申请人:The B. F. Goodrich Company
公开号:US04484010A1
公开(公告)日:1984-11-20
Hindered hydroxybenzylcyclopentadienes and derivatives thereof, useful as antioxidants, are prepared by reacting cyclopentadiene, an alkali metal, and a hindered p-methylphenol having a displaceable group attached to the methyl group in the presence of a non-protic solvent; or in one step, by reacting cyclopentadiene, hindered phenol that is devoid of a group in the para position, formaldehyde, an amine, water, and an alkali metal hydroxide in the presence of a phase transfer catalyst; or in one step, by reacting cyclopentadiene and a hindered substituted p-methyl-phenol containing a displaceable group, in the presence of a non-protic solvent, water, an alkali metal hydroxide and a phase transfer catalyst. These compounds readily dimerize whereas the bis compounds are prepared in presence of an excess amount of the substituted p-methylphenol.
通过在非质子溶剂中反应环戊二烯、碱金属和具有可位移基团的受阻p-甲基酚,制备出作为抗氧化剂有用的受阻羟基苯基环戊二烯及其衍生物;或者在一个步骤中,在相转移催化剂的存在下,通过反应环戊二烯、缺乏对位基团的受阻酚、甲醛、胺、水和碱金属氢氧化物来制备;或者在一个步骤中,在非质子溶剂、水、碱金属氢氧化物和相转移催化剂的存在下,通过反应环戊二烯和含有可位移基团的受阻取代p-甲基酚来制备。这些化合物容易二聚,而双聚化合物则在过量的取代p-甲基酚存在下制备。