alt=Methamphetamine hydrochloride<unk>  is a chiral compound with two enantiomers, dextromethamphetamine and levomethamphetamine. At room temperature, the free base of<unk>  is a clear and colorless liquid with an odor characteristic of geranium leaves. It is soluble in diethyl ether and ethanol as well as miscible with chloroform. In contrast, the<unk>  hydrochloride salt is odorless with a bitter taste. It has a melting point between and, at room temperature, occurs as white crystals or a white crystalline powder. The hydrochloride salt is also freely soluble in ethanol and water. Its crystal structure is monoclinic with P21 space group; at , it has lattice parameters a = 7.10 Å, b = 7.29 Å, c = 10.81 Å, and β = 97.29°. Degradation A 2011 study into the destruction of<unk>  using bleach showed that effectiveness is correlated with exposure time and concentration. A year-long study (also from 2011) showed that<unk>  in soils is a persistent pollutant. In a 2013 study of bioreactors in wastewater,<unk>  was found to be largely degraded within 30 days under exposure to light. Synthesis Racemic<unk>  may be prepared starting from phenylacetone by either the Leuckart or reductive amination<unk> ods. In the Leuckart reaction, one equivalent of phenylacetone is reacted with two equivalents of to produce the formyl amide of<unk>  plus carbon dioxide and<unk> ylamine as side products. In this reaction, an iminium cation is formed as an intermediate which is reduced by the second equivalent of . The intermediate formyl amide is then hydrolyzed under acidic aqueous conditions to yield<unk>  as the final product. Alternatively, phenylacetone can be reacted with<unk> ylamine under reducing conditions to yield<unk> .
Methamphetamine
Benzphetamine
Amphetamine
Benzyl alcohol
Benzocaine
Cannabis
Cannabis 
Nicotine