67059-81-8Relevant academic research and scientific papers
Evidence of a stepwise acyl-transfer reaction mechanism: Nonlinear hammett plots for reactions of p-nitrophenyl substituted benzoates with hydroxide and p-chlorophenoxide
Um, Ik-Hwan,Chung, Eun-Kyung,Kwon, Dong-Sook
, p. 4787 - 4790 (1997)
The Hammett plots obtained for the title-reactions exhibit a break, i.e. ρ acyl values decrease from 2.21 ~ 2.44 to 1.45 ~ 1.52 as the acyl substituent becomes a strong electron withdrawing group (σ > 0.6). Such a break in the Hammett plots is suggestive of a change in the reaction mechanism and strong evidence of a stepwise mechanism for the acyl-transfer reaction.
The effect of acyl substituents on the α-effect: Contrasting α-effect profiles for reactions of 4-nitrophenyl substituted benzoates with neutral and anionic nucleophiles
Um, Ik-Hwan,Han, Hyun-Joo,Chung, Eun-Kyung
, p. 8051 - 8053 (2007/10/03)
The magnitude of the α-effect for reactions of 4-nitrophenyl substituted benzoates with a pair of anionic nucleophiles is independent of the electronic nature of the acyl substituent, while the one for the corresponding reactions with a pair of neutral nucleophiles increases as the acyl substituent changes from a strong electron withdrawing substituent to electron donating ones.
1,3-Benzodioxin derivatives
-
, (2008/06/13)
Novel racemic mixtures or optically active isomers of 1,3-benzodioxins of the formula STR1 wherein R1 ' is selected from the group consisting of hydrogen, alkali metal, alkaline earth metal, --NH4, aluminum, non-toxic, pharmaceutical
