三氯一茂钛 、 dimethylpyrone 在
叔丁基锂 、 zinc(II) chloride 作用下,
以
not given 为溶剂,
以61%的产率得到
参考文献:
名称:
A Modular and Efficient Synthesis of Functional Titanocenes
摘要:
A modular synthesis of functional titanocenes featuring building blocks is described. The approach allows straightforward access to large numbers of structurally diverse titanocenes that are pertinent for catalysis, structural studies, and bioinorganic chemistry. Among the functional groups introduced are amino acids, sugars, and fluorescence labels that are attached to the cyclopentadienyl ligand as esters and amides.
approach to carbonyl-functionalized titanocenes is described. Through the introduction of highly electrophilic acid chlorides to the complexes, reactions with nucleophiles can be realized that are incompatible with classical methods of titanocene synthesis. The first amino acid functionalized titanocenes were synthesized. The amide- and ketone-functionalized titanocenes are cationic, due to the complexation
Novel Organometallic Gelators with Enhanced Amphiphilic Character: Structure−Property Correlations, Principles for Design, and Diversity of Gelation
作者:Andreas Gansäuer、Iris Winkler、Thorsten Klawonn、Roeland J. M. Nolte、Martin C. Feiters、Hans G. Börner、Jens Hentschel、Karl Heinz Dötz
DOI:10.1021/om801022c
日期:2009.3.9
A series of new titanocene complexes was synthesized and investigated toward their gelation abilities. The first structure-property correlations for organometallic gelators could be deduced. The gels and their structural diversity were characterized by TEM, cryo-SEM, and AFM as well as CD-spectroscopy. The organometallic gets display an enhanced amphiphilic character compared to typical organic ALS gelators.
Synthesis of Stable Functional Titanocene Enolates
A modular approach to bench-stable titanocene enolates is described. The reaction of titanocenes containing pendent acid chlorides activated methylene compounds in the presence of excess base results in the formation the pivotal etiolates. In all cases, the enolates are coordinated to the titanocene, which acts as a stabilizing template in an intramolecular manner, as demonstrated by NMR spectroscopy and X-ray crystallo-graphy. Upon protonation with Strong acids, the C-C bond formed (hiring the acylation is cleaved. Hence, the template effect can be reversed by adjusting the acidity of the reaction medium.