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<p>CSV import</p> <p><b>New page</b></p><div>{{short description|Chemical compounds with a spiro-connected ketal structure}}<br /> <br /> &#039;&#039;&#039;Spiroketals&#039;&#039;&#039; are a class of organic compounds characterized by a [[spiro]]-connected [[ketal]] structure. These compounds are significant in both natural products and synthetic chemistry due to their unique structural features and biological activities.<br /> <br /> ==Structure==<br /> [[File:Spiroketal-1,7dioxaspiro(5,5)undecane.png|thumb|right|Structure of a simple spiroketal: 1,7-dioxaspiro(5,5)undecane]]<br /> Spiroketals consist of two [[cyclic]] [[ether]] rings that share a single [[carbon]] atom, known as the spiro center. This spiro center is typically a [[quaternary carbon]] atom, which is bonded to two [[oxygen]] atoms, each part of a different ring. The rings can vary in size, but common configurations include six-membered and five-membered rings.<br /> <br /> ==Synthesis==<br /> The synthesis of spiroketals can be achieved through various methods, including [[acid-catalyzed]] [[ketalization]] of [[diols]] with [[ketones]] or [[aldehydes]]. Another common method involves the [[ring-closing metathesis]] of suitable precursors.<br /> <br /> [[File:Ring_closure.png|thumb|left|Illustration of a ring closure reaction forming a spiroketal]]<br /> <br /> ==Biological Significance==<br /> Spiroketals are found in a variety of [[natural products]], many of which exhibit significant biological activity. These include [[antibiotics]], [[antifungal]] agents, and [[insect pheromones]].<br /> <br /> ===Examples===<br /> One notable example of a spiroketal-containing compound is the [[avermectin]] family of [[antiparasitic]] agents.<br /> <br /> [[File:Avermectins_skeletal.svg|thumb|right|Skeletal structure of avermectins, which contain spiroketal moieties]]<br /> <br /> ==Applications==<br /> Due to their biological activities, spiroketals are of interest in the development of new [[pharmaceuticals]]. They are also used as [[chiral]] building blocks in [[asymmetric synthesis]].<br /> <br /> ==Related Compounds==<br /> Spiroketals are related to other spiro compounds, such as [[spiroacetal]]s and [[spirooxindole]]s, which also feature a spiro-connected structure but differ in the functional groups present.<br /> <br /> ==Related Pages==<br /> * [[Spiro compound]]<br /> * [[Ketal]]<br /> * [[Avermectin]]<br /> * [[Asymmetric synthesis]]<br /> <br /> [[Category:Organic compounds]]<br /> [[Category:Heterocyclic compounds]]<br /> [[Category:Natural products chemistry]]</div>

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