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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 1
BKCSDE 32(1)
January 20, 2011

Title	Heterogeneous SnCl₂/SiO₂ versus Homogeneous SnCl₂ acid catalysis in the benzo[N,N]-heterocyclic condensation
Author	Hossein Reza Darabi*, Kioumars Aghapoor, Farshid Mohsenzadeh, Mohammad Reza Jalali, Shiva Talebian, Leila Ebadi Nia, Ehsan Khatamifar, Ali Aghaee
Keywords	SnCl₂/SiO₂, Heterogeneous Lewis acid catalyst, Sustainability, Benzo[N,N]-heterocyclic condensation
Abstract	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 SnCl₂·2H₂O was finally selected. Among various solid supports activated with SnCl₂, heterogeneous SnCl₂/SiO₂ proved to be the most effective and significantly higher conversions were achieved compared to SnCl₂·2H₂O itself. The results of TG-DTA and BET indicated that dispersed SnCl₂ 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.
Page	213 - 218
Full Text	PDF

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