By G. Wilke (auth.), Prof. Dr. Helmut Werner, Prof. Dr. Gerhard Erker (eds.)
Organic Synthesis through Organometallics is an interdisciplinary venture subsidized by way of the Volkswagen Stiftung to stimulate examine and dialogue of advances within the box. to enhance foreign communique , top specialists are invited to usual symposia. during this quantity, 17 lectures offered on the moment symposium in Würzburg, October 1988, are accumulated. From the subjects coated it enhances the former quantity, edited through A. de Meijere and H. tom Dieck.
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Extra resources for Organometallics in Organic Synthesis 2: Aspects of a Modern Interdisciplinary Field
Example text
We also acknowledge important support by the Deutsche Forschungsgemeinschaft, Bonn, the Fonds der Chemischen Industrie, Frankfurt, the Herbert Quandt-Stiftung der VARTA AG, Bad Homburg, and the HOECHST AG, Frankfurt. 42 References [1] Diazadienes as Controlling Ligands in Catalysis, Part 17. For part 16, see: Ehlers J, Konig WA, Lutz S, Wenz G, tom Dieck H (1988) Angew Chern 100: to appear in november, Angew Chern Int Ed Engl 27: in press; part 15: Mallien M, Haupt ETK, tom Dieck H (1988) Angew Chern 100:1091; Angew Chern Int Ed Engl 27:1062 [2] tom Dieck H, Diercks R, Stamp L, Bruder H, Schuld Th (1987) Chern Ber 120:1943; tom Dieck H, Munz C, Muller C (1987) J Organomet Chern 328:209; tom Dieck H, Kleinwachter I (1987) Z Naturforsch 42b:71; Brockmann M, tom Dieck H (1986) J Organometal Chern 314:75; tom Dieck H, Kollvitz W, Kleinwachter I (1986) Organometallics 5:1449; Svoboda M, tom Dieck H, Kruger C, Tsay Y-H (1981) Z Naturforsch 36b:814; tom Dieck H, Kinzel A (1979) Angew Chern 91:344; Angew Chern Int Ed Engl 18:324; tom Dieck H, Franz K-D, Hohmann F (1975) Chern Ber 108: 163 [3] Benedix R, Birner P, Birnstock F, Hennig H, Hofmann H-J (1979) J Mol Struct 51:99; Borgen 0, Mestvedt B, Skauvik I (1976) Acta Chern Scand Ser A 30:43.
C><): I - E I ==( EC:CE ~ E E~E ~ I E E 37 3 39 38 40a Scheme 9 Some Analogies and Differences in the Platinum System The chemistry of (DAD)platinum is intriguing anyhow. While methoxyallene gives the expected five-membered palladacycle 41 in a typical reaction in the presence of ECaCE, a completely different product 42 is obtained with Pt(dba)z, DAD and the allene. A formal elimination of dimethyl ether has taken place. In the presence of ECECE another unexpected product 43 is found, which contains the same fragments from the allene, incorporated in a nine-membered ring.
I X E 13 - ~ / ~N/ I E 25 Reactions with Olefins Some years ago, Itoh et al. have already described the reaction of EC=CE with olefins on palladium with and without additional phosphines [12]. Palladacyclopentenes 16 were postulated as intermediates in the very slow formation of the cyclic 2:1 codimers (1,3-cyclohexadienes 17) or the linear 1:2 codimers 18 as well. Trost et al have recently also described some intramolecular palladium-catalyzed enyne cyclizations, in which metallacyclopentenes of Pd(IV) were postulated as intermediates [13].