15795-19-4Relevant articles and documents
Substituent Effects on 13C and 1H Chemical Shifts in 3-Benzylidene-2,4-pentanediones
Solcaniova, E.,Hrnciar, P.,Liptaj, T.
, p. 55 - 57 (1982)
Substituent effects on the 13C and 1H chemical shifts have been studied for derivatives of 3-benzylidene-2,4-pentanedione.A significant correlation has been found between chemical shifts of the Z carbonyl group and (C-2) and Hammett constants, while no correlation has been found for the E carbonyl group (C-4).Attempts have been made to determine the structural factors which influence these effects.The conformation of 3-benzylidene-2,4-pentanediones has been determined by 13C and 1H NMR spectroscopy.
An efficient iodine-catalysed Knoevenagel condensation reaction in the presence of acetic anhydride
Li, Zhong-Xian,Liu, Xiao-Pei,Qiu, Zhen,Xu, Dan,Yu, Xue-Jun
experimental part, p. 35 - 36 (2011/04/24)
A mild, simple and efficient iodine catalysed system has been developed for the Knoevenagel condensation of 1,3-dicarbonyl compounds with various aromatic aldehydes in the presence of acetic anhydride. The reaction gave good to excellent yields for a broad range of substrates.
Efficient organocatalyzed solvent-free selective synthesis of conjugated enones
Goswami, Papori,Das, Babulal
scheme or table, p. 897 - 900 (2009/05/27)
A series of conjugated dienones and enones were synthesized by a reaction of both conjugated and simple aldehydes, respectively, with 1,3-dicarbonyl compounds and aldehydes under solvent-free conditions at room temperature in the presence of 10 mol % of l-proline as catalyst. The selective formation of one isomer was observed exclusively with most of the 1,3-dicarbonyl compounds and aldehydes. The most commonly formed xanthene derivative from the cyclic diketones is inhibited with our protocol, with the exclusive formation of conjugated dienones only.
