NHC Hg(<scp>ii</scp>) and Pd(<scp>ii</scp>) complexes based on 1,8-dihydroxy-9,10-anthraquinone: synthesis, structure and catalysis
作者:Zhi-Xiang Zhao、Ze-Liang Hu、Shao-Cong Yu、Qing-Xiang Liu
DOI:10.1039/c8nj02029a
日期:——
macrometallocycle for 3) was formed by one biscarbene ligand (L1′ for 1, L2 for 2, and L3 for 3) and one Hg(II) ion. Interestingly, the carbonyl group on the 9-position in complex 1 reacted with two acetonitrile molecules in the presence of the strong base KOtBu through losing one molecule of H2O to form L1′. As a result, two –CH2CN units were introduced to anthraquinone, in which the two –CH2CN units
三种双偶氮盐,1,8-双[3'-(N -R-偶氮酰基)丙氧基] -9,10-蒽醌六氟磷酸盐L 1 H 2(PF 6)2 – L 2 H 2(PF 6)2(R =乙基或甲基吡啶基,偶氮基=咪唑基或苯并咪唑基)和1,3-双[8'-(3'-((N-乙基-咪唑基)丙氧基)蒽醌-1-基氧基]丙烷六氟磷酸酯(L 3 H 2(PF 6)2)以及它们的三种大金属环N-杂环卡宾汞(II)配合物[L 1'制备了[ HgBr 2 ](1),[L 2 Hg](PF 6)2(3)和[L 3 Hg](PF 6)2(3),并通过1 H NMR和13 C NMR光谱和X-进行了表征射线晶体学。在配合物1-3中,每个macrometallocycle(18元macrometallocycle 1,一个18元和两个6元macrometallocycles为2,和28元为macrometallocycle 3)通过一个双卡宾配体(形成大号1'为1,L
Acid-catalyzed rearrangement of cyclobutanols. Syntheses of chrysenes, cyclopentenophenanthrenes, and diarylmethanes
作者:Edward Lee-Ruff、Alan C. Hopkinson、Hira Kazarians-Moghaddam、Brij Gupta、Morris Katz
DOI:10.1139/v82-026
日期:1982.1.15
Acid-catalyzed reactions of 8-aryl or 8,8-diarylbicyclo[4.2.0]oct-2-en-7-ols lead to tetrahydrophenanthrene derivatives. For example 8-(1-naphthyl)-bicyclo[4.2.0]oct-2-en-7-ols give substituted chrysenes in methanesulphonic acid. In the case of the homologous 7-aryl or 7,7-diarylbicyclo[3.2.0]hept-2-en-6-ols a novel transformation to diarlymethanes is observed. A mechanism is proposed which accounts
o-Quinonoid compounds. Part II. 1,4-Diphenyl-2-benzopyran-3-one and its iron carbonyl complexes
作者:J. M. Holland、D. W. Jones
DOI:10.1039/j39700000530
日期:——
1,4-Diphenyl-2-benzopyran-3-one is prepared by dehydration–rearrangement of 1,3-dihydroxy-1,3-diphenyl-indian-2-one and by dehydration of o-benzoylphenyl(phenyl)acetic acid. The reactions of the pyrone and its conversion into related o-quinonoidcompounds are described. The interconvertible ironcarbonylcomplexes of the pyrone are prepared by reaction with dodecacarbonyltri-iron. The role of metal–ligand
A new synthetic route to substituted tetracenes and pentacenes via stereoselective [4+2] cycloadditions of 1,4-dihydro-1,4-epoxynaphthalene and isobenzofuran
Stereoselective [4+2] cycloadditions of 1,4-dihydro-1,4-epoxynaphthalene and isobenzofuran were described. Among several possibilities, syn-exo and/or anti-endo isomers were selectively produced depending on the substitution pattern of the reactants. Importantly, the syn-exo isomer underwent acid promoted aromatization, affording the corresponding tetracene. These findings enabled us to prepare a substituted