Isoquinoline
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Isoquinoline is an individual chemical specimen - a heterocyclic aromatic organic compound - as well as the name of a family of many thousands of natural plant alkaloids, any one of which might be referred to as "an isoquinoline". It is a structural isomer of quinoline. Isoquinoline and quinoline are benzopyridines, which are composed of a benzene ring fused to a pyridine ring. In a broader sense, the term isoquinoline is used to make reference to isoquinoline derivatives. 1-Benzylisoquinoline is the structural backbone in many naturally occurring alkaloids such as papaverine. The isoquinoline ring in these natural compound derives from the aromatic amino acid tyrosine.[3][4][5][6][7][8]
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Names | |||
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Preferred IUPAC name
Isoquinoline[1] | |||
Other names
Benzo[c]pyridine 2-benzazine | |||
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ECHA InfoCard | 100.003.947 | ||
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Properties | |||
C9H7N | |||
Molar mass | 129.162 g·mol−1 | ||
Appearance | Colorless oily liquid; hygroscopic platelets when solid | ||
Density | 1.099 g/cm3 | ||
Melting point | 26–28 °C (79–82 °F; 299–301 K) | ||
Boiling point | 242 °C (468 °F; 515 K) | ||
Acidity (pKa) | pKBH+ = 5.14[2] | ||
−83.9·10−6 cm3/mol | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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