J. Chem. Soc., Perkin Trans. 2, 1986, 1255 - 1258,
Nouria Al-Awadi and Roger Taylor
The mechanism of thermal eliminations. Part 18. Relative rates of pyrolysis of 2-ethoxypyrazine, 3-ethoxypyridazine, 2- and 4-ethoxypyrimidine, 3-chloro-6-ethoxypyridazine, and 2-chloro-4-ethoxypyrimidine: the effect of the aza substituent and -bond order on the elimination rate
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http://dx.doi.org/10.1039/P29860001255