Borabenzene

Source: Wikipedia, the free encyclopedia.
Borabenzene
Names
Preferred IUPAC name
Borinine
Identifiers
3D model (
JSmol
)
ChemSpider
  • InChI=1S/C5H5B/c1-2-4-6-5-3-1/h1-5H
    Key: HXNZTJULPKRNPR-UHFFFAOYSA-N
  • B1=CC=CC=C1
Properties
C5H5B
Molar mass 75.91 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Borabenzene is a hypothetical

organoboron compound with the formula C5H5B. Unlike the related but highly stable benzene molecule, borabenzene would be electron-deficient. Related derivatives are the boratabenzene
anions, including the parent [C5H5BH]−.

Adducts

Adducts of borabenzene with

Lewis bases
are isolatable. Since borabenzene is unavailable, these adducts require indirect methods. 4-Silyl-1-methoxyboracyclohexadiene is used as a precursor to the borabenzene:

C
5H
5N + MeOBC
5H
5SiMe
3 → C
5H
5N-BC
5H
5 + MeOSiMe3

The pyridine adduct C
5H
5N-BC
5H
5 is structurally related to biphenyl.[1] It is a yellow whereas biphenyl is colorless, indicating distinct electronic structures. The pyridine ligand is tightly bound: no exchange is observed with free pyridine, even at elevated temperatures.

Adducts of borabenzene with pyridine and triphenylphosphine.

The borabenzene-pyridine adduct behaves like a

Diels-Alder reactions.[2]

Borabarrelene synthesis via a Diels-Alder reaction of borabenzene-pyridine adduct

See also

References

  1. doi:10.1002/cber.19851180431
    .
  2. PMID 16774279
    .
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