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| Names | |||
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| Preferred IUPAC name
Bicyclo[2.1.0]pentane | |||
| Identifiers | |||
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CompTox Dashboard (EPA) |
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| Properties | |||
| C5H8 | |||
| Molar mass | 68.119 g·mol−1 | ||
| Appearance | colorless liquid | ||
| Boiling point | 45.5 ′C | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Housaneorbicyclo[2.1.0]pentane is a saturated cycloalkane with the formula C5H8. It is a colorless, volatile liquid at room temperature. It was named "housane" because of its shape, which resembles a simple drawing of a house. Structurally, the molecule consists of cyclopropane fused to cyclobutane. The synthesis of molecules containing multiple strained rings, such as housane, is a traditional endeavor in synthetic organic chemistry.
The first synthesis of housane was reported by Criegee in 1957, where housane was obtained from the pyrolysis of 2,3-diazabicyclo[2.2.1]hept-2-ene.[1]
Housane can be prepared in several steps starting with cyclopentadiene. Other methods include photolysis of 2,3-diazabicyclo[2.2.1]hept-2-ene, pyrolysis of N-Phenyl-2-oxo-3-azabicyclo[2.2.1]heptane, and addition of methylenetocyclobutene.[2]
The two rings are fused in a cis configuration—this meso compound formally has (1R,4S) absolute stereochemistry. The small size of the two rings prevents the trans isomer from existing, so the stereochemistry is not usually mentioned when discussing this structure.
Housane is easily attacked by bromineoriodine. In the presence of a platinum catalyst at room temperature, it is hydrogenated into cyclopentane. Reaction with hydrogen bromide at lower temperatures affords bromocyclopentane. Housane also reacts with lead tetraacetate, forming cis-1,3-diacetoxycyclopentane among other products.[1]
Housane is thermally quite stable, isomerizing to cyclopentene at 330 °C.[1]
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