摘要:
A method for catalytic production of hydroxylated aromatics by exposing zeolite catalyst to a reducing atmosphere to activate said catalyst, and reacting an aromatic with nitrous oxide in the preanence of said activated catalyst.
摘要:
The present invention relates to the preparation of substituted or unsubstituted 1,2-bis(4-hydroxyphenyl)-hydroxyaliphatics such as 1,2-bis(4-hydroxyphenyl)-2-hydroxypropanes by reacting substituted or unsubstituted 1,2-bis(4-hydroxyphenyl)-halogen substituted aliphatics such as 1,2-bis(4-hydroxyphenyl)-2-chloropropanes in the presence of a base and water.
摘要:
A mixture of water and a glycol, such as ethylene glycol, is employed as the solvent for the reaction between 1,6-dibromo-2-naphthol and an alkali metal sulfite in the preparation of 6-bromo-2-naphthol and its derivatives to effect a substantial reduction in reaction time. The glycol/water mol ratio is ordinarily in the range of 0.1-0.5/l, preferably 0.3-0.5/l.
摘要:
This invention provides a unique method of producing 1,1-bis-(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane ('BPTMC'). The disclosed method manufactures BPTMC from ketals and hemithioketals of 3,3,5-trimethylcyclohexanone ('TMC'). The reaction takes place in the presence of an acid catalyst, and optionally added co-catalysts. Additionally, applicants have disclosed a particularly useful method of manufacturing BPTMC from TMC and alcohol and/or thiol starting materials. These starting materials react to form the TMC ketal or thioketal materials. This method is particularly useful in that it allows recovery and recycling of the alcohol and/or thiol.
摘要:
An improved process for the preparation of vinyl ethers by the coupling reaction of an ester of formula (I), with a carbonyl containing compound of formula (II), wherein A and R are passive organic groups and OY is a hydroxyl group or OP where P is a protecting group is described. The ester and the carbonyl containing compound are reacted in an organic solvent with a titanium salt, a metallic reducing agent and an amine base to provide the vinyl ether. The reaction is safe and produces high yields. The vinyl ethers are useful for producing dioxetanes which produce light upon triggering.
摘要:
L'invention concerne un procédé permettant de monodébromer sélectivement en position 1 le dibromo-1,6 hydroxy-2 naphtaléne. Selon ce procédé, on fait réagir, dans un solvant organique acide et en présence d'un catalyseur à base de carbure de tungstène, (i) ledit dérivé dibromé du naphtaléne avec (ii) de l'hydrogène moléculaire ou un composé susceptible de générer, dans le milieu de réaction, de l'hydrogène naissant. On receuille ainsi principalement du bromo-6 hydroxy-2 naphtalène.
摘要:
The conversion of ortho-hydroxylated Mannich bases to the corresponding methylated compounds, e.g., cresols, can be effectively carried out using a novel hydrogenation technique.