Tetraoxa[24]porphyrinogen(4.0.4.0)/Tetraoxa[22]porphyrin(4.0.4.0) dication A further Isomer of the Aromatic 22π-Tetraoxaporphyrins

详细信息    查看全文

• 作者：Mä ; rkl ; Gottfried ; Hafner ; Markus ; Kreitmeier ; Peter ; Burgemeister ; Thomas ; Kastner ; Fritz ; et. al.
• 刊名：Tetrahedron
• 出版年：1996
• 出版时间：February 5, 1996
• 年：1996
• 卷：52
• 期：6
• 页码：1981-1996
• 全文大小：701 K

文摘

While the antiaromatic tetraoxa[24]porphyrinogen(2.2.2.2) 1 (trans,cis,trans,cis) and the corresponding aromatic dication 1²⁺ have been published recently, the synthesis of the title compounds is described for the first time. Beside the cis,trans,cis,trans-tetraoxa[24]porphyrinogen(4.0.4.0) 2b the isomeric porphyrinogens 2a (trans, cis,cis,trans) and 2c (all-trans in the cisoid conformation) could be isolated. The tetraoxa[22] porphyrin(4.0.4.0) dication is an aromatic 22π-system, it exists only in the cis,trans,cis,trans-configuration. The dication 2b²⁺ can be reduced with tetrakis-N,N-dimethylaminoethene to give pure porphyrinogen 2b. The electrochemistry of the system 2/2b²⁺ and AM1 calculations are described.