Unexpected carbon-oxygen bond cleavage of THF promoted by guanidinate titanium complex/lithium diisopropylamide： Synthesis and crystal structure

An unexpected carbon-oxygen bond cleavage of THF （THF = tetrahydrofuran） promoted by guanidinate titanium complex was described. Guanidinate lithium [Pr2 ^1NC（NCy）2]Li （Cy = cyclohexyl） formed in situ reacted with TiCl4（THF）2 in a 2：1 molar ratio to produce the guanidinate titanium chloride [Pr2 ^1N...

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Bibliographic Details
Published in:Chinese science bulletin 2005, Vol.50 (24), p.2817-2820
Main Authors: Zhang, Yong, Wang, Mei, Yao, Yingming, Shen, Qi
Format: Article
Language:English
Subjects:
C-O键裂
Carbon
Chemical analysis
Cleavage
Crystal structure
Lithium
NMR
Nuclear magnetic resonance
Oxygen
Tetrahydrofuran
Titanium
Titanium chlorides
二异丙基酰胺
四氢呋喃
晶体结构
胍配体
钛络合物
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Summary:An unexpected carbon-oxygen bond cleavage of THF （THF = tetrahydrofuran） promoted by guanidinate titanium complex was described. Guanidinate lithium [Pr2 ^1NC（NCy）2]Li （Cy = cyclohexyl） formed in situ reacted with TiCl4（THF）2 in a 2：1 molar ratio to produce the guanidinate titanium chloride [Pr2 ^1NC（NCy）2]2TiCl2 （1） in good yield. The reaction of [Pr2 ^1NC（NCy）2]2TiCl2 with lithium diisopropylamide in THF afforded an unexpected [Pr2 ^1NC（NCy）2]2Ti（OBu^n）2 （2）, which was formed by the cleavage of carbon-oxygen bond of THF. Complexes 1 and 2 were fully characterized by elemental analysis, NMR and IR spectroscopies, and X-ray crystal structure determination for complex 2.
ISSN:1001-6538
2095-9273
1861-9541
2095-9281
DOI:10.1360/982005-487