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1966年Sonogashira等研究了CP_2Ti(CO)_2与二苯乙炔的反应,并证实反应产物是钛杂五元化合物。1967年Kpf等合成出了第一个有机钛的炔烃衍生物——双(环戊二烯)二(苯乙炔基)钛,它是合成钛杂环化合物的重要中间体。1976年Atwood等用X-射线衍射方法测定了双(环戊二烯)四苯基代环戊二烯杂钛的晶体结构。他们发现,钛杂环是在同一个平面内,并且CP—Ti的键长缩短了0.23。据认为,这是由于钛的d轨道能量太高,不能
In 1966, Sonogashira et al. Studied the reaction of CP_2Ti (CO) _2 with toxene and confirmed that the reaction product was a titanium-based five-membered compound. In 1967, Kpf et al. Synthesized the first titanium alkyne derivative of titanium (bis (cyclopentadienyl) bis (phenylethynyl)), which is an important intermediate of synthetic titanium heterocyclic compounds. 1976 Atwood and other X-ray diffraction method was measured bis (cyclopentadienyl) tetraphenylcyclopentadienyltitanium crystal structure. They found that the titanium heterocycles were in the same plane and the bond length of CP-Ti was shortened by 0.23. It is believed that this is due to the titanium d orbital energy is too high, can not