Superbase catalysis of oxazolidin-2-one ring formation from carbon dioxide and prop-2-yn-1-amines under homogeneous or heterogenous conditions
作者:Mirco Costa、Gian Paolo Chiusoli、Davide Taffurelli、Giulio Dalmonego
DOI:10.1039/a800453f
日期:——
N-alkyl-substituted prop-2-yn-1-amines and N-tri-, tetra- and penta-alkyl-substituted guanidines or other strong organic bases assemble under the action of carbon dioxide to afford carbamates, from which methyleneoxazolidinones 2 are formed by ring closure. If alkyl or cycloalkyl chains of appropriate length are present in the guanidines the reaction readily occurs under heterogenous conditions without
Orthoamide und Iminiumsalze, CIII. Synthese von <i>N</i>,<i>N</i>′,<i>N</i>′′<i>-</i>peralkylierten Guanidiniumsalz-basierten ionischen Flüssigkeiten durch Anionenmetathese
N , N ′, N ′′ - peralkylated guanidinium chlorides and N , N ′, N ′′ - peralkylated guanidines were prepared from N , N ′-peralkylated chloroformamidinium chlorides. The alkylation of the guanidines affords N , N ′, N ′′ - persubstituted guanidinium chlorides bromides, iodides, alkylsulfates, and tetrafluoroborates. Guanidinium tricyanomethanides and tetracyanopropenides were prepared from the chlorides
Reversible Solubilization of Typical Polycyclic Aromatic Hydrocarbons (PAH) by a Gas Switchable Surfactant
作者:Senlin Tian、Jian Long、Shanshan He
DOI:10.1007/s11743-014-1611-4
日期:2015.1
(DTMG) surfactant and its influence on reversiblesolubilization of typicalPAH. Experimental results showed that the reversibility of the DTMG surfactant is excellent. The critical micellar concentration (CMC), surface tension and pH of DTMG in CO2/N2 conditions undergo reversible changes promptly. DTMG·CO2 shows a strong solubilization capacity for PAH; the apparent solubilities of the selected PAH pyrene
表面活性剂强化修复(SER)是对多环芳烃(PAH)污染土壤的最有效修复方法之一。然而,由于缺乏表面活性剂的分离,再循环技术及其操作成本,SER的大规模部署受到限制。这项研究主要研究了2 - n-月桂基-1,1,3,3-四甲基胍(DTMG)表面活性剂的可逆性及其对典型PAH可逆增溶的影响。实验结果表明,DTMG表面活性剂的可逆性极好。临界胶束浓度(CMC),表面张力和CO 2 / N 2条件下DTMG的pH迅速发生可逆变化。DTMG·CO 2对PAH具有很强的增溶能力 所选PAH pyr,菲和蒽在4 mmol / L DTMG·CO 2溶液中的表观溶解度分别是在水中的32.4、17.1和14.6倍。相应摩尔的增溶比分别为5.4×10 -3,2.80×10 -2和1.1×10 -3,远高于那些用DTMG。通过在每种表面活性剂浓度下进行气体控制,可以释放出表面活性剂溶液中超过50%的PAH,并且
OSANAI, SHUICHI;ITOH, TAKESHI;YOSHIKAWA, SADAO, YUKAGAKU, 37,(1988) N, S. 508-513
作者:OSANAI, SHUICHI、ITOH, TAKESHI、YOSHIKAWA, SADAO
DOI:——
日期:——
KANTLEHNER, W.;HAUA, E.;MERGEN, W. W.;SPEH, P.;MAIER, T.;KAPASSAKALIDIS, +, LIEBIGS ANN. CHEM., 1984, N 1, 108-126
作者:KANTLEHNER, W.、HAUA, E.、MERGEN, W. W.、SPEH, P.、MAIER, T.、KAPASSAKALIDIS, +