Selective Cycloaddition of Tetracyanoethene (TCNE) and 7,7,8,8‐Tetracyano‐
<i>p</i>
‐quinodimethane (TCNQ) to Afford
<i>meso</i>
‐Substituted Phenylethynyl Porphyrins
作者:Dominik Koszelewski、Agnieszka Nowak‐Król、Daniel T. Gryko
DOI:10.1002/asia.201200179
日期:2012.8
π‐Extended TCBD‐porphyrins that contained a 1,1,4,4‐tetracyanobuta‐1,3‐diene unit were prepared by a highly efficient [2+2] cycloaddition of tetracyanoethene (TCNE) or 7,7,8,8‐tetracyano‐p‐quinodimethane (TCNQ) with meso‐substituted trans‐A2B2‐porphyrins that contained two phenylethynyl groups, followed by a retro‐electrocyclization reaction. Depending on the electronic properties of the arylethynyl
通过高效[2 + 2]四氰基乙烯(TCNE)或[7,7,8,8]的环加成反应制备包含1,1,4,4-四氰基uta-1,3-二烯单元的π-扩展的TCBD-卟啉。具有内消旋取代的反式A 2 B 2的四氰基对喹啉甲烷(TCNQ)含有两个苯基乙炔基的卟啉,随后发生逆电环化反应。取决于芳基乙炔基的电子性质,环加成反应仅在一个或两个乙炔基部分上以高收率进行。加入TCNQ具有完全的区域选择性。所得的π扩展TCBD卟啉具有一个变色的Soret带,并在可见光区显示出独特而宽泛的吸收。