Facile and Fast Pinacol Rearrangement by AlCl3 in the Solid State

A facile and efficient synthetic procedure for effecting the pinacol rearrangement catalyzed by AlCl3 in the absence of solvent is developed. The rearrangement product is obtained at room temperature in a few minutes and in almost quantitative yield. Benzylic pinacols rearrange under these conditions, while aliphatic pinacols do not react

Selective ipso-Nitration of tert-Butylcalix[4]arene Tripropylether

An improved selective ipso-nitration of the tripropoxy derivative of tertbutylcalix[4]arene at the upper rim is described. The synthesized products are key intermediates for construction of molecular receptors based on calixarenes

Selective ipso-Nitration of tert-Butylcalix[4]arene Tripropylether

An improved selective ipso-nitration of the tripropoxy derivative of tertbutylcalix[4]arene at the upper rim is described. The synthesized products are key intermediates for construction of molecular receptors based on calixarenes

The Laplacian of Electron Density versus NICS_<i>zz</i> Scan: Measuring Magnetic Aromaticity among Molecules with Different Atom Types

The electron density versus NICS_<i>zz</i> (the out-of-plane component of nucleus-independent chemical shifts (NICS)) scan for assessing magnetic aromaticity among similar molecules with different ring sizes is improved by scanning the Laplacian of electron density versus NICS_<i>zz</i> to include molecules containing different types of atoms. It is demonstrated that the new approach not only reproduces the results of the previous method but also surpasses that in the case of species with different atom types. The relative positions of curves in the plots of the Laplacian of electron density versus NICS_<i>zz</i> correlate well with the ring current intensities of these molecules both near and far from the ring planes of the considered molecules. Accordingly, relative magnetic aromaticity of a number of planar hydrocarbons and a group of double aromatic metallic/semimetallic species are studied and discussed

Synthesis of Aromatic Vinyl Esters by Exchange Reaction Catalyzed with Pd(II)

Pd(II) catalyzed the exchange reaction of vinyl acetate with aromatic acids to produce the corresponding vinyl esters in good yields