253284-70-7Relevant academic research and scientific papers
Bond Rotation in an Aromatic Carbaporphyrin: Allyliporphyrin
Hong, Jung-Ho,Aslam, Adil S.,Ko, Min-Sung,Choi, Jonghoon,Lee, Yunho,Cho, Dong-Gyu
supporting information, p. 10054 - 10058 (2018/07/29)
Allyliporphyrin is a carbaporphyrin that has replaced one pyrrole with an allyl group. Dynamic behavior (bond rotation) was observed by variable temperature 1H NMR 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 0.65 kcal mol?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.
Rhodium-catalyzed vinylcyclopropanation/cyelopentenation of strained alkenes via a sequential carborhodation process
Tseng, Nai-Wen,Lautens, Mark
supporting information; experimental part, p. 2521 - 2526 (2009/08/07)
A rhodium-catalyzed reaction of dienylboronate esters with alkenes is described. Strained bicyclic alkenes show the highest reactivity toward the rhodium-catalyzed addition of the dienylboronate esters. Depending on the substitution pattern of dienylboron
Synthesis of isocoumarins and α-pyrones via palladium-catalyzed annulation of internal alkynes
Larock, Richard C.,Doty, Mark J.,Han, Xiaojun
, p. 8770 - 8779 (2007/10/03)
A number of 3,4-disubstituted isocoumarins and polysubstituted α- pyrones have been prepared in good yields by treating halogen- or triflate- containing aromatic and α,β-unsaturated esters, respectively, with internal alkynes in the presence of a palladiu
