Reference of 250285-32-6, Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 250285-32-6, C27H37ClN2. A document type is Article, introducing its new discovery.
Estimation of sigma-Donation and pi-Backdonation of Cyclic Alkyl(amino) Carbene-Containing Compounds
Herein, we present a general method for a reliable estimation of the extent of pi-backdonation (CcAAC?E) of the bonded element (E) to the carbene carbon atom and CcAAC?E sigma-donation. The CcAAC?E pi-backdonation has a significant effect on the electronic environments of the 15N nucleus. The estimation of the pi-backdonation has been achieved by recording the chemical shift values of the 15N nuclei via two-dimensional heteronuclear multiple-bond correlation spectroscopy. The chemical shift values of the 15N nuclei of several cAAC-containing compounds and/or complexes were recorded. The 15N nuclear magnetic resonance chemical shift values are in the range from -130 to -315 ppm. When the cAAC forms a coordinate sigma-bond (CcAAC?E), the chemical shift values of the 15N nuclei are around -160 ppm. In case the cAAC is bound to a cationic species, the numerical chemical shift value of the 15N nucleus is downfield-shifted (-130 to -148 ppm). The numerical values of the 15N nuclei fall in the range from -170 to -200 ppm when sigma-donation (CcAAC?E) of cAAC is stronger than CcAAC?E pi-backacceptance. The pi-backacceptance of cAAC is stronger than sigma-donation, when the chemical shift values of the 15N nuclei are observed below -220 ppm. Electron density and charge transfer between CcAAC and E are quantified using natural bonding orbital analysis and charge decomposition analysis techniques. The experimental results have been correlated with the theoretical calculations. They are in good agreement.
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Chiral Catalysts,
Chiral catalysts – SlideShare