L.W. Deady, R.A. Shanks, A.D. Campbell S.Y. Chooi
The synthesis of some substituted methyl pyridinecarboxylates. II. Methyl 4-substituted picolinates, methyl 5-substituted picolinates, and methyl 5-substituted nicotinates
Australian Journal of Chemistry 1971 vol. 24 (2) pp.385 – 392
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http://dx.doi.org/10.1071/CH9710385