极性转换方法是一种重要的有机合成新方法，对极性转换的概念和应用作了论述，并对一些极性转换的新技术作了简。
The concept and some applications about umpolung were expounded, and some new methods about the application of the umpolung were given.
本文研究了硫化氢与四氯化钛在某些有机介质中的反应，并提出了一个合成二硫化钛的新方法。
This paper has studied the reactions of hydrogen sulphide with titanium tetrachloride in some organic mediums, and advanced a new method of synthesizing titanium disulphide.
研究了以膨润土提铝残渣为原料，采用低温加热法直接合成有机硅化合物新方法。
A new method is presented for the synthesis of pentacoordinate silicon complexes directly from residues left behind extracting of aluminum from bentonite by the low-temperature heating method.
而自由基扩环反应是合成中环乃至大环有机化合物的一种有效的新方法，已成为当今有机合成化学的前沿研究领域之一。
Radical ring expansion is a new strategy to synthesize the medium-sized and even large rings, nowadays, it is one of the important research fields of organic chemistry.
而自由基扩环反应是合成中环乃至大环有机化合物的一种有效的新方法，已成为当今有机合成化学的前沿研究领域之一。
Radical ring expansion is a new strategy to synthesize the medium-sized and even large rings, nowadays, it is one of the important research fields of organic chemistry.
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