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(Aminoethynyl) Metallations, 18. - Reactions of (Stannylethynyl) and (Silylethynyl) Ethers with Acylketenes
Himbert, Gerhard,Henn, Lothar
, p. 771 - 776 (2007/10/02)
(Stannylethynyl) ethers 1 react with tert-butylcyanoketene (2) to give the (stannyloxyvinyl)yne ethers 4.Reaction with an educt ratio of 1:2 furnishes via the primarily formed zwitterion 3 (=1,4-dipole) the dioxine derivatives 6 which lose their stannyl g
