title: A highly selective synthesis of new alkenylsilsesquioxanes by hydrosilylation of alkynes.
abstract: Hydrosilylation of a wide group of mono- and disubstituted (symmetrical and nonsymmetrical) alkynes with 1-dimethylsiloxy-3,5,7,9,11,13,15-heptaisobutylpentacyclo-[9.5.1.13,9.15,15.17,13]octasiloxane ((HSiMe2O)(i-Bu)7Si8O12, 1) in the presence of Karstedt's catalyst (Pt2(dvs)3) has been performed for the first time. A series of new 1,2-(E)-disubstituted and 1,1,2-(E)-trisubstituted ethenes with a silsesquioxane moiety were selectively afforded and fully characterized. On the basis of nuclear magnetic resonance (NMR) and infrared spectroscopy (in situ FT-IR and/or FT-IR), the influence of alkyne structure and reaction conditions on the stereoselectivity as well as on the progress of triple bond hydrosilylation catalyzed by Pt2(dvs)3was explained. The results of the studies clearly indicated for which reagents the developed procedures lead to alkenylsilsesquioxanes with almost stoichiometric yields in short time, and for which other catalytic systems or methods should be considered.
authors.affiliation: Centre for Advanced Technologies, Adam Mickiewicz University in Poznan, Umultowska 89c, 61-614 Poznan, Poland. bogdan.marciniec@amu.edu.pl.
authors.forename: A
authors.initials: A
authors.lastname: Franczyk
authors.affiliation: Centre for Advanced Technologies, Adam Mickiewicz University in Poznan, Umultowska 89c, 61-614 Poznan, Poland. bogdan.marciniec@amu.edu.pl and Department of Organometallic Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, 61-614 Poznan, Poland.
authors.forename: K
authors.initials: K
authors.lastname: Stefanowska
authors.affiliation: Centre for Advanced Technologies, Adam Mickiewicz University in Poznan, Umultowska 89c, 61-614 Poznan, Poland. bogdan.marciniec@amu.edu.pl.
authors.forename: M
authors.initials: M
authors.lastname: Dutkiewicz
authors.affiliation: Centre for Advanced Technologies, Adam Mickiewicz University in Poznan, Umultowska 89c, 61-614 Poznan, Poland. bogdan.marciniec@amu.edu.pl and Department of Organometallic Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, 61-614 Poznan, Poland.
authors.forename: D
authors.initials: D
authors.lastname: Frąckowiak
authors.affiliation: Centre for Advanced Technologies, Adam Mickiewicz University in Poznan, Umultowska 89c, 61-614 Poznan, Poland. bogdan.marciniec@amu.edu.pl and Department of Organometallic Chemistry, Faculty of Chemistry, Adam Mickiewicz University in Poznan, Umultowska 89b, 61-614 Poznan, Poland.
authors.forename: B
authors.initials: B
authors.lastname: Marciniec