Novel neo-confused octaphyrin(1.1.1.1.1.1.1.0) (1) was synthesized by oxidative ring closure of an octapyrrane bearing two terminal "confused" pyrroles. Crystal structures of its Zn(II) and Cu(II) complexes (2 and 3) show a figure-of-eight conformation with unique mononuclear coordination structures. Photophysical data and theoretical calculations suggest that the neo-confused octaphyrin 1 is a 34 pi electron conjugated species showing nonaromaticity. Coordination of pocopper and zinc ions results in the further narrowing of the HOMO-LUMO gaps.
Control of Oligomerization and Oxidation Steps in the Synthesis of Tris(pentafluorophenyl)corrole
作者:Carl Blumenfeld、Katherine J. Fisher、Lawrence M. Henling、Robert H. Grubbs、Harry B. Gray、Scott C. Virgil
DOI:10.1002/ejoc.201500276
日期:2015.5
The mechanistic features of oligomerization and oxidative cyclization steps in the synthesis of tris(pentafluorophenyl)corrole (1) have been thoroughly studied. Separation of the intermediates by preparative HPLC and analysis by NMR spectroscopy and high resolution mass spectrometry allowed for the identification of product-forming intermediates and monitoring of undesired byproducts. Conditions for
synthesized in one step. Oxidative cyclization of 1 with DDQ afforded a phlorin–dipyrrin conjugate (2), and subsequent FeCl3-assisted oxidative cleavage of 2 afforded a terminally di-α-methoxy substituted hexapyrrin (3). On the other hand, oxidation of 1 with FeCl3 afforded 3, a hexapyrrinone Fe3+ complex (4), and a hexaphyrin (1,1,1,1,1,0) (5). These results indicate that the oxidation of hexapyrranes may
一步合成AC 6 F 5取代的六吡咯烷(1)。用DDQ对1进行氧化环化得到了phlorin-dipyrrin共轭物(2),随后在FeCl 3辅助下进行了2的氧化裂解,得到了末端被二α-甲氧基取代的pyyryrrin(3)。另一方面,用FeCl 3氧化1得到3,六吡咯烷酮Fe 3+络合物(4)和六卟啉(1,1,1,1,1,0)(5)。这些结果表明六吡喃的氧化可被开发为合成新型线性和大环六吡咯的有效方法。