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- W2011019684 abstract "Thermally induced intramolecular Diels-Alder cyclisations of (alkynyloxyalkyl)pyrazines to dihydropyranopyridines have been studied in the solvent undecane. The introduction of a phenyl group in the α-position of the 3-butynyloxymethyl side chain leads to a 3–4 fold increase of the reaction rate, while the influence of a γ-phenyl group on the rate is negligible. The (3-butynyloxymethyl)pyrazine reacts about 7 times slower than the (3-propynyloxyethyl)pyrazine, the presence of a trimethylsilyl group at the terminus of the alkyne decreases in general the rate of the intramolecular cyclisations. The mechanisms are discussed." @default.
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- W2011019684 date "1989-01-01" @default.
- W2011019684 modified "2023-10-09" @default.
- W2011019684 title "Intramolecular inverse electron demand Diels-Alder reactions of pyrazines" @default.
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- W2011019684 doi "https://doi.org/10.1016/s0040-4020(01)85132-2" @default.
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