spiro compound

They can be regarded as spiro compounds twice over.

An example of a spiro compound with a trivial name: spiropentadiene.

Spiro compounds have two or more rings that are connected through only one carbon atom.

A spiro compound is a bicyclic organic compound with rings connected through just one atom.

Acetals of cyclic ketones with diols or dithiols are spiro compounds.

Some spiro compounds exhibit axial chirality.

Prospidium chloride is a spiro compound.

Fluorescamine is a spiro compound that is not fluorescent itself, but reacts with primary amines to form highly fluorescent products.

Fenspiride (INN, brand name Pneumorel) is a spiro compound used as a drug in the treatment of certain respiratory diseases.

The spiro compound consisting of a cyclohexane ring and a cyclopentane ring is called spiro[4.5]decane.

At a single atom (spirocyclic, forming a spiro compound) Singly fused rings are the most common, and spiro rings are the least common.

For spiro compounds, terms like spiro[2.4] are used, indicating that there are 3- and 5-membered rings (because the spiro atom itself is not counted) meeting at the spiro atom.

All spiro compounds have the infix 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; the numbers being separated by a dot.

Spiropentadiene was synthesised from bistrimethylsilylpropynone 1 by reaction with p-toluenesulfonylhydrazide to tosylhydrazone 2 followed by treatment with sodium cyanoborohydride to allene 3 and followed by two successive reactions with chlorocarbene generated from methyllithium and dichloromethane to spiro compound 5.