Phase-Transfer Catalysis of the Michael Addition to α,β-Unsaturated Aldehydes

The liquid‐crystalline derivatives of 3,6‐disubstituted cyclohex‐2‐enones

“…It is known [34][35][36][37][38] that such substituted cyclohex-2enones can be prepared by the condensation of aromatic aldehydes with acetoacetic ester or acetylacetone; or by the interaction of some derivatives of cinnamic aldehyde or benzylidene acetone with acetoacetic ester, malonic ester or with acetylacetone; or by the Michael's connection of vinylalkyl(aryl)-ketones with derivatives of benzylmethylketone, acetoacetyc ester, or acetylacetone and the following cyclization of prepared products in the presence of the base. The condensation of the derivatives of acetophenone and vinylalkylketones in the presence of the strong bases (Bu t OK), and Nef's reaction are also used for the preparation of different cyclohex-2-enones.…”

“…(c) The lateral alkyl substituted phenyl-cyclohexenes and biphenyls (33)(34)(35). 46 It has been found that these compounds can be successfully used for the preparation of high-multiplexing mixtures (SLN-24,SLN-25,SLN-37) (see Table 5) with low threshold and saturation voltages of the twist-effect, steep voltage-contract characteristics, and fast response times.…”

Anisotropic Substituted Cyclohex-2-Enones – Synthesis, Transformations and Prospects of Practical Application

“…Проведенный анализ синтетических методов получения карбоциклических соединений показал [6][7][8][9][10][11][12][13][14], что для указанной цели наиболее перспективным является присоединение по Михаэлю арилвинилкетонов к 2-замещенным ацетоуксусным эфирам, производным бензилметилкетона, ацетилацетона или аналогичным им дикарбонильным соединениям с последующей циклизацией без выделения в присутствии оснований промежуточных аддуктов присоединения [15][16][17][18][19][20][21].…”

K10 montmorillonite catalysis

“…1 However, the occurrence in many cases of undesired competitive processes (bis-addition, intramolecular cyclization, rearrangement, etc.) has encouraged the use of alternative routes characterized by neutral conditions based, for example, on the employment of phase-transfer catalysts, 2 transition metal complexes, 3 lanthanides, 4,5 lithium iodide, 6 caesium fluoride, 7 dry alumina, 8 etc. Very interestingly, some years ago, Laszlo et al reported an efficient route 9 implying dual catalysis with the Michael donor activated by nickel(ii) bromide supported on a clay (K10-montmorillonite) and the Michael acceptor activated by iron(iii) chloride.…”