TY - JOUR
T1 - Forcing a cis-product by matrix imprinting
T2 - Heck reaction catalyzed by palladium acetate entrapped within cis-imprinted sol-gel derived silicates
AU - Tsvelikhovsky, Dmitry
AU - Pessing, Dikla
AU - Avnir, David
AU - Blum, Jochanan
PY - 2008/12
Y1 - 2008/12
N2 - While the Heck coupling of aryl bromides with styrenes by palladium acetate entrapped within octylated silica sol-gel forms almost entirely trans-stilbenes, the catalysis by the palladium compound within the cis-pre-imprinted support gives stilbenes that are substantially enriched by cis-oriented isomers. Although the ceramic support is completely freed from the imprint prior to the coupling process, cis-stilbenes are formed with similar selectivities upon recycling of the catalyst systems for at least four consecutive runs.
AB - While the Heck coupling of aryl bromides with styrenes by palladium acetate entrapped within octylated silica sol-gel forms almost entirely trans-stilbenes, the catalysis by the palladium compound within the cis-pre-imprinted support gives stilbenes that are substantially enriched by cis-oriented isomers. Although the ceramic support is completely freed from the imprint prior to the coupling process, cis-stilbenes are formed with similar selectivities upon recycling of the catalyst systems for at least four consecutive runs.
KW - C-C coupling reactions
KW - Heterogeneous catalysis
KW - Imprinting
KW - Sol-gel process
KW - Stereoselectivity
UR - http://www.scopus.com/inward/record.url?scp=57849159775&partnerID=8YFLogxK
U2 - 10.1002/adsc.200800590
DO - 10.1002/adsc.200800590
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AN - SCOPUS:57849159775
SN - 1615-4150
VL - 350
SP - 2856
EP - 2858
JO - Advanced Synthesis and Catalysis
JF - Advanced Synthesis and Catalysis
IS - 18
ER -