Stereoselective Alkene Isomerization over One Position
作者:Casey R. Larsen、Douglas B. Grotjahn
DOI:10.1021/ja3036477
日期:2012.6.27
Although controlling both the position of the double bond and E:Z selectivity in alkene isomerization is difficult, 1 is a very efficient catalyst for selective mono-isomerization of a variety of multifunctional alkenes to afford >99.5% E-products. Many reactions are complete within 10 min at room temperature. Even sensitive enols and enamides susceptible to further reaction can be generated. Catalyst
Regioselective Platinum Catalyzed β-Hydrosilylation of Allylic Benzene Derivatives with Cyclic Siloxane D4 H
作者:Abdelghani El Malki、Abdellah Hannioui、El Mostapha Rakib、Nourredine Knouzi、Michel Vaultier
DOI:10.2174/157017811795684992
日期:2011.6.1
Conditions have been found for an efficient regioselective β-hydrosilylation of allylbenzene, 2-allyl-1- trimethylsiloxybenzene, 4-allyl-1,2-(methylenedioxy)benzene, allylpentafluorobenzene, and 4-allyl-2-methoxy-1- trimethylsiloxybenzene with D4H in the presence of Karstedts-catalyst or platinum black under mild conditions leading quantitatively to functionalized tetramethylcyclosiloxanes 3.
reported. On the basis of a study of platinum- and rhodium complexes in the reactions between TMDSO and selected olefins containing C=C bond, it was possible to choose the most efficient catalyst whose application in the solvent-free system led to selective mono-functionalization of the disiloxane reagent and simultaneous formation of only β-regioisomeric products, bearing in their structure functional