Process of alkoxy and aryloxy isothiocyanate preparation

Details Process of alkoxy and aryloxy isothiocyanate preparation Process of alkoxy and aryloxy isothiocyanate preparation

1992-07-27

1993-03-16

Richter, Johann

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

Organic compounds

Carboxylic acid esters

560148, C07C12504

Patent

active

051946734

ABSTRACT:
Alkoxy and aryloxy isothiocyanates are produced by the reaction of a haloformate and an alkali or alkaline earth metal thiocyanate in the presence of water and (i) a catalyst comprising a six membered mononuclear or ten membered fused polynuclear aromatic, heterocyclic compound having 1 or 2 nitrogen atoms as the only hetero atoms in the ring and (ii) a co-catalyst comprising an alkali metal or alkaline earth metal salt of an acid having a pKa of about 10.sup.-3 or below. The co-catalyst accelerates the reaction rate, increases product purity and reduces the adverse effects of impurities in certain grades of the thiocyanate reactants.

REFERENCES:
patent: 4778921 (1988-10-01), Lewellyn et al.

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