Will you please explaine what are the alternative low cost reagens for Tetrabutyl ammonium bromide?

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Pavel Pazdera

For PTC or for bromination using Br3-?

Abdel-Nasser Ahmed El-Shorbagi

Please read carefully the following which mentions other phase transfer catalysts

http://en.wikipedia.org/wiki/Phase-transfer_catalyst

here the link on Sigma-Aldrich catalog (with prices):

http://www.sigmaaldrich.com/chemistry/chemistry-products.html?TablePage=16278277. PEGs are industrial "ad hoc" crowns for PTC under S-L conditions.

Writte me more details, I will try you to help.

See this page http://www.phasetransfer.com/suppliers/catdir.htm