scholarly journals An Efficient Thermal Elimination Pathway toward Phosphodiester Hydrogels via a Precursor Approach

2020 ◽  
Vol 221 (5) ◽  
pp. 1900466 ◽  
Author(s):  
Rafael Dera ◽  
Hanne Diliën ◽  
Peter Adriaensens ◽  
Wanda Guedens ◽  
Thomas J. Cleij
Keyword(s):  
Thermal Elimination ◽  
Elimination Pathway

Synthesis oftrans-3,4-Dimethyl-4-(3-hydroxyphenyl)piperidine Opioid Antagonists:  Application of theCis-Thermal Elimination of Carbonates to Alkaloid Synthesis

1996 ◽  
Vol 61 (2) ◽  
pp. 587-597 ◽  
Author(s):  
John A. Werner ◽  
Louis R. Cerbone ◽  
Scott A. Frank ◽  
Jeffrey A. Ward ◽  
Parviz Labib ◽  
...  
Keyword(s):  
Opioid Antagonists ◽  
Alkaloid Synthesis ◽  
Thermal Elimination

Article

1999 ◽  
Vol 77 (5-6) ◽  
pp. 1118-1122
Author(s):  
Dennis N Kevill ◽  
Malcolm J D’Souza
Keyword(s):  
Full Range ◽  
Elimination Pathway ◽  
Ionization Channel

The specific rates of solvolysis of phenyl chlorothionoformate (PhOCSCl) are remarkably similar to those previously reported for phenyl chlorothioformate (PhSCOCl). When analyzed using the extended Grunwald-Winstein equation over the usual range of solvent types, these solvolyses show essentially identical divisions into the solvents favoring the addition-elimination channel and those favoring the ionization channel. The introduction of one sulfur caused a partial shift away from the addition-elimination pathway, which was dominant over the full range of solvents for phenyl chloroformate (PhOCOCl). Consistent with these results, introduction of the second sulfur within phenyl chlorodithioformate (PhSCSCl) leads to a completion of this shift, such that an extended Grunwald-Winstein treatment of the specific rates of solvolysis now shows the ionization pathway to be dominant over the full range of solvents.Key words: Grunwald-Winstein equation, solvent nucleophilicity, solvolysis, phenyl chlorothionoformate, phenyl chlorodithioformate.

A Density Functional Theory Study on the Ring-Opening Polymerization of D-Lactide Catalyzed by a Bifunctional-Thiourea Catalyst

2009 ◽  
Vol 62 (2) ◽  
pp. 157 ◽  
Author(s):  
Rong-Xiu Zhu ◽  
Ruo-Xi Wang ◽  
Dong-Ju Zhang ◽  
Cheng-Bu Liu
Keyword(s):  
Density Functional Theory ◽  
Ring Opening ◽  
Density Functional ◽  
Population Analysis ◽  
Density Functional Theory Calculations ◽  
Ring Opening Polymerization ◽  
Acyl Transfer ◽  
Frontier Molecular Orbital ◽  
Functional Theory ◽  
Elimination Pathway

The thiourea-catalyzed methanolysis of d-lactide, a model system for the initiation and propagation of the organocatalyzed ring-opening polymerization (ROP) of lactide, has been studied by performing density functional theory calculations. Both the catalyzed and uncatalyzed reactions are explored along two possible pathways: one involves the stepwise addition–elimination pathway and the other is related to the concerted pathway. It is found that the reaction without the presence of the catalyst is difficult because the barrier involved is as high as 176 kJ mol–1. With the aid of a thiourea catalyst, the barrier is reduced to 88 kJ mol–1 with a preference for the stepwise addition–elimination mechanism over the concerted one. The role of the catalyst has been rationalized by analyzing the frontier molecular orbital interactions between the catalyst and substrates and by performing natural population analysis. Finally, another mechanism involving acyl transfer is discussed for the thiourea-catalyzed ROP.

Mechanism of thermal elimination of ethane from iodotrimethylbis(dimethylphenylphosphine)platinum(IV)

1973 ◽  
Vol 49 (1) ◽  
pp. C61-C63 ◽  
Author(s):  
M.P. Brown ◽  
R.J. Puddephatt ◽  
C.E.E. Upton
Keyword(s):  
Thermal Elimination

In Situ Analysis of the Thermal Elimination Reaction in the Synthesis of Poly(p-phenylene vinylene)(PPV) and PPV Derivatives

2003 ◽  
pp. 173-185
Author(s):  
Georgia A. Arbuckle-Keil ◽  
Yolanda Liszewski ◽  
James Wilking ◽  
Bing Hsieh
Keyword(s):  
In Situ Analysis ◽  
Phenylene Vinylene ◽  
Elimination Reaction ◽  
Thermal Elimination

The Heck olefination reaction; A DFT study of the elimination pathway

1998 ◽  
Vol 39 (20) ◽  
pp. 3229-3232 ◽  
Author(s):  
Robert J. Deeth ◽  
Andrew Smith ◽  
King Kuok (Mimi) Hii ◽  
John M. Brown
Keyword(s):  
Dft Study ◽  
Elimination Pathway

From -Diols via Thermal Elimination

2007 ◽  
pp. 1
Author(s):  
C. E. Masse
Keyword(s):  
Thermal Elimination

Synthesis of β-sulfinyl cyclobutane carboxylic amides via a formal α to β sulphoxide migration process

2019 ◽  
Vol 17 (25) ◽  
pp. 6143-6147
Author(s):  
Lorenza Ghisu ◽  
Nicola Melis ◽  
Lorenzo Serusi ◽  
Alberto Luridiana ◽  
Francesco Soddu ◽  
...  
Keyword(s):  
Tandem Reaction ◽  
Migration Process ◽  
Thermal Elimination

An original tandem reaction consisting of a thermal elimination–addition process was developed.

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