocation species (R + ) toward the two nucleophilic solvent components. The chapter explains th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6eae321506ba7dbcbdc772d6a9493c5
https://doi.org/10.1016/s0065-3160(08)60066-0
https://doi.org/10.1016/s0065-3160(08)60066-0
Autor:
William P. Jencks, Rachel Ta-Shma
Publikováno v:
Journal of the American Chemical Society. 108:8040-8050
Structure-reactivity correlations are reported for general base catalysis of the addition of alcohols to 1-(4-(dimethylamino)phenyl)ethyl and 1-(4-methoxyphenyl)ethyl carbocations in 50:40:10 H/sub 2/O: CF/sub 3/CH/sub 2/OH:ROH. The addition of trifl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::11e79740a60d19de4ca2fecc32a5c5d0
https://doi.org/10.1021/ja00285a027
https://doi.org/10.1021/ja00285a027
Autor:
Rachel Ta-Shma, Zvi Rappoport
Publikováno v:
Journal of the American Chemical Society. 105:6082-6095
La linearite suggeree entre les logarithmes de la constante de vitesse de solvolyse de RX et la selectivite dans la capture du cation intermediaire R + par l'eau et l'azote dans l'acetone 80% sont reetudiees en utilisant des donnees de la litterature
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::de246c48cfa4474c2effc5645501329d
https://doi.org/10.1021/ja00357a020
https://doi.org/10.1021/ja00357a020
Autor:
Zvi Rappoport, Rachel Ta-Shma
Publikováno v:
Tetrahedron Letters. 23:781-784
In contrast to previous reports, the selectivities of four carbenium ions R + towards N 3 − and H 2 O (log(K N 3 − /K H 2 O )) change more than the solvolytic reactivities (log K solv ) of their rather reactive precursors RCl.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1409c3307a5ff190d4a2f23d7df5d0a1
https://doi.org/10.1016/s0040-4039(00)86948-8
https://doi.org/10.1016/s0040-4039(00)86948-8
Autor:
Rachel Ta-Shma, Zvi Rappoport
Publikováno v:
Journal of the American Chemical Society. 98:8460-8467
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74cfb0b1d1733d7991219d52ab8ecec3
https://doi.org/10.1021/ja00442a024
https://doi.org/10.1021/ja00442a024