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This article is an orphan, as few or no other articles link to it. Please introduce links to this page from related articles; suggestions may be available. (May 2009) Azetidine-2-carboxylic Acid[1] IUPAC name Azetidine-2-carboxylic Acid Identifiers CAS number 2133-34-8 Y ChemSpider 15628 SMILES   O=C(O)[C@H]1NCC1 InChI   InChI=1/C4H7NO2/c6-4(7)3-1-2-5-3/h3,5H,1-2H2,(H,6,7)/t3-/m0/s1 InChI key   IADUEWIQBXOCDZ-VKHMYHEABQ Properties Molecular formula C4H7NO2 Molar mass 101.104 g/mol Appearance crystalline solid Density 1.275 g/cm³ Melting point 215 °C, 488 K, 419 °F Boiling point 242 °C, 515 K, 468 °F Solubility in water 5.0 g/100 ml Hazards Flash point 100.1 °C Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox references Azetidine-2-carboxylic acid (abbreviated Aze) is a plant non-protein amino acid homologue of proline with the molecular formula C4H7NO2. Aze is a heterocyclic, 4 membered ring with nitrogen as its heteroatom (an azetidine), and a carboxylic acid group substituted on one of the ring carbon atoms. The main difference between Aze and proline is the ring of Aze has four members and the ring of proline has five.[2] Aze has the ability to act as an analog of proline and can be incorporated into proteins in place of proline. Contents 1 Synthesis 2 Occurrence 3 Toxicity 4 References // Synthesis Optically inactive Aze was obtained in small yield from γ-aminobutyric acid by α-bromination, followed by removal of hydrogen bromide from the intermediate γ-amino-α-butyric acid and ring closure by treatment with a barium hydroxide solution. An optically active Aze was obtained by treatment of αγ-diaminobutyric acid dihydrochloride with a mixture of nitrous and hydrochloric acids to yield γ-amino-α-chlorobutyric acid, followed by elimintation of hydrogen chloride and cyclization by treatment with barium hydroxide.[3] Occurrence Azetidine-2-carboxylic acid has been known since 1955 to be present in rhizomes and fresh foliage of certain plants. It is known to occur in one species, Convallaria majalis (lily of the valley), from the lily family, Liliaceae, and one species, Polygonatum officinale, from the flowering plant family, Ruscaceae. Lily of the Valley Aze is also found in numerous plants from the family Fabaceae, and has also been detected in small quantities in table beets, garden beets, and sugar beets.[4] Toxicity It has been shown that when Azetidine-2-carboxylic acid is misincorporated into proteins in place of proline, Aze deters the growth of competing vegetation and poisons predators. Other studies have shown effects of Aze resulting in a wide range of toxic and teratogenic disorders, including in a range of malformations, in various animal species including ducks, hamsters, mice, and rabbits. [2] Misincorporation of Aze into human proteins can alter collagen, keratin, hemoglobin, and protein folding.[5]However, the lack of detailed toxicologic data and the need for more direct evidence about the damaging effects of the misincorporation of Aze on specific proteins are reasons why the toxicity of Aze to humans cannot be determined at this time.[2] References ^ Merck Index, 12th Edition, 6089. ^ a b c Rubenstein E., T. McLaughlin, R.C. Winant, A. Sanchez, M. Eckart, K.M. Krasinska, A. Chien. (2008). "Azetidine-2-carboxylic Acid in the Food Chain". Phytochemistry: 1–5.  ^ Fowden, L. (1956). "Azetidine-2-carboxylic Acid: a New Cyclic Imino Acid Occurring in Plants". Biochemical Journal: 323–331.  ^ Seigler, David S. (1998). "Plant Secondary Metabolism". Science: 222.  ^ Rubenstein E., H. Zhou, K.M. Krasinska, A. Chien, C.H. Becker. (2006). "Azetidine-2-carboxylic Acid in Garden Beets". Phytochemistry: 898–903.