Abstract Two series of novel ammonium salts containing the quinuclidine moiety were prepared in order to evaluate their antioxidative, antibacterial and antifungal potential. The synthesized homologues of 3-hydroxy (QOH) and 3-chloroquinuclidine (QCl) with the different N-benzyl substituents at the para-position (bromo, chloro or nitro group) were obtained in very good yields and characterized by IR
摘要 为了评价其抗氧化、抗菌和抗真菌潜力,制备了两个系列含有奎宁环部分的新型铵盐。合成的 3-羟基 (QOH) 和 3-氯奎宁环 (QCl) 的同系物在对位(溴、氯或硝基)具有不同的 N-苄基取代基,收率非常好,并通过 IR 和 NMR 光谱表征和元素分析。使用氧自由基吸收能力 (ORAC) 测定法测试了所有化合物的抗氧化活性,在测试样品中,Np-硝基苄基-3-羟基奎宁环溴化物 (QOH-4) 表现出最高的抗氧化潜力 (293.80 nmol (TE) mL-1) ,这通过 DNA 切口测定进一步研究。通过测量抑菌圈和测定对三种革兰氏阳性菌(蜡状芽孢杆菌、粪肠球菌和金黄色葡萄球菌)、三种革兰氏阴性菌( E. coli、P. aeruginosa 和 C. sakazakii)和三种真菌(C. albicans、A. niger 和 P. notatum)。生物活性测定表明,一些新合成的季铵盐化合物显示出与庆大霉素
Process for preparing low-odor and storage-stable monomer-containing polyisocyanurates from isophorone diisocyanate
申请人:Degussa AG
公开号:US20020022726A1
公开(公告)日:2002-02-21
The present invention provides a process, which includes:
partially trimerizing isophorone diisocyanate in the presence of a catalyst having the formula:
[R—NX
3
]
⊕
Y
⊖
wherein R and X are butyl groups and Y
−
is CH
3
COO
−
; or
wherein R is a benzyl group, Y
−
is a carboxylate anion having from 4 to 8 carbon atoms and each X is an alkylene group having from 2 to 3 carbon atoms, wherein the three alkylene groups share a common carbon atom and, together with the N atom in the formula, form a tricyclic structure, and wherein at least one alkyene group has at least one OH group in an &agr; or &bgr; &ggr; position relative to the N atom,
to obtain a monomer-containing polyisocyanurate mixture. The present invention also provides a monomer-containing polyisocyanurate mixture made from the above process.
The Al location in zeolites can have massive influences on the zeolite properties because it directly correlates with the cationic active sites. Herein, the synthesis of IFR zeolites with controlled Al distribution at different tetrahedral sites (T sites) is reported. The computational calculations suggest that organic structure‐directing agents (OSDAs) used for zeolite synthesis can alter the energetically