Process for preparation of quaternary ammonium and phosphonium s

Details Process for preparation of quaternary ammonium and phosphonium s Process for preparation of quaternary ammonium and phosphonium s

1988-11-16

1991-01-29

Lee, Mary C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

544158, 544383, 544384, 544399, 546301, 546342, 548551, 548556, 548573, 558270, 558271, C07D21142, C07D21146, C07C14326

Patent

active

049888170

ABSTRACT:
A process is provided for obtaining quaternary ammonium or phosphonium substituted carbonic acid esters. The first step involves reacting the hydroxyl predecessor compound of the ester with phosgene in an aprotic organic solvent to obtain a solution of chloroformate/hydrogen chloride complex. In a second step, the chloroformate/hydrogen chloride complex in solution is admixed with a salt whose conjugate anion, normally a phenol sulfonate, has structure L. During the admixing step, pH is maintained no lower than 6 until all reactants have been combined to form the product ester. Thereupon, pH is lowered to less than 5.5 to stabilize product against hydrolysis.

REFERENCES:
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patent: 3839395 (1974-10-01), Otsuka et al.
patent: 4686061 (1987-08-01), Nollet et al.
patent: 4751015 (1988-06-01), Humphreys et al.
patent: 4818426 (1989-04-01), Humphreys et al.
patent: 4931563 (1990-06-01), Madison et al.
European Search Report and Annex, EP No. 89 20 2735.

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