Many such compounds have been described.

Particularly common spiro compounds are ketal (acetal) formed by condensation of cyclic ketones and diols and dithiols. A simple case is the acetal 1,4-dioxaspiro[4.5]decane from cyclohexanone and glycol. Cases of such ketals and dithioketals are common.

Chirality

Spiranes can be chiral,

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