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- W2078634526 abstract "Durch Umsetzung von Carbenchrom- und -eisenkomplexen 1a bzw. 1b mit funktionalisierten Allenen H2CCCHCH2Y 2 (Y = OH, CO2Et, CH2OH) wurden unter Insertion von 2 in die MC-Bindung von 1 Tri(methylen)methan-Komplexe 3 in guten Ausbeuten erhalten. Die Stereochemie dieser Schlusselreaktion hangt stark vom jeweiligen Metallrest ab. Beim (oktaedrischen) Chromkomplex 1a entsteht mit hoher Selektivitat jeweils nur ein Stereoisomer 3-A, beim (trigonal-bipyramidalen) Eisenkomplex hingegen ein Gemisch aus Diastereomeren 3-A–C. Andererseits bildet der Carbeneisenkomplesx 1b mit 2 selektiv nur Tri(methylen)methan-Komplex 3, der Carbenchromkomplex 1a hingegen zusatzlich ein Metatheseprodukt 4.Organic Syntheses via Transition Metal Complexes, 36. — Monofunctional Tri(methylene)methane Chromium and Iron Complexes by Addition of Allenes to M C Bonds of carbene ComplexesThe reaction of carbenechromium and -iron complexes 1a and 1b with monofunctional allenes H2CCCHCH2Y 2 (Y = OH, CO2Et, CH2OH) leads to the formation of tri(methylene)-methane complexes 3 in good yields with insertion of 2 into the MC bond of 1. The stereochemistry of this key reaction is markedly influenced by the metal moiety. Thus, with the (octahedral) chromium complex 1a only one stereoisomer 3-A is obtained, but with the (trigonal-bipyramidal) iron complex 1b a mixture of diastereomers 3-A–C is formed. On the other hand, the iron complex 1a yields 3 as the only product, while the chromium complex 1b in addition to 3 also gives an enol ether 4 by a metathesis reaction." @default.
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- W2078634526 date "1989-10-01" @default.
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- W2078634526 title "Organische Synthesen mit Übergangsmetallkomplexen, 36: Funktionalisierte Tri(methylen)methan-Chrom- und Eisenkomplexe durch Addition von Allenen an M C-Bindungen von Carbenkomplexen" @default.
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- W2078634526 doi "https://doi.org/10.1002/cber.19891221024" @default.
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