4773-83-5Relevant academic research and scientific papers
Van der Waals complexes, intermediates in unimolecular reactions
Roth, Wolfgang R.,Hunold, Frank
, p. 1917 - 1928 (1996)
Thermolysis of rac- and meso-1,1′,2,2′,3,3′-hexamethyl-1,1′-biindenyl and (1E,5E)-1,3,4,6-tetraphenyl-1,5-hexadiene in supercritical CO2 in the presence of oxygen allows to identify three types of intermediates, the free radicals (2 and 5) and the equilibrating complexes I and II consisting of radical pairs. From the oxygen dependence of the trapping and rearrangement rates it is shown, that the complex I is the primary thermolysis product, which in contrast to the complex II does not react with oxygen. The temperature dependance of these rates allows to calculate the enthalpy well of the complex II, which agrees well with predictions of our reaction force field. VCH Verlagsgesellschaft mbH, 1996.
Synthesis of highly substituted indene derivatives by Br?nsted acid catalyzed Friedel-Crafts reaction of homoallylic alcohols
Zhang, Xiaoxiang,Teo, Wan Teng,Rao, Weidong,Ma, Dik-Lung,Leung, Chung-Hang,Chan, Philip Wai Hong
supporting information, p. 3881 - 3884 (2014/07/08)
An efficient synthetic method to prepare highly substituted indenes in moderate to excellent yields that relies on Br?nsted acid catalyzed Friedel-Crafts reaction of homoallylic alcohols under mild conditions is described.
New cyclopentadienyl, indenyl or fluorenyl substituted phosphine compounds and their use in catalytic reactions
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Page/Page column 28, (2008/06/13)
The invention is directed to a phosphine compound represented by general formula (1) wherein R' and R" independently are selected from alkyl, cycloalkyl and 2-furyl radicals, or R' and R" are joined together to form with the phosphorous atom a carbon-phosphorous monocycle comprising at least 3 carbon atoms or a carbon-phosphorous bicycle; the alkyl radicals, cycloalkyl radicals, and carbon-phosphorous monocycle being unsubstituted or substituted by at least one radical selected from the group of alkyl, cycloalkyl, aryl, alkoxy, and aryloxy radicals; Cps is a partially substituted or completely substituted cyclopentadien-1-yl group, including substitutions resulting in a fused ring system, and wherein a substitution at the 1-position of the cyclopentadien-1-yl group is mandatory when the cyclopentadien-1-yl group is not part of a fused ring system or is part of an indenyl group. Also claimed is the use of these phosphines as ligands in catalytic reactions and the preparation of these phosphines.
New indenyl titanium catalysts for syndiospecific styrene polymerizations
Ready, Thomas E.,Chien, James C.W.,Rausch, Marvin D.
, p. 11 - 27 (2007/10/03)
A series of multi-methyl-substituted indenes as well as allylindene, n-propylindene, n-but-1-enylindene, and n-butylindene have been prepared in good yields. The substituted indenes were converted into trimethylsilyl derivatives via reactions of intermediate organolithium complexes with chlorotrimethylsilane. The corresponding titanium complexes were synthesized in excellent yields from reactions of the trimethylsilyl derivatives with TiCl4. The titanium complexes were evaluated as styrene polymerization catalysts in toluene solution when activated by methylaluminoxane. In general, catalytic activities decreased with each additional methyl substituent. Syndiospecificities were very high (90-95%).
