Peculiarities of the crystal packing of n-alkyl side chain ureas—precursors in the synthesis of helical polycarbodiimides
摘要:
We report here the single-crystal X-ray diffraction data collected for 10 ureas bearing alkyl side chains precursors in the synthesis of chiral polycarbodiimides. X-ray data obtained could be used in constructing the model of interacting polymer chains (e.g., n-hexyl, n-heptyl, n-octyl, n-nonafluoropentyl, and n-hep-tadecafluorononyl). TGA/DSC studies confirmed relative stability of the ureas inspected. It seems probable that interdigitation pattern found in a crystal lattice of the aliphatic ureas mimics the organization of polycarbodiimide macromolecules identifiable by microscopy techniques (C) 2015 Elsevier Ltd. All rights reserved.
An Air-Stable Nickel(0) Phosphite Precatalyst for Primary Alkylamine C-N Cross-Coupling Reactions
作者:Sven S. Kampmann、Brian W. Skelton、Duncan A. Wild、George A. Koutsantonis、Scott G. Stewart
DOI:10.1002/ejoc.201500734
日期:2015.9
preparation of a new air-stablenickelphosphite based catalyst for unique C–N bond forming processes. Specifically, (BINAP)Ni[P(OPh)3]2, is presented as an effective catalyst for a range of amination reactions between aryl halides and primaryalkylamines. The results are supported by relevant kinetic studies, DFT calculations and a catalytic cycle indicating possible reaction intermediates.