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- W3046330171 abstract "Thermally induced intra-/intermolecular [3 + 2] cycloaddition reaction sequences of alpha-(alkynyloxy)silyl-alpha-diazoacetates 1 lead to [3.3](1,4)pyrazolophanes (2)2 and higher cyclooligomers thereof [(2)n, n > 2]. In most cases, the cyclodimer was isolated by crystallization, while a complete separation of the mixture of the higher cyclooligomers was not possible. Solid state structures of cyclodimers (2b)2 and (2c)2, cyclotrimer (2b)3, and cyclotetramer (2e)4 were determined by X-ray diffraction analysis. Field-desorption mass spectra were used to characterize the cyclooligomer mixtures. The relative amounts of the cyclooligomers depend on the substitution pattern of the diazo compound. The cyclooligomerization reactions reported herein demonstrate, for the first time, the involvement of diazo functions in macrocyclization reactions via 1,3-dipolar cycloaddition." @default.
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- W3046330171 date "2000-05-02" @default.
- W3046330171 modified "2023-09-23" @default.
- W3046330171 title "Macrocyclization of -(Alkynyloxy)silyl--diazoacetates by Inter-/Intramolecular [3+2] Cycloaddition Reaction Sequences" @default.
- W3046330171 doi "https://doi.org/10.1002/(sici)1521-3765(20000502)6:9<1646::aid-chem1646>3.3.co;2-3" @default.
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