Abstract It is well known that, under certain conditions, C( sp 3 ) atoms behave, via their ?-hole, as Lewis acids in tetrel bonding. Here, we show that methyl groups, when bound to less electronegative than carbon, can counterintuitively participate noncovalent interactions electron density donors. Thousands of experimental structures are found which groups behave bases establish alkaline, alk...

the glass transition temperature of several pvac(1)-b-poly(ma-co-mma) (2) terpolymers with different fractions of methyl acrylate (ma) and methyl methacrylate (mma) repeating units in random copolymer (block 2) were calculated with barton, kwei and topological equations. the calculation was on the basis of the correlation between the fraction of repeating units in random copolymers and theoreti...

The formation of the methyl groups of methionine and choline from C”-labeled formate has been demonstrated in the intact rat (1-3) and in rat liver slices (1). Du Vigneaud and his coworkers (’2) have also shown the incorporation of the carbon of formaldehyde into the methyl groups of choline. It is conceivable that in rat liver the carbon of formate or formaldehyde is first incorporated into th...

conformational properties of n-aryl-1-azacyclooctan-5- ones with a p-methyl, m-methyl, and p-methoxy group as a substituent have been studied by 1h-nmr, 13c-nmr and ir spectroscopies. transannular interaction of the two functional groups have been examined from the ring inversion barriers and the carbonyl vibrational frequencies with reference to the corresponding data of the respective monofun...