Quantitative Evaluation of the Catalytic Activity of Dendrimers with Only One Active Center at the Core: Application to the Nitroaldol (Henry) Reaction
摘要:
One reference tertiary amine and three families of structurally related trialkylamines and dendrimers have been synthesized, characterized, and studied by molecular dynamics simulations. The catalytic activity of these amines in the nitroaldol (Henry) reaction between 2-nitroethanol and benzaldehyde has been measured by FT-IR spectroscopy. It is found that, in this kind of molecule with only one catalytic center at the core, the efficiency of the catalytic process decreases with the size and/or the degree of ramification of the dendrimer. According to these results, there is a linear departure from the behavior predicted by the hard sphere collision theory (HSCT) as the size of the dendrimer increases. Therefore, the behavior of structurally related dendrimers can be quantified in terms of their molecular weight and reagent accessible surfaces.
Dendritic Catalysts for the Nitroaldol (Henry) Reaction
作者:Iñaki Morao、Fernando P Cossío
DOI:10.1016/s0040-4039(97)01477-9
日期:1997.9
Dendritic molecules with a single triethylene amine core surrounded by hyperbranched polyether sectors catalyze the nitroaldol reaction between aromatic aldehydes and nitroalkanes. (C) 1997 Elsevier Science Ltd.
Quantitative Evaluation of the Catalytic Activity of Dendrimers with Only One Active Center at the Core: Application to the Nitroaldol (Henry) Reaction
作者:Aizpea Zubia、Fernando P. Cossío、Iñaki Morao、Marina Rieumont、Xabier Lopez
DOI:10.1021/ja039888s
日期:2004.4.28
One reference tertiary amine and three families of structurally related trialkylamines and dendrimers have been synthesized, characterized, and studied by molecular dynamics simulations. The catalytic activity of these amines in the nitroaldol (Henry) reaction between 2-nitroethanol and benzaldehyde has been measured by FT-IR spectroscopy. It is found that, in this kind of molecule with only one catalytic center at the core, the efficiency of the catalytic process decreases with the size and/or the degree of ramification of the dendrimer. According to these results, there is a linear departure from the behavior predicted by the hard sphere collision theory (HSCT) as the size of the dendrimer increases. Therefore, the behavior of structurally related dendrimers can be quantified in terms of their molecular weight and reagent accessible surfaces.
Transalkylation via C–N Bond Cleavage of Amines Catalyzed by Super Organophotoreductant CBZ6
作者:Yong-Ze Chen、Yi-Ming Chen、Yuan Hu、Jian-Ping Qu、Yan-Biao Kang
DOI:10.1021/acs.orglett.3c02827
日期:2023.10.20
organoreductant CBZ6-catalyzed tandem transalkylation–cyclization using amines as traceless radical donors and stabilizer is reported. The later-stage breaking of an N–C bond enables the transalkylation with a secondaryamine as the leaving moiety. A wide range of tertiaryamines were used as alkyl radical donors for the C1–C8 alkyls. This traceless stabilizer also enabled the transalkylation with methyl