Conclusions
Trialkylsilyl(germanyl)propynals show a lower triple bond polarization compared with their carbon analogs because of the electron acceptor effects of the R substituents and the aldehyde group. This increases the inertness of the C≡C bond towards nucleophiles (RSH, R2NH) and lowers the regioselectivity of dipolar attack. Lowering the relative basicity of the substituted propynals decreases the integrated intensity of the C=0 absorption band and shifts the δ17O signal to low field.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 321–325, February, 1988.
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Medvedeva, A.S., Margorskaya, O.I., Kalikhman, I.D. et al. Substituent effects on the13C and17O NMR, IR, and UV spectral parameters for propynals. Russ Chem Bull 37, 246–249 (1988). https://doi.org/10.1007/BF00957419
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DOI: https://doi.org/10.1007/BF00957419