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Removal of the BOC group in amino acids can be accomplished with strong acids such as trifluoroacetic acid in dichloromethane, or with HCl in methanol. [2] [3] [4] A complication may be the tendency of the t-butyl cation intermediate to alkylate other nucleophiles; scavengers such as anisole or thioanisole may be used.
Glycine methyl ester hydrochloride can be prepared by treatment of glycine with 2 equivalents of trimethylsilyl chloride, followed by the addition of methanol. [2] [3] Upon treatment with base, the salt converts to glycine methyl ester. [4]
61.2 3.88 –63.5 –4.90 K b & K f [1] Cyclohexane: 80.74 2.79 6.55 –20.2 Diethyl ether: 0.713 34.5 2.16 –116.3 –1.79 K b & K f [1] Methanol [4] 0.79 64.7 Ethanol: 0.78 78.4 1.22 –114.6 –1.99 K b [2] Ethylene bromide: 2.18 133 6.43 9.974 –12.5 K b & K f [1] Ethylene glycol: 1.11 197.3 2.26 −12.9 –3.11 K b & K f [1] Formic acid ...
The data include the composition of a mixture by weight (in binary azeotropes, when only one fraction is given, it is the fraction of the second component), the boiling point (b.p.) of a component, the boiling point of a mixture, and the specific gravity of the mixture. Boiling points are reported at a pressure of 760 mm Hg unless otherwise stated.
Hydrogen cyanide [2] 11.29 0.0881 Hydrogen fluoride [2] 9.565 0.0739 Hydrogen iodide [2] 6.309 0.0530 Hydrogen selenide: 5.338 0.04637 Hydrogen sulfide: 4.490 0.04287 Isobutane [2] 13.32 0.1164 Iodobenzene: 33.52 0.1656 Krypton: 2.349 0.03978 Mercury: 8.200 0.01696 Methane: 2.253 0.04278 Methanol: 9.649 0.06702 Methylamine [2] 7.106 0.0588 Neon ...
Coefficients for partition between water and solvents wet/dry solvent c e s a b v source w 1-butanol: 0.376 0.434 -0.718 -0.097 -2.350 2.682 [1]w
In general terms, any solvent that contains a labile H + is called a protic solvent. The molecules of such solvents readily donate protons (H +) to solutes, often via hydrogen bonding. Water is the most common protic solvent. Conversely, polar aprotic solvents cannot donate protons but still have the ability to dissolve many salts. [1] [2]
CaCO 3 + 2 HCl → CaCl 2 + CO 2 + H 2 O Many chemical reactions involving hydrochloric acid are applied in the production of food, food ingredients, and food additives . Typical products include aspartame , fructose , citric acid , lysine , hydrolyzed vegetable protein as food enhancer, and in gelatin production.