Flash vacuum pyrolysis of stabilised phosphorus ylides. Part 16. Model studies for the construction of conjugated polymers
作者:R.Alan Aitken、Martin J Drysdale、Lawrence Hill、Keith W Lumbard、James R MacCallum、Shirley Seth
DOI:10.1016/s0040-4020(99)00611-0
日期:1999.9
Reaction of a range of bis(ylides) with acid chlorides has been used to prepare the bis(oxoylides) 11–15. Similarly a range of simple ylides react with bis(acid chlorides) to give bis(oxoylides) 19–27 with the isomeric structure. Flashvacuumpyrolysis (FVP) of one example of the first type results in extrusion of Ph3P rather than the expected Ph3PO while six examples of the second type do extrude
一系列双(酰化物)与酰氯的反应已用于制备双(氧酰化物)11-15。同样,一系列简单的叶立德与双(酰氯)反应,生成具有异构体结构的双(氧酰)19-27。第一种类型的快速真空热解(FVP)导致Ph 3 P挤出,而不是预期的Ph 3 PO挤出,而第二种类型的六个实例确实在500°C的FVP压力下挤出Ph 3 PO以获得双(炔烃)28。还已经制备了相应的双(三丁基phosph)的实例,但是使用逐步方法构建四(氧代酰)31的尝试是失败的。完全分配给出了其中的六个双(氧酰化物)的13 C NMR光谱。
Dendritic Effect on the Photoisomerization of 4,4′-Distyrylbiphenyl in Aqueous Solution
作者:Hiroya Sakurai、Tatsuo Arai
DOI:10.1246/bcsj.20160113
日期:2016.8.15
Newly synthesized 4,4′-distyrylbiphenyl-cored water-soluble dendrimers underwent trans-to-cis photoisomerization, while the core 4,4′-distyrylbiphenyl underwent cis-to-trans one-way photoisomerization.
Aspects of the production of FAB and SIMS mass spectra
作者:Dudley H. Williams、A. Frederick Findeis、Stephen Naylor、Bradford W. Gibson
DOI:10.1021/ja00241a013
日期:1987.4
La reduction est un processus commun dans les spectresdemasse FAB et ces processus sont souvent des reductions a un electron. A partir d'une analyse du rapport des ions simplement et doublement charges dans les spectres FAB, on montre que dans les spectres d'ions positifs de composes fortement basiques (peptides contenant de l'arginine), dans quantites comparables de substance analysee sont desorbees
La reduction est un processus common dans les specters de masse FAB et ces processus souvent des reductions an un电子。A partir d'une analysis du rapport des ions simplement et doublement charge dans les specters FAB, on montre que dans les specters d'ions positifs de composes fortement basiques (peptides contenant de l'arginine), dans quantites compares de Substance analysise sont desorbees ent qu'ions
A Convenient Synthesis of 2′,3′′′′-Dimethyl-<i>p</i>-sexiphenyl
作者:G. Subramaniam、R. K. Gilpin
DOI:10.1055/s-1992-35683
日期:——
Hitherto unreported 2′,3′′′′-dimethyl-p-sexiphenyl (6) is synthesized by an unambiguous route in good yield, starting from inexpensive commercially available biphenyl. The general reaction sequence consists of: (i) bischloromethylation of biphenyl, to give 4,4′-bis(chloromethyl)biphenyl (1) (ii) conversion of 1, to its bisphosphonium salt 2 (iii) a Wittig reaction of the salt with two equivalents of β-methylcinnamaldehyde to yield hitherto unreported 4,4′-bis(3-methyl-4-phenyl-buta-1,3-dienyl)biphenyl (3) (iv) the [4 + 2] cycloaddition of 3 with diethyl acetylenedicarboxylate to yield 4 (v) hydrolysis of 4 to 5 (vi) and oxidative decarboxylation of 5 with potassium hexacyano ferrate(III). All reactions which are simple and straightforward proceed in good yield, except the last step.