36400-79-0Relevant academic research and scientific papers
Quantitative evaluation of the chloride template effect in the formation of dicationic [14]imidazoliophanes
Ramos, Susana,Alcalde, Ermitas,Doddi, Giancarlo,Mencarelli, Paolo,Perez-Garcia, Lluisa
, p. 8463 - 8468 (2002)
The formation of macrocycles containing two imidazolium rings such as 1·2X and 2·2X is anion-directed through hydrogen bonding. The template effect exerted by the chloride anion in the ring-closure reaction of the monocationic model intermediate 9+ to yield the [14]imidazoliophane 22+ has been evaluated. This effect was quantified following the kinetics of the macrocyclization by using a UV-vis technique. The rate of the ring closure of monocation 9+ is increased up to 10 times, in the presence of Bu4NCl 0.04 M. This finding confirms that the template effect is operative in the macrocyclization leading to dicationic [14]imidazoliophanes.
Kinetics and mechanism of reactions between 2,4,6-trinitrofluorobenzene and alcohols
Forlani, Luciano,Boga, Carla,Forconi, Marcello
, p. 1455 - 1458 (2007/10/03)
The kinetics of formation of some ethers from alcohols and 2,4,6-trinitrofluorobenzene were studied under first order conditions ([ROH]o > [TNFB]o). In CCl4, k (in dm3 s-1 mol-1) values are increased on increasing the values of the initial concentrations of the alcohols. This anomalous kinetic behaviour parallels that of reactions between amines and activated aromatic fluoro derivatives. The presence of a substrate-alcohol interaction which precedes the substitution process explains the kinetic behaviour of the alcohols.
