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Are there any chemical compounds that disintegrate (without going into other chemical reactions; let's say in a vacuum) before reaching a melting temperature?

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Some compounds decompose before they reach the melting point. In the literature, you'll see something like "m.p. $40\ ^{\circ}\mathrm{C}$ (dec.)"

Ammonium chloride is an example.

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  • $\begingroup$ + Sugars, proteins, and a lot of others. Some of these can be molten under pressure. $\endgroup$ – Karl Dec 8 '16 at 23:07

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