15542-35-5Relevant academic research and scientific papers
Unsaturated carbonyl compounds and their preparation method and application
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Paragraph 0239-0246, (2019/07/04)
The invention discloses a unsaturated carbonyl compounds and their preparation method and application. The unsaturated carbonyl compounds of the general formula as the molecular structure of the following formula (I) as shown: The unsaturated carbonyl com
Iridium-Catalyzed Aerobic α,β-Dehydrogenation of γ,δ-Unsaturated Amides and Acids: Activation of Both α- And β-C-H bonds through an Allyl-Iridium Intermediate
Wang, Zhen,He, Zhiqi,Zhang, Linrui,Huang, Yong
, p. 735 - 740 (2018/01/26)
Direct aerobic α,β-dehydrogenation of γ, δ-unsaturated amides and acids using a simple iridium/copper relay catalysis system is described. We developed a new strategy that overcomes the challenging issue associated with the low α-acidity of amides and acids. Instead of α-C-H metalation, this reaction proceeds by β-C-H activation, which results in enhanced α-acidity. Conjugated dienamides and dienoic acids were synthesized in excellent yield with this reaction, which uses a simple reaction protocol. Mechanistic experiments suggest a catalyst resting state mechanism in which both α-C-H and β-C-H cleavage is accelerated.
Synthetic and spectroscopic studies of structural analogs of piper amides - The 5-aryl-2E,4E-pentadienamides
Banerji, Avijit,Banerjee, Tapasri,Sengupta, Ratna,Sengupta, Piyali,Das, Chittaranjan,Sahu, Anita
, p. 876 - 883 (2007/10/03)
The methyl esters and piperidides of fourteen 5-aryl-2E,4E-pentadienoic acids have been synthesized starting from the corresponding aryl aldehydes.
Substituent Effects on Carbon-13 NMR Chemical Shifts of Side-chain Carbons in 5-Aryl-2E,4E-pentadienoic Acid Derivatives
Banerji, Avijit,Ghosal, Tapasree,Acharyya, Aditi K.
, p. 546 - 549 (2007/10/02)
The 13C NMR spectra of two series of 5-aryl-2E,4E-pentadienoic acid derivatives, viz. the methyl esters and piperidides have been determined.The chemical shifts of C-2 and C-4 show very good correlations with the Hammett ?+-constants for all the substituents investigated, except for the para-nitro group which is capable of excerting a strong -R effect.A possible explanation for this has been advanced.Hammett correlations between substituents and the chemical shifts of both C-3 and C-5 carbons using ?0 parameters are less satisfactory.A reverse chemical shift effect has been observed for these two centres.
