Conclusions
-
1.
In contrast to the case of cyanoacetylene, the nucleophilic addition to methyl propiolate takes place with the preferential or exclusive formation of trans products, if steri cally hindered N-nucleophiles and N-, P-, S-nucleophiles with a weakened +M-effect of the central heteroatom are used.
-
2.
For the qualitative evaluation of the stereochemical result of the nucleophilic addition reaction to activated acetylenes, it was proposed to use the σR constant of the activating substituent.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 382–391, Februar, 1988.
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Él'natanov, Y.I., Kostyanovskii, R.G. Reactions of N-, P-, and S-nucleophiles with methyl propiolate. Russ Chem Bull 37, 302–311 (1988). https://doi.org/10.1007/BF00957431
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DOI: https://doi.org/10.1007/BF00957431