scholarly journals Combined XPS and DFT investigation of the adsorption modes of methyl enol ether functionalized cyclooctyne on Si(001)

ChemPhysChem ◽  
2020 ◽  
Author(s):  
Timo Glaser ◽  
Jannick Meinecke ◽  
Christian Länger ◽  
Jan-Niclas Luy ◽  
Ralf Tonner ◽  
...  
Keyword(s):  
Enol Ether

scholarly journals Revisiting the mechanism of β-O-4 bond cleavage during acidolysis of lignin VII: acidolyses of non-phenolic C6-C2-type model compounds using HBr, HCl and H2SO4, and a proposal on the characteristic action of Br− and Cl−

2020 ◽  
Vol 66 (1) ◽  
Author(s):  
Qiaoqiao Ye ◽  
Tomoya Yokoyama
Keyword(s):  
Model Compound ◽  
Bond Cleavage ◽  
Type Model ◽  
Enol Ether ◽  
Lignin Model Compound ◽  
Benzyl Cation ◽  
Acid Type ◽  
Unstable Compound ◽  
Lignin Model ◽  
Acidolysis Reaction

AbstractA non-phenolic C6-C2-type lignin model compound with the β-O-4 bond, 2-(2-methoxyphenoxy)-1-(3,4-dimethoxyphenyl)ethanol (I), was acidolyzed in aqueous 82% 1,4-dioxane containing HBr, HCl, or H2SO4 with a concentration of 0.2 mol/L at 85 ℃ to examine the differences between these acidolyses. Compound I primarily converted to an enol ether compound, 1-(2-methoxyphenoxy)-2-(3,4-dimethoxyphenyl)ethene (II), via the benzyl cation followed by acidolytic β-O-4 bond cleavage regardless of the acid-type, although the disappearance rates of compound I were remarkably different (HBr > HCl >> H2SO4). Acidolyses of compound II using these acids under the same conditions showed a similar tendency, but the rate differences were much smaller than in the acidolyses of compound I. Acidolyses of the α-methyl-etherified derivative of compound I (I-α-OMe) using these acids under the same conditions suggested that the formation rates of the benzyl cation from compound I-α-OMe (also from compound I) are not largely different between the acidolyses using these acids, but those of compound II from the benzyl cation are remarkably different. Acidolysis of the α-bromo-substituting derivative of compound I (I-α-Br) using HBr under the same conditions showed a characteristic action of Br¯ in the acidolysis. Br¯ adds to the benzyl cation generated from compound I or I-α-OMe to afford unstable compound I-α-Br, resulting in acceleration of the formation of compound II and of the whole acidolysis reaction.

scholarly journals Copper(ii) complexes of N-propargyl cyclam ligands reveal a range of coordination modes and colours, and unexpected reactivity

2021 ◽  
Author(s):  
Andrew J. Counsell ◽  
Mingfeng Yu ◽  
Mengying Shi ◽  
Angus T. Jones ◽  
James M. Batten ◽  
...  
Keyword(s):  
Enol Ether ◽  
Coordination Modes

Copper(ii) complexes of cyclam ligands with 1, 2, 3 or 4 pendant alkynes have been prepared and characterised crystallographically and spectroscopically. An unexpected hydroalkoxylation reaction is observed, affording an enol ether from the alkyne.

Nitro enol ether 4-nitro-1-cyclohexyl-3-ethoxy-2-oxo-3-pyrroline. Synthesis and use as a reagent for amino group protection

1974 ◽  
Vol 39 (23) ◽  
pp. 3351-3354 ◽  
Author(s):  
Philip L. Southwick ◽  
Richard F. Dufresne ◽  
John J. Lindsey
Keyword(s):  
Amino Group ◽  
Enol Ether

Antibacterial and antioxidant activities of a novel enol ether nor-sesquiterpene isolated from Myrtus nivellei Batt. & Trab.

Fitoterapia ◽  
2021 ◽  
pp. 104987
Author(s):  
Rym Gouta Demmak ◽  
Mamdouh Abdel-Mogib ◽  
Simon Bordage ◽  
Jennifer Samaillie ◽  
Chawki Benssouici ◽  
...  
Keyword(s):  
Antioxidant Activities ◽  
Enol Ether

Synthesis and biological evaluation of strigol analogues modified in the enol ether part

1997 ◽  
pp. 767-774 ◽  
Author(s):  
Jan Willem ◽  
J. F. Thuring ◽  
Angelique A. M. A. van Gaal ◽  
Sander J. Hornes ◽  
Margreet M. de Kok ◽  
...  
Keyword(s):  
Biological Evaluation ◽  
Enol Ether ◽  
Synthesis And Biological Evaluation

Synthesis of α-Arylcarboxylic Acid Amides from Silyl Enol Ether via Migratory Amidation with 2-Azido-1,3-dimethylimidazolinium Hexafluorophosphate

2013 ◽  
Vol 42 (7) ◽  
pp. 691-693 ◽  
Author(s):  
Mitsuru Kitamura ◽  
Kento Murakami ◽  
Yuichiro Shiratake ◽  
Tatsuo Okauchi
Keyword(s):  
Enol Ether ◽  
Silyl Enol Ether

Construction of β-Trifluoromethyl Enol Ether via Base-Promoted C–O Coupling and Rearrangement of Hydrogen Atom

2017 ◽  
Vol 82 (9) ◽  
pp. 4721-4728 ◽  
Author(s):  
Kun Dai ◽  
Kuan Wang ◽  
Yang Li ◽  
Jian-Gang Chen ◽  
Zhong-Wen Liu ◽  
...  
Keyword(s):  
Hydrogen Atom ◽  
Enol Ether
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