ChemInform Abstract: SITE-SELECTIVE DIELS-ALDER REACTIONS OF 1,4,5,8-NAPHTHODIQUINONES WITH ANTHRACENES AND SUCCESSIVELY WITH CYCLOPENTADIENE: ELECTRONIC EFFECTS VS. STERIC EFFECTS

1985 ◽  
Vol 16 (47) ◽  
Author(s):  
K. HAYAKAWA ◽  
M. ASO ◽  
K. KANEMATSU
Keyword(s):  
Diels Alder ◽  
Steric Effects ◽  
Electronic Effects ◽  
Site Selective

Electronic Effects on the Stereochemistry of the Diels—Alder Reaction1

1963 ◽  
Vol 28 (6) ◽  
pp. 1593-1596 ◽  
Author(s):  
Fred Kaplan ◽  
Harold Conroy
Keyword(s):  
Diels Alder ◽  
Electronic Effects

Intramolecular Diels-Alder reactions of furan derivatives: Steric and electronic effects of trifluoromethyl groups

1992 ◽  
Vol 57 (1-3) ◽  
pp. 239-243 ◽  
Author(s):  
Makoto Suzuki ◽  
Tomoko Okada ◽  
Takeo Taguchi ◽  
Yuji Hanzawa ◽  
Yoichi Iitaka
Keyword(s):  
Diels Alder ◽  
Electronic Effects ◽  
Furan Derivatives ◽  
Trifluoromethyl Groups

Electrophilic additions to allenes. VI. The role of steric versus electronic effects in the reactions of arenesulphenyl halides with allenes

1980 ◽  
Vol 58 (24) ◽  
pp. 2737-2744 ◽  
Author(s):  
Dennis G. Garrattz ◽  
Pierre L. Beaulieu
Keyword(s):  
Positive Charge ◽  
Steric Effects ◽  
Rate Data ◽  
Electronic Effects ◽  
Rate Determining Step ◽  
Minimal Importance ◽  
Electrophilic Additions

The role of steric and electronic effects during the rate and product determining steps for the addition of arenesulphenyl chlorides to 1,3-disubstituted allenes has been briefly examined. Both effects appear to be generally of minimal importance during the rate determining step. The available rate data indicate the presence of little, if any, build up of positive charge on sulphur. These results are interpreted in terms of an SN2 attack on bivalent sulphur leading to an alkylidenethiiranium ion intermediate. Steric effects are of greater importance in the product determining step, particularly when the sulphenyl chlorides possess two bulky ortho substituents, as in the case of 2,4,6-triisopropylbenzenesulphenyl chloride.

Site-Selective Halogenation of Polyoxovanadate Clusters: Atomically Precise Models for Electronic Effects of Anion Doping in VO2

2019 ◽  
Vol 142 (2) ◽  
pp. 1049-1056 ◽  
Author(s):  
Brittney E. Petel ◽  
Rachel L. Meyer ◽  
Michela L. Maiola ◽  
William W. Brennessel ◽  
Astrid M. Müller ◽  
...  
Keyword(s):  
Electronic Effects ◽  
Anion Doping ◽  
Site Selective ◽  
Polyoxovanadate Clusters

Ring-opening copolymerization of epoxide and dianhydride in the presence of manganese(III) asymmetrical bis-Schiff base catalysts

2014 ◽  
Vol 92 (11) ◽  
pp. 1098-1105 ◽  
Author(s):  
Deng-Feng Liu ◽  
Lu-Qun Zhu ◽  
Jing Wu ◽  
Li-Ying Wu ◽  
Xing-Qiang Lü
Keyword(s):  
Schiff Base ◽  
Ring Opening ◽  
Monomer Conversion ◽  
Structure Design ◽  
Steric Effects ◽  
Chain Growth ◽  
Electronic Effects ◽  
Reaction Conditions ◽  
Base Catalysts ◽  
Electronic And Steric Effects

Based on a series of asymmetrical bis-Schiff base H2Ln (n = 1–4) ligands with different electronic and steric effects, a series of [Mn(Ln)Cl] complexes 1–4 are obtained and shown to be effective catalysts in ring-opening copolymerization of epoxides and dianhydrides. Through the structure design, the input of electron-withdrawing bromine substituent para to the phenoxide group of the complexes is considerately beneficial to the improved activities. Moreover, steric and electronic effects of the suitable MeO substituent at the ortho orientation on the phenoxide group may both play a role in the formation of alternating ring-opening copolymers under the identical reaction conditions. In three cocatalysts tested, n-Bu4NBr is positive to monomer conversion and chain growth of polymer.

scholarly journals Combination of inverse electron-demand Diels–Alder reaction with highly efficient oxime ligation expands the toolbox of site-selective peptide conjugations

2015 ◽  
Vol 51 (55) ◽  
pp. 11130-11133 ◽  
Author(s):  
S. Hörner ◽  
C. Uth ◽  
O. Avrutina ◽  
H. Frauendorf ◽  
M. Wiessler ◽  
...  
Keyword(s):  
Alder Reaction ◽  
Diels Alder ◽  
Inverse Electron Demand ◽  
Highly Efficient ◽  
Diels Alder Reaction ◽  
Site Selective ◽  
Electron Demand

A modular bioconjugation strategy based on stepwise oxime ligation and inverse electron-demand Diels–Alder reaction.

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