中文摘要：

钛杂环化合物分子内含有两个碳金属键,是一类重要的有机合成中间体.综述了近年来二茂钛杂三元、四元、五元、六元环化合物的结构特征、合成以及其在有机合成中的应用研究进展,就钛杂环中C—Ti键切断的选择性及反应活性开展了讨论与展望.

英文摘要：

Titanacycles, containing two carbon metal bonds in the molecule, have emerged as a series of significant intermediates in organic synthesis. The structural characteristics, preparation and synthetic applications of bis（cyclopentadienyl）titanathree, four, five, or six-membered rings have been summarized in the present review, in which the selective cleavage and reactivity of C--Ti bond in the titanacyle have been discussed.