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Updated: Jun 1, 2026

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
Published on: January 19, 2016
Methyl 2-(4,6-dichloro-1,3,5-triazin-2-yl-amino)acetate
Abstract:
The title compound, C(6)H(6)Cl(2)N(4)O(2), was prepared by the nucleophilic substitution of 2,4,6-trichloro-1,3,5-triazine by glycine methyl ester hydro-chloride, and was isolated from the reaction by using flash chromatography. The crystal structure at 150 K reveals the presence two crystallographically independent mol-ecules in the asymmetric unit which differ in the orientation of the pendant methoxy-carbonyl group. Each mol-ecular unit is engaged in strong and highly directional N-H⋯N hydrogen-bonding inter-actions with a symmetry-related mol-ecule, forming supra-molecular dimers which act as the synthons in the crystal packing.
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Acidity of 1-Alkynes
The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.

