申请人:American Cyanamid Company
公开号:US05194673A1
公开(公告)日:1993-03-16
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.
烷氧基和芳基氧基异硫氰酸酯是通过在水和(i)催化剂的存在下,将卤甲酸酯和碱金属或碱土金属硫氰酸盐反应而产生的。该催化剂包括一个含有1或2个氮原子作为环中唯一杂原子的六元单核或十元融合多核芳香杂环化合物,以及(ii)一个共催化剂,该共催化剂包括具有pKa约为10.sup.-3或更低的酸的碱金属或碱土金属盐。共催化剂加速反应速率,提高产品纯度,并减少硫氰酸盐反应物中某些级别的杂质的不良影响。