首页>
外国专利>
Azoxy cpds prepn by reducing nitro cpds - using polystyrene-supported metal complex catalyst, giving high yields
Azoxy cpds prepn by reducing nitro cpds - using polystyrene-supported metal complex catalyst, giving high yields
展开▼
机译:通过使用聚苯乙烯负载的金属络合物催化剂还原硝基cpds来制备甲氧基cpds
展开▼
页面导航
摘要
著录项
相似文献
摘要
Catalytic reduction of aromatic nitro cpds. into azoxy derivs. is effected by reaction in an anhydrous alcohol (pref. EtOH) under an inert atmos with a strongly reducing hydrogen cpd. (pref. NaBH4) in presence of a polystyrene supported metal complex catalyst of formula (I): where L is -CH2-PPh2 or -PPh2; M is Ni(prefd) or Co; X is Cl (prefd.) or Br), the polystyrene being a homopolymer or copolymer with a divinyl aromatic cpd. The prods. are inters., e.g. for dyes. The process gives high yields (e.g. 35-85% c.f. 15% with unsupported PPh2NiCl2 catalyst) of pure product. Catalyst may be recovered and reused.
展开▼