کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1325675 1499897 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Generation of low-valent alkoxy niobium from Nb(OEt)5 and Grignard reagents and their use as catalysts in the cyclotrimerization of isocyanates
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Generation of low-valent alkoxy niobium from Nb(OEt)5 and Grignard reagents and their use as catalysts in the cyclotrimerization of isocyanates
چکیده انگلیسی


• A new highly active low-valent alkoxyniobium species has been developed.
• An efficient catalyst for cyclotrimerization of isocyanates.
• An efficient alternative to NbCl3(DME) in the field of organic synthesis.

A new highly active low-valent alkoxyniobium species has been developed following the reaction of Nb(OEt)5 with Grignard reagent such as i-PrMgCl or EtMgCl, with the material behaving as an efficient catalyst for cyclotrimerization reaction of isocyanates. In this reagent system, the existence of a low-valent niobium species was confirmed by the formation of the niobium–alkyne complex prepared from the Nb(OEt)5/Grignard reagent system and an alkyne. Furthermore, the hydrolysis and diallylation reactions of the niobium–alkyne complex provided further confirmation of its existence, with corresponding (Z)-alkene and diallylated products being isolated in good yields.

A new highly active low-valent alkoxyniobium species has been developed following the reaction of Nb(OEt)5 with Grignard reagent such as i-PrMgCl or EtMgCl, with the material behaving as an efficient catalyst for cyclotrimerization reaction of isocyanates.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Organometallic Chemistry - Volumes 741–742, 1 October 2013, Pages 109–113
نویسندگان
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