Syntheses and polymerisation of methyl 12‐ and 18‐vinyloxystearates

Abstract

Methyl 12-and 18-vinyloxystearates were prepared by vinyl transetherscation with ethyl vinyl ether. Stannic chloride initiated cationic polymerisation of these monomers in cyclohexane yielded colourless viscous liquids having a degree of polymerisation of about 20. The ester groups in the polymers Were hydrolysed to give the corresponding polyacids and were reduced to give the corresponding polyols. ZUSAMMENFASSUNG: 12-und 18-Vinyloxystearinsauremethylester w d e n durch Umatherung mit Athylvinylather hergestellt und mit Zinnchlorid (SnCh) kationisch polymerisiert. Die polymeren Produkte waren farblose, viskose Fliissigkeiten mit einem Polymerisationsgad von etwa 20. Die Polymeren wurden entweder zu den entsprechenden Polysauren hydrolysiert oder zu den entsprechenden Polyalkoholen reduziert.

Interpreting geometric preferences in π‐stacking interactions through molecular orbital analysis

“…This intuitive bonding model for p-stacking interactions is complementary to highly accurate calculations of p-stacking energies and allows a predictive understanding of relative stability using cheaper quantum chemical methods. K E Y W O R D S density functional theory, molecular orbital theory, non-covalent interactions, p-stacking interactions 1 | I N TR ODU C TI ONNon-covalent p-stacking interactions are important for biomolecules, [1][2][3] self-assembly and crystal engineering, [4][5][6] organic electronics, [7] biological recognition motifs, [8,9] and rational drug design. [10] X-ray crystallography shows that many aromatic molecules form parallel displaced (PD) stacks, with planes separated by distances of 3.3-3.6 Å.…”