1,2-Dihydro-1,2-azaborine

1,2-Dihydro-1,2-azaborine

Identifiers
CAS Number	6680-69-9
ChEBI	CHEBI:38583
ChemSpider	24769701
InChI InChI=1S/C4H6BN/c1-2-4-6-5-3-1/h1-6H Key: OGZZEGWWYQKMSO-UHFFFAOYSA-N
Properties
Chemical formula	C4H6BN
Molar mass	78.908 g mol^−1
Appearance	clear, colorless liquid
Melting point	−46 to −45 °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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Infobox references

1,2-Dihydro-1,2-azaborine is an aromatic chemical compound with properties intermediate between benzene and borazine. Its chemical formula is C₄BNH₆. It resembles a benzene ring, except that two adjacent carbons are replaced by nitrogen and boron, respectively.

After decades of failed attempts, the compound was synthesized in 2008 and reported in January 2009.^[1][2]

One of the synthetic steps is a ring-closing metathesis (RCM) reaction:^[3]

References

1. Stu Borman. "Long-Sought Benzenelike Molecule Created: Aromaticity of organic-inorganic hybrid resembles benzene's." C&EN January 5, 2009 Volume 87, Number 01 p. 11
2. A. J. V. Marwitz, M. H. Matus, L. N. Zakharov, D. A. Dixon, S.-Y. Liu (January 2009). "A Hybrid Organic/Inorganic Benzene". Angew. Chem. Int. Ed. 48 (5): 973–977. doi:10.1002/anie.200805554. PMID 19105174.
3. TBS = tert-butyldimethylsilyl, step 2 RCM = ring-closing metathesis using Grubbs' catalyst, step 3 organic oxidation using palladium on carbon, step 4 reduction LiBHEt₃, step 5 conversion to piano stool complex as protective group with chromium carbonyl derivative, step 6 cleavage N-TBS bond HF, step 7 deprotection with triphenylphosphine