Bond Rotation in an Aromatic Carbaporphyrin: Allyliporphyrin

作者：Hong Jung Ho; Aslam Adil S; Ko Min Sung; Choi Jonghoon; Lee Yunho; Cho Dong Gyu^*

来源：Chemistry - A European Journal, 2018, 24(40): 10054-10058.

DOI：10.1002/chem.201802176

• allyliporphyrin
• aromaticity
• carbaporphyrin
• heterocycles
• porphyrins

Allyliporphyrin is a carbaporphyrin that has replaced one pyrrole with an allyl group. Dynamic behavior (bond rotation) was observed by variable temperature (HNMR)-H-1 and 2D-NOESY NMR spectroscopy and theoretically examined by DFT calculations. These studies revealed that well-defined bond rotation was first observed in the limited space of the carbaporphyrin from 2 through cis-2 and the calculated rotational barrier was low enough, with the relative energy level of cis-2 only 0.65kcalmol(-1) higher than 2. The synthesized allyliporphyrin(2) is a strongly aromatic macrocycle as indicated by the chemical shifts of its inner NH and CH signals. However, its palladium complex displayed reduced aromaticity due to the tilted thiophene of Pd-2.

• 出版日期2018-7-17