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• 63873-32-5 1,8-bis(trimethylsilyl)octa-1,7-diyne 
• 119693-82-2 8,8-bis(cyclopentadienyl)-7,9-bis(trimethylsilyl)-8-zirconabicyclo{4.3.0}nona-1⁽⁹⁾,6⁽⁹⁾-diene 

Relevant academic research and scientific papers

Convenient preparative method of α,β-disubstituted cyclopentenone by zirconium promoted intermolecular coupling of an alkyne, EtMgBr (or ethylene) and CO

Treatment of Cp2ZrCl2 with 2 equiv of EtMgBr in THF, followed by addition of an internal alkyne and subsequent treatment with CO/I2 gave α,β-disubstituted cyclopentenone in good to high yields. When a conjugated enyne was used as an

Titanium-mediated [2 + 2 + 2] coupling of diynes with homoallylic alcohols

(Matrix presented) In connection with the known diyne-ene [2 + 2 + 2] cycloaddition reactions mediated by titanium aryloxides, the ability of titanium alkoxides to promote coupling of a titanacyclopentadiene with an alkene has been assessed for the isomer

Reaction of Zirconocene Ethylene Complex with Diynes. Formation of Bridged Zirconacyclopentenes

Reactions of diynes RCC-X-CCR with zirconocene ethylene complex Cp2Zr(CH2=CH2) were investigated.When X was C6H4 or C4H2S bridged zirconacyclopentenes were selectively formed.They were easily converted into bridged cyclopentenone derivatives.In the case o

Some metallabicyclo-octadienes and -nonadienes of dicyclopentadienyltitanium, -zirconium and -hafnium

Titanocene, zirconocene, and hafnocene dichlorides were reduced in the presence of terminally disubstituted 1,6-heptadiyne or 1,7-octadiyne to produce dicyclopentadienylmetallabicyclooctadienes and -nonadienes.The compounds were characterized by elemental

Novel Bicyclization of Enynes and Diynes Promoted by Zirconocene Derivatives and Conversion of Zirconabicycles into Bicyclic Enones via Carbonylation

Enynes and diynes react with "ZrCp2" (where Cp = η5-C5H5) generated by treating Cl2ZrCp2 with Mg and HgCl2 or 2 equiv of an alkyllithium, such as n-BuLi, or a Grignard reagent, such as EtMgBr, and can produce in excellent yields zirconabicycles represented by 2 (M = Zr) and 8, respectively.Their protonolysis can provide the corresponding exocyclic alkenes and conjugated dienes 9, respectively.Iodinolysis of 2 (M = Zr) can give the corresponding diiodides in high yields, while carbonylation of 2 (M = Zr) can produce bicyclic enones 3 (Y = O) in moderate to goodyields.Although the bicyclization reaction fails with terminal alkyne containing substrates, various types of substituents on the alkyne moiety, such as alkyl, alkenyl, aryl, trialkylsilyl, and trialkylstannyl groups, can be accommodated.Investigation of the n-BuLi-Cl2ZrCp2 reaction has revealed that is gives first (n-Bu)2ZrCp2 at -78 deg C, which then decomposes to give Cp2Zr(CH2=CHEt), identified as its PMe3 complex 11.The PMe3-stabilized complex reacts with diphenylacetylene to produce a crystalline compound which has been identified as a zirconacyclopropene, 36a.This demonstrated, for the first time, the feasibility of converting alkynes into zirconacyclopropenes.The reaction of preformed, three-membered zirconacycles with alkynes gives five-membered zirconacycles.The reaction of diphenylacetylene is ca. 150 times as fast as that of (E)-stilbene.These results support a mechanism involving formation of a zirconacyclopropene intermediate followed by its intramolecular carbometalation with the alkene moiety of enynes for the Zr-promoted bicyclization of enynes.

Cyclization of Diacetylenes to E,E Exocyclic Dienes. Complementary Procedures Based on Titanium and Zirconium Reagents

The intramolecular cyclization of diacetylenes has been achieved by using either of the reagent combinations Cp2TiCl2/PMePh2/Na(Hg) or Cp2ZrCl2/Mg/HgCl2 in solvent tetrahydrofuran.The procedures are compatible with a variety of saturated functionality (O,

REACTION OF ZIRCONOCENE DICHLORIDE WITH ALKYLLITHIUMS OR ALKYL GRIGNARD REAGENTS AS A CONVENIENT METHOD FOR GENERATING A "ZIRCONOCENE" EQUIVALANT AND ITS USE IN ZIRCONIUM-PROMOTED CYCLIZATION OF ALKENES, ALKYNES, DIENES, ENYNES, AND DIYNES

Treatment of Cl2ZrCp2 with 2 equiv of alkylmetals (RM) containing Li or Mg, e.g., n-BuLi, in THF produces organozirconium species that act as sources of "ZrCp2," the latter product being a convenient reagent for preparing zirconacycles.