the MeOH ratio that is present as cosolvent, different coordination sites are involved leading to complexes I-III, each one with a characteristic structure (tri-, bi-, unipodal) and associated helical state. This dynamic coordination allows the selective modification of the helical sense or the stretching/compression backbone of a helical polymer.
Dissymmetric Chiral Poly(diphenylacetylene)s: Secondary Structure Elucidation and Dynamic Luminescence
作者:Juan José Tarrío、Rafael Rodríguez、Berta Fernández、Emilio Quiñoá、Félix Freire
DOI:10.1002/anie.202115070
日期:2022.2.21
adopted by a non-symmetric substituted poly(diphenylacetylene) (PDPA) is elucidated, and its ability to self-assemble into nanospheres or fiber-like structures under the right conditions is also demonstrated. Moreover, by conformational changes in the pendant group it is possible to produce a helix inversion in the PDPA and create a circular polarized luminescence (CPL) switch.
阐明了非对称取代聚二苯乙炔 (PDPA) 采用的 3D 螺旋结构,并证明了其在适当条件下自组装成纳米球或纤维状结构的能力。此外,通过侧基的构象变化,可以在 PDPA 中产生螺旋反转并产生圆偏振发光 (CPL) 开关。
Late‐Stage Peptide Diversification through Cobalt‐Catalyzed C−H Activation: Sequential Multicatalysis for Stapled Peptides
作者:Mélanie M. Lorion、Nikolaos Kaplaneris、Jongwoo Son、Rositha Kuniyil、Lutz Ackermann
DOI:10.1002/anie.201811668
日期:2019.2.4
of structurally complexpeptides has enormous potential for drug discovery and molecular imaging. In recent years, transition‐metal‐catalyzed C−H activation has emerged as an increasingly viable tool for peptide modification. Despite major accomplishments, these strategies largely rely on expensive palladium catalysts. We herein report an unprecedented cobalt(III)‐catalyzed peptide C−H activation,
A manganese(<scp>i</scp>)tricarbonyl-catalyst for near room temperature alkene and alkyne hydroarylation
作者:Shweta Choudhary、Diego M. Cannas、Matthew Wheatley、Igor Larrosa
DOI:10.1039/d2sc04295a
日期:——
We have rationally designed a new Mn(I)-catalyst for hydroarylation reactions that displays much improved catalytic activity over the commonly used MnBr(CO)5. Our catalyst, MnBr(CO)3(MeCN)2, avoids the formation of the off-cycle manganacycle-(CO)4 species responsible for low catalyst activity, allowing near roomtemperaturehydroarylation of alkenes and alkynes with broad functional group tolerance including