Oxetane and azetidine exhibit significantly lower reactivity compared to their three-membered counterparts, yet they still undergo analogous ring-opening reactions.

Reacion-1:

Concentrated hydrochloric acid causes azetidine to open when heated.

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Reacion-2:

Nucleophiles readily react with azetidinium ions.

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Reacion-3:

An azetidine's reaction with a chloroformate can yield either the dealkylated heterocycle or the ring-opened product (γ-chloroamine).

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See also:

References:

[1]Antermite D, Degennaro L, Luisi R. Recent advances in the chemistry of metallated azetidines[J]. Organic & Biomolecular Chemistry, 2017, 15(1): 34-50.

[2]Reidl T W, Anderson L L. Divergent Functionalizations of Azetidines and Unsaturated Azetidines[J]. Asian Journal of Organic Chemistry, 2019, 8(7): 931-945.

[3]Couty F, Evano G. Azetidines: new tools for the synthesis of nitrogen heterocycles[J]. Synlett, 2009, 2009(19): 3053-3064.