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Darabi, Hossein Reza,Aghapoor, Kioumars,Mohsenzadeh, Farshid,Jalali, Mohammad Reza,Talebian, Shiva,Ebadi-Nia, Leila,Khatamifar, Ehsan,Aghaee, Ali Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.1
The scope of homogeneous Lewis acid-catalyzed benzo[N,N]-heterocyclic condensation was expanded to include the use of various metal salts not reported in the literature and $SnCl_2{\cdot}2H_2O$ was finally selected. Among various solid supports activated with $SnCl_2$, heterogeneous $SnCl_2/SiO_2$ proved to be the most effective and significantly higher conversions were achieved compared to $SnCl_2{\cdot}2H_2O$ itself. The results of TG-DTA and BET indicated that dispersed $SnCl_2$ coordinates with surface hydroxyl groups of silica leading to formation of stable Lewis acid sites. Low catalyst loading, operational simplicity, practicability and applicability to various substrates render this eco-friendly approach as an interesting alternative to previously applied procedures.
Hossein Reza Darabi,Kioumars Aghapoor,Farshid Mohsenzadeh,Mohammad Reza Jalali,Shiva Talebian,Leila Ebadi-Nia,Ehsan Khatamifar,Ali Aghaee 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.1
The scope of homogeneous Lewis acid-catalyzed benzo[N,N]-heterocyclic condensation was expanded to include the use of various metal salts not reported in the literature and SnCl_2·2H_2O was finally selected. Among various solid supports activated with SnCl_2, heterogeneous SnCl_2/SiO_2 proved to be the most effective and significantly higher conversions were achieved compared to SnCl_2·2H_2O itself. The results of TG-DTA and BET indicated that dispersed SnCl_2 coordinates with surface hydroxyl groups of silica leading to formation of stable Lewis acid sites. Low catalyst loading, operational simplicity, practicability and applicability to various substrates render this eco-friendly approach as an interesting alternative to previously applied procedures.