97208-36-1Relevant academic research and scientific papers
Mechanism of Alkaline Hydrolysis of Some HO-π-COOAr Acyl Derivatives
Cevasco, Giorgio,Thea, Sergio
, p. 5422 - 5426 (1999)
To gain knowledge on the role played by the nature of the bridge interposed between hydroxyl and carbonyl groups in esters of the title type, in principle able to hydrolyze through dissociative pathways via the conjugate base of the substrate (E1cB mechanism), we have studied the alkaline hydrolyses of 2,4-dinitrophenyl esters in which the π-system is a biphenyl, azobenzene, benzylide-neaniline, or stilbene skeleton. Kinetic data, such as reactivity comparisons and Arrhenius parameters, show that these substrates react through the usual, associative, BAc2 mechanism. This outcome is discussed and interpreted from both structural and energetic standpoints. The data suggest that a value of 0.0 is the most appropriate assignment of the σp value for the benzylidenamino substituent (C6H5CH=N-).
1,3-propandiol bis 4-(4-alkyloxy-benzylideneamino)benzoates a new series of mesogenic dimers
Weissflog, Wolfgang,Lischka, Christiane,Pelz, Karsten,Wirth, Ina,Diele, Siegmar,Pelzl, Gerhard
, p. 279 - 288 (2001)
A new homologous series of mesogenic dimers with an odd-numbered flexible spacer is presented. It is shown that the short-chained members of the series form a SmC phase, only, whereas the longer-chained homologues exhibit a SmA phase. The layer spacing of the SmC phase was found to be about the half of the molecular length. This result and the occurrence of singularities with s = 1/2 or s = 3/2 in the schlieren texture point to an intercalated structure. The electro-optical switching of the SmC phase can be attributed to a dielectric transition.
Die Hydrolyse Schiffscher Basen - Substituenten- und Loesungsmitteleinfluss. I. Die basische Hydrolyse von 4'-Carboxy-N-(X-benzyliden)anilinen als Zweistufenreaktion in methanolisch-waessriger Loesung - Kinetik und Aktivierungsparameter
Mitzner, R.,Seidel, S.
, p. 1179 - 1185 (2007/10/02)
It is shown that the hydrolysis of some Schiff bases which were resolved in methanol previously give a two step reaction in basic medium. 35 rate constants are correlated with the Hammett's ? constants of the substituent groups, showing that linear relationship exist with ρ= -1,54 and ρ= -0,63, respectively.Activation parameters are given of both first and second step of reaction.
