3935-02-2Relevant academic research and scientific papers
Aminoketone Enolisation: Influence of Increasing Chain Length on Intramolecular Catalysis
Cox, Brian G.,Maria, Paolo De,Guerzoni, Lorenza
, p. 163 - 168 (2007/10/02)
Kinetic results are reported on the rates of ionisation of piperidino- and morpholino-phenones of varying chain length in buffer and dilute hydroxide solution, as measured by their rates of halogenation.For both series of aminoketones two important factors are responsible for a high reactivity relative to acetophenone: the positive charge on the protonated (and N-methylated) derivatives, which has a strong influence in the α-(n=1) and β-(n=2) position, and intramolecular general base catalysis by the neutral amino group, which has a maximum effect for the δ-(n=4) derivative.Results for the more acidic protonated morpholinoketones are almost identical to those of corresponding piperidinoketones and show no evidence of intramolecular general acid catalysis.The reduced basicity of the morpholino group is reflected in lower rate constants for the intramolecular general base-catalysed reaction.
N-substituted alpha-aminoalkylacrylophenones and some related compounds: a new class of spermicidal agents.
Gupta,Nautiyal,Jhingran,Kamboj,Setty,Anand
, p. 303 - 307 (2007/10/02)
The results of a screening program to test the spermicidal effectiveness of several compounds is presented. The program was initiated after N-substituted 3-aminoacrylophenones were found to have unexpected spermicidal activity. The compounds had been synthesized as possible antiinflammatory agents. This result prompted the synthesis and screening of N-substituted alpha-aminomethylacrylophenones, alpha-(2-aminomethyl)acrylophenones and 3-N-substituted-2-methyleneindan-1-ones. The starting materials, substituted acetophenones, for the synthesis of N-substituted alpha-aminomethylacrylophenones were either commercial products or obtained by standard methods. N-substituted amino-butyrophenone was reacted with paraformaldehyde to yield the alpha-(2 aminoethyl)acrylophenones. A series of reactions was undertaken to synthesize 2-methyleneindan-1-ones. The preparation of each is detailed and molecular formulas are provided. Spermicidal activity was assessed by dissolving the compound in physiological saline at different concentrations. 2 drops of rat sperm suspension or human semen were placed on a slide, followed by 2 drops of a compound solution. Control slides of physiological saline were prepared. The contents were mixed for approximately 5 seconds and examined under a phase contrast microscope. The results were considered positive if 100% of the spermatozoa became immotile instantaneously. Several of the compounds showed marked spermicidal activity.
