Compounds comprising sulfated nonulonic acid having antiviral activity
申请人:Nissan Food Products Co., Ltd.
公开号:US06337390B1
公开(公告)日:2002-01-08
In order to provide the anti-retrovirus active compound with low anti-coagulant action and low cytotoxicity, compounds comprising glycoside or the salt thereof wherein lipid is linked to position 2 of sialic acid having all hydroxyl groups at positions 4, 7, 8 and 9 completely sulfated, or KDN (2-keto-3-deoxy-D-glycero-2-nononic acid) having all hydroxyl groups at positions 4, 5, 7, 8 and 9 completely sulfated are provided.
Crystalline structure and phase behavior of N-alkylated polypyrrole comb-like polymers
作者:Haixia Wang、Xu Han、Haifeng Shi、Xingxiang Zhang、Lu Qi、Dujin Wang
DOI:10.1039/c4ce00722k
日期:——
We report the crystalline structure and phase behavior of a series of comb-like polymers (PPy-Cn), which were prepared via N-alkylation reactions between a pyrrole monomer and n-alkyl bromides (n = 18–26). Analysis by temperature-dependent X-ray diffraction and Fourier transform infrared spectroscopy (FTIR), as well as differential scanning calorimetry reveals that the crystal structure, thermal events and packing mode are affected by PPy backbones, which exhibit stronger rigidity than those of previously reported comb-like polymers. Remarkably, variable-temperature (VT)-FTIR proves the formation of orthorhombic phase at very low temperature, while VT-wide-angle X-ray diffraction only presents the hexagonal phase, illustrating that FTIR is a very sensitive tool for analyzing the micro-packing mode of molecular chains. The enhanced side-chain crystallizable carbon atoms indicate that PPy polymeric backbones play a negative role in the regular packing of nano-crystallites formed by alkyl groups.
Phosphotungstic anion-paired quinoline salt for heterogeneous photocatalytic hydroxylation of benzene to phenol with air
作者:Lingyu Zhang、Qian Hou、Yu Zhou、Jun Wang
DOI:10.1016/j.mcat.2019.110397
日期:2019.8
exhibited high yield (20.9%) and selectivity (> 99%) in the benzene hydroxylation to phenol by using atmospheric air as the sole oxidant. The activity of the IL-POM hybrid is even higher than the quinoline salt precursor, thanks to the unique redox property of PW anions that promotes the generation, separation and transport of photoinduced carriers. After reaction, the catalyst was facilely reused with stable