Generation of low-valent alkoxy niobium from Nb(OEt)5 and Grignard reagents and their use as catalysts in the cyclotrimerization of isocyanates

被引：18

作者：

Ozaki, Makoto ^{[1
]}

Obora, Yasushi ^{[1
]}

Tada, Yusuke ^{[1
]}

Ishii, Yasutaka ^{[1
]}

机构：

[1] Kansai Univ, Dept Chem & Mat Engn, Fac Chem Mat & Bioengn, Suita, Osaka 5648680, Japan

来源：

JOURNAL OF ORGANOMETALLIC CHEMISTRY | 2013年 / 741卷

关键词：

Low-valent niobium; Alkoxyniobium; Catalytic reaction; Cyclotrimerization; Isocyanate; CHEMICAL-VAPOR-DEPOSITION; TITANIUM ARYLOXIDE COMPOUNDS; TANTALUM-ALKYNE COMPLEXES; N-HETEROCYCLIC CARBENES; NIOBATE THIN-FILMS; 2+2+2 CYCLOADDITION; STEREOSELECTIVE-SYNTHESIS; SELECTIVE TRIMERIZATION; TRIALLYL ISOCYANURATE; ASYMMETRIC-SYNTHESIS;

D O I：

10.1016/j.jorganchem.2013.05.035

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

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. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：109 / 113

页数：5