Organocations in Zeolite Synthesis: Fused Bicyclo [<i>l</i>.<i>m</i>.0] Cations and the Discovery of Zeolite SSZ-48
作者:Greg S. Lee、Yumi Nakagawa、Son-Jong Hwang、Mark E. Davis、Paul Wagner、Larry Beck、Stacey I. Zones
DOI:10.1021/ja011513o
日期:2002.6.1
A set of zeolite synthesis experiments is described where lattice substitution is varied in the context of the structure of particular structure-directing organocations (at times referred to as templates). In this particular series, the organocations are constructed as members of a fused bicyclo organonitrogen class of compounds, described as having ring construction [l.m.n], where n = 0. We show that
描述了一组沸石合成实验,其中晶格取代在特定结构导向有机阳离子(有时称为模板)的结构背景下发生变化。在这个特定系列中,有机阳离子被构建为稠合双环有机氮类化合物的成员,描述为具有环结构 [lmn],其中 n = 0。我们表明这些化合物可以最好地从转化的起始环酮中获得通过贝克曼重排反应生成亚胺。贝克曼反应的一种特殊方法在我们手中效果最好。在某些情况下,制备和分离异构有机阳离子。通常它们在沸石合成中的使用会产生不同的产品。客体有机阳离子的空间填充细节与合成中开发的晶格类型具有高度相关性。在涉及十氢喹啉衍生物异构体的一个实例中,发现了一种新的沸石 SSZ-48,它仅包含一种异构体。异构体的表征及其在沸石中的用途之后是 (13) C MAS NMR 分析。给出了新沸石的一些细节,并表明在与 SSZ-48(一种 12 环沸石)相似的条件下,可以产生预测 14 环沸石的合理对称操作。异构体的表征及其在沸石中的用途之后是
TRIAZOLE DERIVATIVES FOR TREATING ALZHEIMER'S DISEASE AND RELATED CONDITIONS
申请人:Fischer Christian
公开号:US20100222320A1
公开(公告)日:2010-09-02
Compounds of formula I: Selectively attenuate production of Aβ(1-42) and hence find use in treatment or prevention of diseases associated with deposition of Aβ in the brain, in particular Alzheimer's disease.
Guest/Host Relationships in the Synthesis of the Novel Cage-Based Zeolites SSZ-35, SSZ-36, and SSZ-39
作者:Paul Wagner、Yumi Nakagawa、Greg S. Lee、Mark E. Davis、Saleh Elomari、Ronald C. Medrud、S. I. Zones
DOI:10.1021/ja990722u
日期:2000.1.1
Here, we report the synthesis and structure of three high-silica molecular sieves, SSZ-35, SSZ-36, and SSZ-39, that are prepared from a library of 37 different cyclic and polycyclic quaternized amine molecules that are used as structure-directing agents (SDAs). The size and shape of the quaternized amine molecules are purposely designed in order to obtain novel zeolite structures, and the synthesis of these molecules is presented. The selectivity for the three molecular sieve phases is found to depend on both the SDA and the degree of heteroatom lattice substitution of Al3+ or B3+ in the silicate framework. Molecular modeling is utilized to probe the effects of the nonbonded SDA/zeolite-framework interaction energy on the selectivity for the observed molecular sieve phase. The Rietveld refinement of the powder X-ray data confirms the structure of the SSZ-39 zeolite to be isomorphous with the aluminophosphate molecular sieve, SAPO-LS (AEI). The structure of SSZ-36 is found to possess a range of fault probabilities between the two-dimensional channel system, end-member polymorphs, ITQ-3 and RUB-13 (International Zeolite Association Codes ITE and RTH, respectively). The SSZ-35 structure is reported to contain a one-dimensional pore system possessing stacked cages circumscribed by alternating rings of 10 and 18 tetrahedral atoms (10- and 18-membered rings).