<sup>19</sup>F nuclear magnetic resonance studies of aromatic compounds. Part IV. Transmission of substituent effects across two aromatic rings connected by an N–N linkage
作者:Peter J. Mitchell、Lawrence Phillips
DOI:10.1039/p29740000109
日期:——
occur by modification of the repulsive interaction between the non-bonding lonepairs on the interconnecting nitrogen atoms. Support for this suggestion is given by observation of long range (11 bond) coupling between fluorine nuclei in n.m.r. spectra of the 4,4′-difluoro-members of the ‘transmission’ series and its absence in the spectra of the corresponding members of the ‘relay’ series. A recent examination
描述了几种类型的p -FC 6 H 4 ·Z·C 6 H 4 X类型的双核芳族化合物的合成[省略图示]。在19个˚Fnmrspectra被用于检查的取代基影响的传输,由于基团X,过桥Z.有必要“传输”(在区分反偶氮-和氧化偶氮基系列),其中电子密度可能是从一个环转移到另一个环并“中继”(顺-偶氮和-偶氮系列,以及偶氮系列),其中取代作用最可能是通过修饰相互连接的氮原子上非键合孤对之间的排斥相互作用而发生的。通过观察“透射”系列的4,4'-二氟成员的核磁共振谱中的氟核之间的长距离(11键)偶联,以及在其相应成员的谱中不存在氟核之间的长距离(11键)偶联,为这一建议提供了支持。 “继电器”系列。讨论了对最近的一些类似系列的长距离取代基效应的研究,并对结果进行了重新评估。在某些4-取代的苯乙烯衍生物中,对13 C和1 H nmr屏蔽数据进行了类似的处理。
HERPES VIRUS-BASED COMPOSITIONS AND METHODS OF USE IN THE PRENATAL AND PERINATAL PERIODS
申请人:THE UNIVERSITY OF ROCHESTER
公开号:EP1903873A2
公开(公告)日:2008-04-02
Pesticidal compositions and methods
申请人:Hresko Coutu Michelle
公开号:US20050203067A1
公开(公告)日:2005-09-15
Certain chemical analogs and related compounds useful in the control nematodes that infest plants or the situs of plants are described. Nematodes that parasitize animals can also be controlled using the methods and compounds of this invention.
Methods to accelerate the isolation of novel cell strains from pluripotent stem cells and cells obtained thereby
申请人:West D. Michael
公开号:US20080070303A1
公开(公告)日:2008-03-20
This invention generally relates to methods to differentiate pluripotent stem cells, such as embryonic stem, embryonic germ, or embryo-derived cells, to obtain subpopulations of cells from heterogeneous mixtures of cells wherein the subpopulation of cells possess reduced differentiation potential compared to the original pluripotent stem cells and where the subpopulation is capable of being propagated.
Herpes Virus-Based Compositions and Methods of Use in the Prenatal and Perinatal Periods
申请人:Federoff Howard J.
公开号:US20080226601A1
公开(公告)日:2008-09-18
Disclosed are compositions and methods for reducing the severity of a birth defect in a mammal by exposing the mammal (e.g., in utero) to a herpes virus amplicon particle comprising a cis element-flanked transgene and a sequence encoding a transposase. Upon expression, the transposase inserts the transgene into the genome of a cell (e.g., a neuron) within the mammal and the transgene expresses a polypeptide or RNA that compensates for a protein or gene defect that is causally associated with the birth defect.