Nickel-assisted complete cleavage of CO by a silylene/siliconoid hybrid under formation of an SiC enol ether bridge

2020 ◽  
Vol 56 (74) ◽  
pp. 10898-10901
Author(s):  
Nadine E. Poitiers ◽  
Volker Huch ◽  
Michael Zimmer ◽  
David Scheschkewitz
Keyword(s):  
Enol Ether ◽  
Ether Bridge

A silylene-siliconoid hybrid incorporates CO to form a SiC enol ether bridge in the presence of Ni(cod)2 ( = silicon).

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.

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

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
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