从GeO中直接形成Ge-C债券(2)
Larry N Lewis1, Kyle E Litz, Joseph M Anostario
1GE Global Research Center, Niskayuna, NY 12309, USA. lewisln@crd.ge.com
Journal of the American Chemical Society
|September 26, 2002
概括
在基本条件下,二氧化与二甲基碳酸盐 (DMC) 反应比二氧化更快,产生有机化合物. 这项研究探讨了-碳键的直接形成,为金属氧化物的反应性提供了洞察力.
科学领域:
- 无机化学 无机化学 有机化学
- 有机金属化学 有机金属化学
- 材料科学 材料科学 材料科学
背景情况:
- 金属氧化物与有机碳酸盐的反应是合成有机金属化合物的关键领域.
- 之前的研究表明,二氧化在基本催化下与二甲基碳酸盐 (DMC) 反应.
- 了解二氧化 (GeO2) 在类似反应中的反应性对于扩展合成方法至关重要.
研究的目的:
- 为了研究二氧化 (GeO2) 与二甲基碳酸盐 (DMC) 在氧化 (KOH) 存在时的反应.
- 为了比较GeO2与二氧化 (SiO2) 的反应活性,用DMC进行基催化反应.
- 探索直接-碳键形成的机制,并研究其他金属氧化物的反应性.
主要方法:
- 反应是在5%的KOH在250°C和350°C的温度下进行的.
- 使用气体染色学-质谱学 (GC-MS),质子 (1H) 和碳-13 (13C) 核磁共振 (NMR) 谱学分析了产品.
- 进行了与SiO2和其他金属氧化物 (B2O3,Ga2O3,TiO2,Sb2O3,SnO2,SnO) 的比较实验.
主要成果:
- 二氧化在250°C时与DMC和KOH发生反应,产生四甲西曼 ((MeO) 4Ge).
- 对GeO2的反应速率明显高于SiO2,即使对GeO2.2的表面积较小.
- 在350°C时,GeO2产生了 (MeO) 4Ge (70%) 和甲基trimethoxysilane (MeGe(OMe) 3) (30%) 的混合物.
- 与其他金属氧化物的反应产生了各种产品,包括来自氧化的Sb(OMe) 3和来自SnO的有机素化合物.
结论:
- GeO2与DMC的基质催化反应比SiO2的反应快得多,这表明的反应性更高.
- 该研究证实了通过直接反应途径形成-碳键,不包括CO,H2或碳参与.
- 该方法可以扩展到其他金属氧化物,揭示了各种有机金属产品的形成.
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