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The two crystal forms for racemic menthol have melting points of 28 °C and 38 °C. Pure (−)-menthol has four crystal forms, of which the most stable is the α form, the familiar broad needles. Pure (−)-menthol has four crystal forms, of which the most stable is the α form, the familiar broad needles.
This page provides supplementary chemical data on Menthol. ... (DL or racemic form) Fisher MSDS ... data relate to Standard temperature and pressure.
But the pure enantiomer can have a higher or lower melting point than the compound. A special case of racemic compounds are kryptoracemic compounds (or kryptoracemates), in which the crystal itself has handedness (is enantiomorphic), despite containing both enantiomorphs in a 1:1 ratio. [8] Pseudoracemate (sometimes racemic solid solution)
This creates a 1:1 molar ratio of enantiomers and is referred to as a racemic mixture (i.e. contain equal amount of (+) and (−) forms). Plus and minus forms are called Dextrorotation and levorotation. [1] The D and L enantiomers are present in equal quantities, the resulting sample is described as a racemic mixture or a racemate. Racemization ...
The eutectic alloy with fineness exactly 719 will reach liquidus line, and therefore melt entirely, at that exact temperature without any further rise of temperature till all of the alloy has melted. Any silver with fineness between 80 and 912 but not exactly 719 will also reach the solidus line at exactly 780 °C, but will melt partly.
Melting point: 208 °C (406 °F; 481 K) ... a racemic mixture of camphor is used, ... It also generates a TRPM8-mediated cooling sensation similar to menthol.
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The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.