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Spiro compound
 
 
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A spiro compound is a bicyclic organic compound
Organic compound

An organic compound is any member of a large class of chemical compounds whose molecules contain carbon. For historical reasons discussed below, a few types of compounds such as carbonates, simple oxides of carbon and cyanides, as well as the allotropes of carbon, are considered Inorganic compound....
 with rings connected through just one atom. The rings can be different in nature or identical. The connecting atom is also called the spiroatom, most often a quaternary carbon ("spiro carbon"). All spiro compounds have the infix
Infix

An infix is an affix inserted inside a stem . It contrasts with adfix, a rare term for an affix attached to the outside of a stem, such as a prefix or suffix....
 spiro followed by square brackets [] containing the number of atoms in the smaller ring and the number of atoms in the larger ring excluding the spiroatom itself.






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A spiro compound is a bicyclic organic compound
Organic compound

An organic compound is any member of a large class of chemical compounds whose molecules contain carbon. For historical reasons discussed below, a few types of compounds such as carbonates, simple oxides of carbon and cyanides, as well as the allotropes of carbon, are considered Inorganic compound....
 with rings connected through just one atom. The rings can be different in nature or identical. The connecting atom is also called the spiroatom, most often a quaternary carbon ("spiro carbon"). All spiro compounds have the infix
Infix

An infix is an affix inserted inside a stem . It contrasts with adfix, a rare term for an affix attached to the outside of a stem, such as a prefix or suffix....
 spiro followed by square brackets [] containing the number of atoms in the smaller ring and the number of atoms in the larger ring excluding the spiroatom itself. For example compound A is called 1-bromo-3-chlorospiro[4.5]decan-7-ol and compound B is called 1-bromo-3-chlorospiro[3.6]decan-7-ol. The spiro compound consisting of a cyclohexane
Cyclohexane

Cyclohexane is a cycloalkane with the molecular formula Carbon6Hydrogen12. Cyclohexane is used as a nonpolar solvent for the chemical industry, and also as a raw material for the industrial production of adipic acid and caprolactam, both of which are intermediates used in the production of nylon....
 ring and a cyclopentane
Cyclopentane

Cyclopentane is a highly flammable alicyclic compound hydrocarbon with chemical formula 510 and CAS number 287-92-3, consisting of a ring of five carbon atoms each bonded with two hydrogen atoms above and below the plane....
 ring is called spiro[4.5]decane. This nomenclature
IUPAC nomenclature

IUPAC nomenclature is a system of naming chemical compounds and of describing the science of chemistry in general. It is developed and kept up to date under the auspices of the International Union of Pure and Applied Chemistry ....
 was proposed by Adolf von Baeyer
Adolf von Baeyer

Johann Friedrich Wilhelm Adolf von Baeyer was a Germany chemistry who synthesized indigo dye, and was the 1905 recipient of the Nobel Prize in Chemistry....
 in 1900 . An example of a spiro compound with a trivial name: spiropentadiene
Spiropentadiene

Spiropentadiene, or bowtiediene, is a hydrocarbon with formula C5H4. The simplest spiro-connected cycloalkene, it is very unstable due to its high angle strain and does not occur in nature....
.

Polyspiro compounds