Zobrazeno 1 - 10
of 267
pro vyhledávání: '"Frederick G. Bordwell"'
Autor:
Helmut Schlemper, Heinz Wilhelm Rotter, M. Fletschinger, Christian Hasenfratz, Guo-Zen Ji, Hans Georg von Schnering, Leonhard Walz, Dietmar Putzas, Carol Ottaway, A. V. Satish, Thomas Breuer, Joachim Boele, Jürgen Willaredt, Karl Peters, Reinhard Schwesinger, Frederick G. Bordwell, Eva-Maria Peters, Tim Dambacher, Hans Fritz
Publikováno v:
Liebigs Annalen. 1996:1055-1081
The syntheses and properties of novel, extremely strong uncharged polyaminophosphazene bases up to a high level of steric hindrance are described. Most of the systems were readily prepared in up to molar quantities and conveniently recovered from the
Autor:
Weizhong Liu, Frederick G. Bordwell
Publikováno v:
Journal of Physical Organic Chemistry. 11:397-406
Acidities and bond dissociation energies (BDEs) of the N–H bond in two phenylsulfenylamides, PhSNHBz and PhSNH-t-Bu, and four phenylsulfenylanilides, 4-GC6H4NHSPh, where G = MeO, H, Br and CN, were measured in order to compare the effects of substi
Publikováno v:
Journal of Physical Organic Chemistry. 11:10-14
The equilibrium acidities in DMSO of nine p- and m-substituted benzaldoximes and eight p-substituted phenyl methyl ketoximes were measured. Estimates of the homolytic bond dissociation energies (BDEs) of the acidic O—H bonds in these compounds were
Publikováno v:
Journal of the American Chemical Society. 119:9125-9129
The equilibrium acidities in DMSO for phenylhydrazine, five of its p-substituted derivatives, 1,2-diphenylhydrazine, and 1,1,2-triphenylhydrazine were measured and the BDEs of their acidic N−H bonds were estimated by using the following equation: B
Autor:
Shizhong Zhang, John A. Soderquist, Anil M. Rane, Michael J. Diaz, Jaime Vaquer, Frederick G. Bordwell
Publikováno v:
Tetrahedron Letters. 37:2561-2564
A new solid-liquid phase transfer catalyst, trisopropylsilanol (TIPSOH), has been developed which, through the silanol/silanoate system, allows KOH to quantitatively convert even primary alkyl halides to alkenes avoiding both ether and alcohol by-pro
Autor:
Frederick G. Bordwell, Wei-Zhong Liu
Publikováno v:
Journal of the American Chemical Society. 118:10819-10823
The homolytic bond dissociation energies (BDEs) of the O−H bonds in DMSO solution for (a) phenol and a number of its derivatives, (b) three oximes, (c) three alcohols, (d) three hydroxylamines, and (e) two hydroxamic acids have been estimated by eq
Autor:
Shizhong Zhang, Frederick G. Bordwell
Publikováno v:
The Journal of Organic Chemistry. 61:51-54
The effects of an α-Me3SiCH2 group on the equilibrium acidities in DMSO of the acidic C−H bonds in esters, including ethyl thionacetate, diethyl malonate, and ethyl acetoacetate, were found to diff...
Autor:
Frederick G. Bordwell, Wei-Zhong Liu
Publikováno v:
Journal of the American Chemical Society. 118:8777-8781
The equilibrium acidities (pKHA values) in DMSO of the following hydroxylamines have been measured: (1) N-phenylhydroxylamine and its p-bromo and p-cyano derivatives, (2) N-benzyl-N-phenylhydroxylamine and its p-bromo and p-cyano derivatives, (3) O-b
Autor:
Yongyu Zhao, Frederick G. Bordwell
Publikováno v:
The Journal of Organic Chemistry. 61:6623-6626
Cleavage of radical anions, HA(*)(-), have been considered to give either H(*) + A(-) (path a) or H(-) + A(*) (path b), and factors determining the preferred mode of cleavage have been discussed. It is conceivable that cleavage to give a proton and a
Autor:
Frederick G. Bordwell, Weizhong Liu
Publikováno v:
The Journal of Organic Chemistry. 61:4778-4783
The oxidation potentials of 19 nitrogen bases (abbreviated as B: six primary amines, five secondary amines, two tertiary amines, three anilines, pyridine, quinuclidine, and 1,4-diazabicyclo[2,2,2]octane), i.e., E(ox)(B) values in dimethyl sulfoxide (