By Larry E. Overman (auth.), Dieter Schinzer (eds.)
The ASI workshop on "Selectivities in Lewis Acid Promoted Reactions" held within the Emmantina-Hotel in Athens-Glyfada, Greece, October 2-7, 1988 was once held to carry a few gentle into the darkness of Lewis acid brought on approaches. As such the workshop displays a few present traits in natural synthesis, the place Lewis acids have gotten a strong instrument in lots of varied glossy reactions, e.g. Diels-Alder reactions, Ene reactions, Sakurai reactions, and quite often silicon and tin chemistry. the target of this assembly used to be to collect lots of the international specialists within the box to debate the key reactions promoted by way of Lewis acids. natural synthesis will play a massive position during this e-book attached with a few primary mechanistic paintings on allylsilane and -tin chemistry. either average product synthesis and unnatural molecules are provided within the chapters. The publication offers all of the 15 invited lectures and the contributions of 15 posters. i'm convinced that the cloth provided during this ebook will stimulate the chemistry, which has been mentioned on our assembly, around the globe. The assembly and the publication have been purely attainable via a supply of the NATO medical Affairs Devision and monetary help through the subsequent businesses: Kali Chemie (Hannover, W-Germany), E. Merck (Darmstadt, W-Germany), Sandoz (Basel, Switzerland), Schering (Berlin, W-Germany).
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Extra resources for Selectivities in Lewis Acid Promoted Reactions
Abstr. 54, 10851 e (1960). A. Hosomi, M. Endo, H. Sakurai, Chern. Lett. 941 (1976). A. Cambanis, E. Bauml, H. Mayr, Synthesis, submitted for publication. F. C. E. A. A. Chalmers, Tetrahedron Lett. 81 (1978); b) C. Duschek, B. Drews, M. Muehlstaedt, Ger. (East) Pat. 115,650 [Chern. Abstr. 87, 5391j (1977) ]. 36 25) K. Yamamoto, O. Nunokawa, J. H. K. Lau, W. Mychajlowskij, Tetrahedron Lett. 3317 (1977); c) K. Yamamoto, J. T. Qui, J. Tsuji, Chern. Lett. 859 (1978); d) K. Yamamoto, M. Ohta, J. Tsuji, Chern.
Org. Chern. 1987,52,4635. CONTROL OF ElECTROPHILICITY IN ALIPHATIC FRIEDEL CHAFfS REACTIONS Herbert Mayr Institut fur Chemie der Medizinischen Universitat zu Lubeck, Ratzeburger Allee 160, D-2400 Lubeck 1, Federal Republic of Germany ABSTRACT. g. R-X + P'-'X) represent a straightforward method for the formation of CC"'bonds, if the consecutive addition of the 1:1 adduct to another alkene molecule can be inhibited. This article describes how the relative electrophilicities of reactants RX and products PX may be controlled by nature and quantity of the Lewis acid.
0 mL of 1 M titanium tetrachloride in CH2Cl2 at -78°C. The mixture was allowed to stir until the temperature dropped to -100°C. 00 mmol, 372 mg) derived from 3-methylcrotonate in 10 mL of CH2Cl2 was then added dropwise with stirring. After the addition was complete, the cold bath was removed from the reaction vessel and the reaction mixture was allowed to warm slowly to room temperature for 8 to 12 hrs with stirring. This black-brown mixture was then quenched with water, extracted with CH2Cl2, filtered through a pad of celite, and dried over anhydrous magnesium sulfate.
Selectivities in Lewis Acid Promoted Reactions by Larry E. Overman (auth.), Dieter Schinzer (eds.)