How is Tributyl(tetradecyl)phosphonium chloride (CAS: 81741-28-8) typically synthesized?

Tributyl(tetradecyl)phosphonium chloride can be synthesized through the reaction of tetradecylphosphoric acid with butyl halides, such as n-butyl bromide. This process typically yields a high purity product with good selectivity. The reaction is usually conducted under mild conditions and involves the substitution of the phosphate group with butyl groups. The yield is generally around 85-90%.