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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 29, Number 7
BKCSDE 29(7)
July 20, 2008 

 
Title
Promoting Effect of AlCl3 on the Fe-catalyzed Dimerization
of Bicyclo[2.2.1]hepta-2,5-diene
Author
Mai Dao Nguyen, Ly Vinh Nguyen, Je Seung Lee, Jeong Sik Han, Byung Hun Jeong, Minserk Cheong, Hoon Sik Kim*, Ho-Jung Kang*
Keywords
Ionic liquids, 2,5-Norbornadiene, Dimerization, Hexacyclic endo-endo isomer
Abstract
The activity of the catalytic system composed of Fe(acetylacetonate)3 (Fe(acac)3), triphenylphosphine, and diethylaluminum chloride for the dimerization of bicyclo[2.2.1]hepta-2,5-diene (2,5-norbornadiene, NBD) to produce hexacyclic endo-endo dimer (hexacyclo[7.2.1.02,8.13,7.15,13.04,6]tetradec-10-ene, Hnn) was significantly enhanced by the presence of AlCl3, especially at the molar ratios of NBD/Fe(acac)3 of 500. XPS analysis of the catalytic systems clearly demonstrates that AlCl3 facilitates the reduction of Fe(acac)3 to form active species, Fe(II) and Fe(0) species. The layer separation was observed when [BMIm]Cl was used along with AlCl3, but catalyst recycle was not very successful.
Page
1364 - 1368
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