79945-46-3Relevant academic research and scientific papers
Organic solvent controlling the oxidativity of potassium permanganate
Zheng, Min-Yan,Wei, Yong-Sheng,Fan, Guang,Huang, Yi
experimental part, p. 161 - 164 (2012/08/27)
It has been discovered that potassium permanganate can be a homogenous weak oxidant in organic solvent without the addition of water. If acetone is employed as the only solvent, among some common organic substrates included alkenes, alcohols, arenes, aldehydes and phenols, secondary alcohols are converted to the corresponding ketones and aldehydes to the corresponding acid. Compared with oxidation reaction of potassium permanganate in water, in anhydrous acetone system, potassium permanganate as a weaker oxidant has no influence on the alkyls in benzene rings, double bonds and so on. So potassium permanganate can exhibit selectivity by solvent controlling. Especially, when aldehydes are oxidized, the oxidation process is a green organic reaction for nearly all coproducts and solvent can be recycled.
Nematic phases of bent-core mesogens
Keith, Christina,Lehmann, Anne,Baumeister, Ute,Prehm, Marko,Tschierske, Carsten
body text, p. 1704 - 1721 (2011/10/19)
Bent-core mesogens derived from 4-cyanoresorcinol with terminal alkyl chains have been synthesized and investigated by polarizing microscopy, XRD and electro-optical methods. Short chain compounds have exclusively nematic phases which can be cooled to ambient temperature. These nematic phases are similar to ordinary nematic phases with only nearest neighbour correlation (N) whereas long chain compounds form SmC-type cybotactic clusters and these cybotactic nematic phases (NcybC) can be regarded as strongly fragmented SmC phases. The chain length dependent as well as temperature dependent structural transition from N to NcybC is continuous and associated with a change of the position and intensity of the small angle scattering in the XRD patterns. Moreover, a temperature dependent stepwise transition from cybotactic nematic phases to different types of non-polar and tilted smectic phases (SmC (I) and SmC(II)) is observed with a mesophase composed of elongated, but not yet fused cybotactic clusters (CybC) as an intermediate state of this transition. This improves the understanding of the nature and special properties of the nematic phases formed by bent-core molecules as well as their transition to smectic phases and it paves the way to new materials with spontaneous or field-induced biaxial nematic phases at ambient temperatures.
