Cycloheptatrienyl-acetylide

Other li acetylides Li-C=C-R with R = hexyl [21] or benzylether dendrons [22, 23] (up to the fourth generation) have also been attached to (Figure 3.3), and various different electrophiles have been used to complete the reaction with the intermediate li-fuUeride (Scheme 3.2 and Figure 3.3). Besides the protonation, alkyl-, benzyl-, cycloheptatrienyl-, benzoyl- or vinylether-derivatives or formaldehyde and dichloro-acetylene were used as electrophiles [12,20]. Most of these electrophiles are attached to the anion in the expected C-2 position. The 1,4-adducts are available by quenching the anion with the tropylium cation or benzoyl chloride [12]. The fuUerene anion can be stabilized by introduction of benzylether dendrons. The lifetimes of the anions change with the size of the dendrons [22]. 

This review deals with metal-hydrocarbon complexes under the following headings (1) the nature of the metal-olefin and -acetylene bond (2) olefin complexes (3) acetylene complexes (4) rr-allylic complexes and (5) complexes in which the ligand is not the original olefin or acetylene, but a molecule produced from it during complex formation. ir-Cyclopentadienyl complexes, formed by reaction of cyclopentadiene or its derivatives with metal salts or carbonyls (78, 217), are not discussed in this review, neither are complexes derived from aromatic systems, e.g., benzene, the cyclo-pentadienyl anion, and the cycloheptatrienyl cation (74, 78, 217), and from acetylides (169, 170), which have been reviewed elsewhere. 

Bisalkynylplatinate complexes with the 6, A-chelating benzo[ ]-quinolinate ligand 683 have been prepared by transmetallation of the lithium acetylides with dichloroplatinate. " " The absorption peaks at 392-405 nm are attributed to ligand (acetylide) to ligand (benzoquinolinate) transition. Tris(cycloheptatrienyl)phosphine and diphenyl-phosphine oxide form complexes with two alkynyl ligands at m-positions 684 and 685. " " ... 

Ferrocenyl-containing Complexes. - A collection of compounds derived from ferrocenyl-substituted acetylide Ti-based tweezer molecules have been prepared and characterised." The crystal structure of the cyclohexadienyl-containing complex 168 has been reported." A series of multimetallic complexes have been prepared by addition of enolates of bis-(ferrocenyl)-1,3-diketones to a range of p -ethene-, riCcydohexatriene-, p -cycloheptatrienyl- and pCcyclo-heptatrienyl-containing complexes." The crystal structure of 169 has been described." Compounds 170 and 171 were obtained from the reaction between... 

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