1057558-12-9

Basic information

• Product Name: 1-(5-tert-butyl-3-formyl-2-hydroxybenzyl)pyridinium bromide
• Synonyms: 1-(5-tert-butyl-3-formyl-2-hydroxybenzyl)pyridinium bromide
• CAS NO: 1057558-12-9
• Molecular Weight: 350.255
• Mol File: 1057558-12-9.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: 1-(5-tert-butyl-3-formyl-2-hydroxybenzyl)pyridinium bromide(CAS DataBase Reference)
• NIST Chemistry Reference: 1-(5-tert-butyl-3-formyl-2-hydroxybenzyl)pyridinium bromide(1057558-12-9)
• EPA Substance Registry System: 1-(5-tert-butyl-3-formyl-2-hydroxybenzyl)pyridinium bromide(1057558-12-9)

Safety Data

• Hazardous Substances Data: 1057558-12-9(Hazardous Substances Data)

Upstream product

• 2725-53-3 2-hydroxy-5-t-butylbenzaldehyde 
• 98-54-4 para-tert-butylphenol 
• 367965-70-6 3-(bromomethyl)-5-(tert-butyl)-2-hydroxybenzaldehyde 
• 110-86-1 pyridine 

Relevant articles and documents

Cooperative Al(salen)-pyridinium catalysts for the asymmetric synthesis of trans-configured β-lactones by [2+2]-cyclocondensation of acylbromides and aldehydes: Investigation of pyridinium substituent effects

The trans-selective catalytic asymmetric formation of β-lactones constitutes an attractive surrogate for anti-aldol additions. Recently, we have reported the first catalyst which is capable of forming trans-β-lactones with high enantioselectivity from aliphatic (and aromatic) aldehyde substrates by cyclocondensation with acyl bromides. In that previous study the concepts of Lewis acid and organic aprotic ion pair catalysis were combined in a salen-type catalyst molecule. Since a pyridinium residue on the salen periphery is essential for high trans- and enantioselectivity, we were interested in the question of whether substituents on the pyridinium rings could be used to further improve the catalyst efficiency, as they might have a significant impact on the effective charges within the heterocycles. In the present study we have thus compared a small library of aluminum salen/bispyridinium catalysts mainly differing in the substituents on the pyridinium residues. As one result of these studies a new catalyst was identified which offers slightly superior stereoselectivity as compared to the previously reported best catalyst. NBO calculations have revealed that the higher stereoselectivity can arguably not be explained by the variation of the effective charge.

Contact ion pair directed Lewis acid catalysis: Asymmetric synthesis of trans-configured β-lactones

Opposites attract. A novel concept for dual-activation catalysis takes advantage of the cooperative action of aprotic contact ion pair catalysis and Lewis acid catalysis. This strategy was used for the first trans-selective catalytic asymmetric [2+2] cycl