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Dalam senyawa ''anti''-dwilogam ini, logam ditemukan dijembatani oleh sebuah cincin karboksilat tunggal. Contohnya {(THF)<sub>3</sub>Ca}<sub>2</sub>(1,3,5-trifenilbenzena)<ref>{{cite journal | title = Stable "Inverse" Sandwich Complex with Unprecedented Organocalcium(I): Crystal Structures of [(thf)2Mg(Br)-C6H2-2,4,6-Ph3] and [(thf)3Ca{μ-C6H3-1,3,5-Ph3}Ca(thf)3] | author = Sven Krieck, Helmar Gorls, Lian Yu, Markus Reiher and Matthias Westerhausen | journal = [[J. Am. Chem. Soc.]] | year = 2009 | volume = 131 | pages = 2977–2985 | format = Article | doi = 10.1021/ja808524y}}</ref> dan {(Ar)
Sn}<sub>2</sub>[[Siklooktatetraena|COT]].
 
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===Senyawa sandwich ganda dan multilogam===
===Double and multimetallic sandwich compounds===
AnotherKeluarga family ofsenyawa sandwich compoundlainnya, involvesmelibatkan morelebih thandari onesatu metallogam sandwichedyang betweentersandwich twodi carbocyclicantara ringsdua cincin karbosiklik. ExamplesContoh ofsandwich theganda double sandwichantara includelain V<sub>2</sub>(indenylindenil)<sub>2</sub>,<ref>{{cite journal | title = Synthesis of Diindenyldivanadium—a New Variant of the Reductive Degradation of Metallocenes and Related Compounds | author = Klaus Jonas, Wolfgang Rüsseler, Carl Krüger and Eleonore Raabe | journal = [[Angew. Chem. Int. Ed. Engl.]] | year = 1986 | volume = 25 | pages = 928–929 | format = Communication | doi = 10.1002/anie.198609281}}</ref> Ni<sub>2</sub>([[CyclooctatetraeneSiklooktatetraena|COT]])<sub>2</sub><ref>{{cite journal | author = D. J. Brauer and C. Kruger | journal = J. Organomet. Chem. | year = 1976 | volume = 122 | pages = 265–273}}</ref> anddan Cr<sub>2</sub>(pentalenepentalena)<sub>2</sub>. Gambar Depicteddi belowbawah isadalah ancontoh example of a multimetallicsenyawa sandwich compoundmultilogam, whichyang hasmemiliki fourempat atom [[palladiumpaladium]] atomsyang joinedterhubung indalam asuatu chainrantai sandwichedsandwich betweendi twoantara dua unit [[peryleneperilena]] units.<ref>{{cite journal | title = Perylene-Tetrapalladium Sandwich Complexes | author = Tetsuro Murahashi, Tomohito Uemura, and Hideo Kurosawa | journal = [[J. Am. Chem. Soc.]] | year = 2003 | volume = 125 | issue = 28 | pages = 8436–8437 | format = Communication | doi = 10.1021/ja0358246 | pmid = 12848540}}</ref> The [[counterionIon kontra]]s are({{lang-en|counterion}} bulkyadalah [[noncoordinatingAnion anionnonkoordinasi|tetraarylboratetetraarilborat]]s tebal.
 
<center>
{|align="center" class="wikitable"
|<center>[[Image:Perylene-tetrapalladium-sandwich-complex-from-xtal-3D-vdW.png|200px]]</center>||<center>[[Image:Perylene-tetrapalladium-sandwich-complex-from-xtal-3D-balls-B.png|200px]]</center>||<center>[[Image:PeryleneTetrapalladiumSandwichComplex.png|center|400px|PeryleneKompleks Tetrapalladiumsandwich SandwichComplexperilena tetrapaladium]]</center>
|}
</center>
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==Applications==
Ferrocene and [[methylcyclopentadienyl manganese tricarbonyl]] have been used as [[antiknock agent]]s. Certain bent metallocenes of zirconium and hafnium are effective precatalysts for the polymerization of [[propylene]]. Many half sandwich complexes of ruthenium, such as those derived from [[(cymene)ruthenium dichloride dimer]] catalyse [[transfer hydrogenation]], a useful reaction in [[organic synthesis]].<ref>{{OrgSynth | author = Takao Ikariya, Shohei Hashiguchi, Kunihiko Murata, and [[Ryōji Noyori]]| title = Preparation of Optically Active (R,R)-Hydrobenzoin from Benzoin or Benzil| vol = 82 | pages = 10 | year = 2005 | prep = v82p0010}}</ref>
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