Influence of sulfur groups on carboxylic acid strengths
作者:Erwin Boschmann、Roger D. Miller
DOI:10.1016/j.tet.2018.04.007
日期:2018.5
The relative acid strength for a series of monocarboxylic acids of the general formula RX(CH2)nCOOH and related dicarboxylic acids of the general formula HOOC(CH2)nX(CH2)nCOOH, where R = Ph or Me, X = CH2, S, SO, or SO2; and n = 1 or 2 as appropriate; have been studied as a function of X. It is found that sulfur containing acids have lower pKa values than the corresponding carbon analogues, that the
一系列通式R X (CH 2)n COOH的一元羧酸和通式HOOC (CH 2)n X (CH 2)n COOH的相关二元羧酸的相对酸强度,其中R = Ph或Me X = CH 2,S ,SO或SO 2;n = 1或2(视情况而定);已经研究了作为X的函数。发现含硫的酸具有比相应的碳类似物更低的pKa值,对于硫代酸而言,pK a最高,对于磺酰基酸而言,pK a最低。s随着n的增加而增加,而对于二元羧酸体系,只有硫原子在n从1变为2时pK a(2)– pK a(1)差异显着降低。
Antisymbiosis. Preferential coordination of anionic oxygen versus neutral sulfur donor atoms of methylsulfanyl- or methylsulfinyl-acetato, 2-benzoato and 2-phenolato to the cis-PtII(PPh3)2 and PtII(dppe) residues
tetramethylthiourea. Substitution of L’s occurs with N,N′-diethyldithiocarbamate, which forms a very stable chelate with Pt(II). Thiourea and N,N′-dimethylthiourea also react, because they give rise to cyclometallated products [Pt(phos)2(NRC(S)NHR)]+ (R = H, CH3), with one ionised thioamido group, as revealed by an X-ray investigation of [Pt(PPh3)2(NHC(S)NH2)]+. The preference of O versusS coordination, as well as
[EN] COMPOUNDS AND COMPOSITIONS FOR INTRACELLULAR DELIVERY OF THERAPEUTIC AGENTS<br/>[FR] COMPOSÉS ET COMPOSITIONS D'ADMINISTRATION INTRACELLULAIRE D'AGENTS THÉRAPEUTIQUES
申请人:MODERNATX INC
公开号:WO2018170306A1
公开(公告)日:2018-09-20
The disclosure features novel lipids and compositions involving the same. Nanoparticle compositions include a novel lipid as well as additional lipids such as phospholipids, structural lipids, and PEG lipids. Nanoparticle compositions further including therapeutic and/or prophylactics such as RNA are useful in the delivery of therapeutic and/or prophylactics to mammalian cells or organs to, for example, regulate polypeptide, protein, or gene expression.
Isomerization of the dimethyl sulfoxide radical cation and the possible analogies to the neutral species
作者:Lars. Carlsen、Helge. Egsgaard
DOI:10.1021/ja00228a016
日期:1988.9
Etude de l'interconversion des radicaux cationiques du DMSO, de l'aci-DMSO, et du methanesulfenate de methyle par spectrometrie de masse avec activation par collisions et etudes des ions metastables
Etude de l'interconversion des radicaux cationiques du DMSO, de l'aci-DMSO, et du methanesulfenate demethyle par spectrometrie de masse avec 激活 par 碰撞练习曲des 离子亚稳态
7.alpha.-Methoxycephalosporin derivatives
申请人:Asahi Kasei Kogyo Kabushiki Kaisha
公开号:US04229573A1
公开(公告)日:1980-10-21
Novel 7.alpha.-methoxycephalosporin derivatives having a high antimicrobial activity. They are useful for the medical treatment of diseases infected by gram-positive bacteria and gram-negative bacteria. More particularly, they show an antimicrobial activity against bacteria such as Eschericha coli Proteus, Citrobacter and Enterobacter which bacteria have resistance to the conventionally employed cephalosporins, and they are effective for the medical treatment of diseases infected by these bacteria. Such 7.alpha.-methoxycephalosporin derivatives are prepared by a relatively simple method.