会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 2. 发明授权
    • Hydroxybenzylcyclopentadienes and derivatives thereof
    • 羟基苄基环戊二烯及其衍生物
    • US4484010A
    • 1984-11-20
    • US456921
    • 1983-01-10
    • Robert W. Layer
    • Robert W. Layer
    • C09K15/08C07C27/00C07C37/14C07C39/17C07C39/23C07C67/00
    • C07C39/17C07C39/23C07C2101/10C07C2103/68C07C2103/91
    • 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.
    • 可用作抗氧化剂的受阻羟基苄基环戊二烯及其衍生物通过在非质子溶剂存在下使环戊二烯,碱金属和具有可置换基团的位阻对甲基苯酚与甲基连接而制备; 或在一步中,通过在相转移催化剂的存在下使环戊二烯,在对位没有一个基团的甲醛,胺,水和碱金属氢氧化物的受阻酚反应; 或在一个步骤中,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,使环戊二烯和含有可置换基团的受阻取代的对甲基苯酚进行反应。 这些化合物容易二聚,而双取代化合物是在过量的取代的对甲基苯酚的存在下制备的。