Chemical Synthesis and Self-Assembly of a Ladderane Phospholipid
作者:Jaron A. M. Mercer、Carolyn M. Cohen、Steven R. Shuken、Anna M. Wagner、Myles W. Smith、Frank R. Moss、Matthew D. Smith、Riku Vahala、Alejandro Gonzalez-Martinez、Steven G. Boxer、Noah Z. Burns
DOI:10.1021/jacs.6b10706
日期:2016.12.14
producing organism and the inherent difficulty of purifying complex lipid mixtures have prohibited isolation of useful amounts of natural ladderane lipids. We have devised a highly selective total synthesis of ladderane lipid tails and a full phosphatidylcholine to enable biophysical studies on chemically homogeneous samples of these molecules. Additionally, we report the first proof of absolute configuration
Rate constants for the reactions of CN with C6–C8 unsaturated hydrocarbons: the relations between the reaction rates and the molecular lengths
作者:Tomoki Ochimizu、Kanekazu Seki、Mikio Yagi、Joshua B. Halpern、Hideo Okabe
DOI:10.1016/s0009-2614(99)00962-8
日期:1999.11
Rates of CN reactions with 1,3,5-hexatriene and three octadiynes have been measured at various sample pressures using laser-induced fluorescence of the CN radical. The rateconstants are, in units of cm3 molecule−1 s−1, k1,3,5-hexatriene=(6.7±0.2)×10−10, k1,7-octadiyne=(3.5±0.3)×10−10, k2,6-octadiyne=(2.4±0.3)×10−10 and k3,5-octadiyne=(2.5±0.3)×10−10, respectively. It shows clearly that two factors
Carbene-carbene rearrangements as a route to 1,5-dihydropentalene
作者:Udo H. Brinker、Ilona Fleischhauer
DOI:10.1016/0040-4020(81)80016-6
日期:1981.1
adducts of 4, 5a and 5b were obt in the reaction with perfluorobut-2-yne. The formation of 1,5-dihydropentalene 4 is explained by a double ring expansion sequence involving consecutive carbene-carbenerearrangements with 1,3-carbon and subsequent 1,2-hydrogen shifts, supported by the reaction of double labelled (13C-depleted) 3. From readily available 3 at low temperatures formation and fusion of two
在-40°C下用甲基锂处理反式-1,2-双(2,2-二溴环丙基)乙烯3时,形成1,5-二氢戊烯(4)作为主要产物。另外,该反应提供了1-和2-丙二烯基环戊二烯(5a)和(5b),以及反式-1,2,4,6,7-八碳烯(6),新的C 8 H 8异构体。的狄尔斯-阿德耳加成物4,图5a和图5b中与perfluorobut -2-炔反应是OBT。1,5-二氢戊烯的形成4由双环扩展序列解释,该序列涉及具有1,3-碳的连续卡宾-卡宾重排以及随后的1,2-氢转移,由双标记(贫13 C)3的反应支持。在一个步骤中,由容易获得的3在低温下形成并形成两个5元环。
Some new dienophiles in the diels-alder reaction with active cyclic dienes
A comparative study of the Diels-Alderreaction have been carried out for three types of cyclic dienes: cyclopentadiene (CPD), hexachlorocyclopentadiene (HCP), and tetrachloro-1,2-benzoquinone (TCBQ) with dienophiles of five types: monosubstituted acetylenes (propargyl alcohol and its esters), conjugated amines (allyl acetylene, allyl ethynyldimethylcarbonol and its esters), conjugated dienes (2-methylhexadiene-3
已对三种类型的环状二烯进行Diels-Alder反应的比较研究:环戊二烯(CPD),六氯环戊二烯(HCP)和四氯-1,2-苯醌(TCBQ)与五种亲二烯体:单取代乙炔(炔丙醇及其酯),共轭胺(烯丙基乙炔,烯丙基乙炔基二甲基碳醇及其酯),共轭二烯(2-甲基己二烯-3,5-ol-2及其酯,1-乙氧基和1-乙氧基羰基丁二烯-1,3 )和共轭三烯(hexatriene-1,3,5 and 5-methylhexatriene-1,3,5)。
Some reactions of tricarbonyl(η-hexa-1,3,5-triene)iron(<scp>0</scp>)
作者:Brian F. G. Johnson、Jack Lewis、David G. Parker、S. Roderick Postle
DOI:10.1039/dt9770000794
日期:——
with nonacarbonyldi-iron(0), and some reactions of the unto-ordinated olefinic residue with electrophiles and with eneophiles have been studied. With boranes, tricarbonyl(3–6-η-hexa-3,5-dien-1-ol)iron(0) is obtained in moderate yields, after oxidative work-up of the intermediate borane complex, and with osmium tetraoxide in pyridine tricarbonyl(3–6-η-hexa-3,5-diene-1,2-diol)iron(0) is obtained in poor