Visible Light-Mediated [2 + 2] Cycloaddition Reactions of 1,4-Quinones and Terminal Alkynes
A single-step synthesis of 4-hydroxy-functionalized bi-aryl and aryl/alkyl ketones via oxidative coupling of terminal alkynes with benzoquinones is reported. Furthermore, with naphthoquinones, owing to the cross-resonance of carbonyl with the aromatic ring, alkene-alkyne cycloaddition is more favored to give four-membered carbocyclic adducts, thereby precluding the requirement of preactivated alkynes.
Sultan, Shaista,Bhat, Muneer-Ul-Shafi,Rizvi, Masood Ahmad,Shah, Bhahwal Ali
p. 8948 - 8958
(2019/08/12)
MESOGENIC AND NON MESOGENIC CENTRAL RIGID CORES.
The mesogenic power of several central rigid cores is measured by means of depolarized Rayleigh scattering. It is shown that there is a close relation between the angular correlation parameter J and the mesogenic power that lead us to define mesogenic and
Destrade,Tinh,Gasparoux
p. 273 - 288
(2007/10/02)
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