Rhodium and ruthenium porphyrins catalyze the one-pot formation of biaryl derivatives from arylethynes with high selectivity, giving interesting derivatives not easy to obtain using other different methods; the porphyrin catalysts can be recovered and reused after several experiments with no change of activity.
Fe‐Catalyzed Intramolecular Cross‐Dehydrogenative Arylation (CDA), Efficient Synthesis of 1‐Arylnaphthalenes and 4‐Arylcoumarins
作者:Haiyan Diao、Changcheng Wang、Zhen Zhang、Zhangjie Shi、Feng Liu
DOI:10.1002/hlca.202100056
日期:2021.7
Direct cross-dehydrogenative coupling of different inert C−H bonds is the most straightforward and environmentally benign method to construct C−C bonds. In this paper, we developed an iron-catalyzed intramolecular cross-dehydrogenative arylation (CDA) between benzylic C(sp3)H bond and aromaticC(sp2)H bond. From the readily available linear substrates, 1-arylnaphthalenes and 4-arylcoumarins can be
method of the sum of the free valence indices in the first excited state (ΣF*) of the terminal atoms concerned in the photocyclizations of 1,4-diaryl-1,3-butadienes give values which are accurate guides in predicting the photoproducts obtained in the photocyclization-oxidation reactions of 1,4-diaryl-1,3-butadienes. Irradiation of 1,4-di-α-naphthyl-1,3-butadiene gave 1-α-naphthylphenanthrene. The pho
Photocyclisations of 1,4-diarylbut-1-en-3-ynes. Part III. Scope and limitations of the reaction
作者:Alois H. A. Tinnemans、Wim H. Laarhoven
DOI:10.1039/p29760001115
日期:——
The photoreactivity of a large series of diarylbutenynes has been studied in order to establish the scope of this photocyclisationreaction. The conditions for an optimal yield of photocyclisation products are discussed. On addition of iodine to the butenyne solution, irradiation gives rise to iodo-derivatives of the normal cyclisation products, whereas in the presence of iodine and with benzene as