Sterically demanding imidazolinium salts through the activation and cyclization of formamides
作者:Michael Tsimerman、Debasis Mallik、Tsukasa Matsuo、Takashi Otani、Kohei Tamao、Michael G. Organ
DOI:10.1039/c2cc36329a
日期:——
A new protocol was developed for the synthesis of sterically demanding imidazolinium salts. This procedure was adopted for the synthesis of seven NHC salts, including ones that were demonstrated to be inaccessible using the conventional orthoformate ester type cyclization method.
A series of octa-R-substituted bromo-s-hydrindacenes, “Rind-Br,” have been synthesized by a sequence of the Lewis acid catalyzed intramolecular Friedel–Crafts reaction, bromination and vice versa. Their structural features and physical properties depend on the eight R-substituents at the four benzylic positions on the s-hydrindacenyl skeleton. The molecular structures of the Rind-Br have been confirmed by X-ray crystallography, indicating the unique structural diversities of the bulky Rind groups.
Rational Design of Persistent Phosphorus-Centered Singlet Tetraradicals and Their Use in Small-Molecule Activation
作者:Edgar Zander、Jonas Bresien、Vladimir V. Zhivonitko、Johannes Fessler、Alexander Villinger、Dirk Michalik、Axel Schulz
DOI:10.1021/jacs.3c03928
日期:2023.7.5
alkynes. In addition to the synthesis of P-centered tetraradicals, the comparison with other known tetraradicals as well as biradicals is described on the basis of quantum mechanical calculations with respect to its multireference character, coupling of radical electrons, and aromaticity. The strong coupling of radical electrons enables selective discrimination between the first and the second activations