摘要:
Disclosed herein are improved methods for the synthesis of honokiol, as well as methods for the synthesis of 3,3′-di-tert-butyl-5,5′-dimethyl-[1,1′-biphenyl]-2,4′-diol, 3′,5-dimethyl-[1,1′-biphenyl]-2,4′-diol, and 2,4′-dimethoxy-3′,5-dimethyl-1,1′-biphenyl, 3,3′,5,5′-tetra-tert-butyl-[1,1′-biphenyl]-2,4′-diol, and certain tetrasubstituted bisphenols, and uses therefor.
摘要:
Disclosed herein is a process for the preparation of highly pure 2,6-diisopropyl phenol (Formula I), which comprises reacting p-hydroxy benzoic acid (Formula II) with an alkylating agent in presence of aq. mineral acid followed by basification and subsequent washings to yield 4-hydroxy-3,5-diisopropylbenzoic acid (Formula III) free of dimer impurity, 4,4'-oxydibenzoic acid of Formula IV, ether impurity 3,5-di(propan-2-yl)-4-(propan-2-yloxy)benzoic acid of Formula V and the monoalkylated impurity 4-hydroxy-3-(propan-2-yl)benzoic acid of Formula VI; and decarboxylating 4-hydroxy-3,5-diisopropylbenzoic acid (Formula III) in presence of high boiling solvent and sodium hydroxide as a catalyst at high temperature to yield 2,6-diisopropyl phenol substantially free of ether impurity 1,3-di(propan-2-yl)-2-(propan-2-yloxy)benzene of Formula VII and monoalkylated phenol impurity 2-(propan-2-yl) phenol of Formula VIII. Propofol prepared by the process of the present invention is suitable for pharmaceutical use.
摘要:
The composition 3-alkylated-5,5',6,6',7,7',8,8'-octahydro-2,2'-binaphthols and 3,3'-dialkylated- 5,5',6,6',7,7',8,8'-octahydro-2,2'-binaphthols are disclosed, as well as various processes for making them, all involving the alkylation of 5,5',6,6',7,7',8,8'-octahydro-2,2'-binaphthol.
摘要:
An object of the present invention is to provide a process for producing high-purity hydroxytriphenylenes in which not only inexpensive raw materials can be used but also no complicated steps of deprotection such as dealkylation, and reduction and the like are necessary, and which is thereby advantageous in industrial production. Also there is provided a novel crystal of 2,3,6,7,10,11-hexahydroxytriphenylene monohydrate, which has satisfactory thermal stability. The process for producing a compound represented by the general formula (2) is characterized by reacting a compound represented by the general formula (1) in the presence of a metal oxide comprising a metal selected from trivalent iron, pentavalent vanadium and hexavalent molybdenum and of a nonvolatile strong acid:
wherein, Rs are each independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 3 carbon atoms or an alkoxy group having 1 to 3 carbon atoms.
摘要:
The present invention provides a simple and efficient method for producing high-purity 2,3,6,7,10,11-hexahydroxytriphenylene on an industrial scale. The method for producing 2,3,6,7,10,11-hexahydroxytriphenylene comprises reacting catechol with peroxide.
摘要:
A polymeric, phosphorus-containing composition derived from aryl to aryl coupling of a substituted 2,2'-dihydroxyl-1,1'-binaphthalene or a substituted 2,2'-dihydroxyl-1,1'-biphenylene and phosphonylated at the dioxyl of said structure with at least one diaryloxyphosphite [-P(-O-Ar)2], diarylphosphine [-P(Ar)2] and/or aryl,aryloxyphosphinite [-P(Ar)(-O-Ar)], where each Ar is individually phenyl, substituted phenyl, naphthyl, and substituted naphthyl, provided that the two Ar groups that are directly or indirectly bonded to the same phosphorus atom may be linked to each other by a linking unit selected from direct bond, alkylidene, secondary or tertiary amine, oxygen, sulfide, sulfone, and sulfoxide. Polymerization by aryl to aryl coupling is achieved by direct oxidative coupling of the binaphthalene or biphenylene, copolymerization with an aromatic comonomer, or copolymerization with an aldehyde. The phosphonylation may be performed prior to or after polymerization. The polymeric, phosphorus-containing compositions in combination with a Group VIII metal and, optionally a Lewis acid, are particularly useful in the catalytic hydrocyanation of unsaturated organic compounds, isomerization of unsaturated, branched nitriles to unsaturated linear nitriles, and hydroformylation of unsaturated organic compounds.
摘要:
A process for preparing 3,5-bisalkylphenols (2) from carbinol compounds (1); carbinol compounds (1); and a process for preparation of the compounds (1): (1) (2) [wherein R is hydrogen, alkali metal, alkaline earth metal, or a hydroxyl-protecting group(except methyl); R is C1-5 lower alkyl or optionally substituted phenyl; and R and R are each independently lower alkyl, aralkyl, or aryl]. This invention enables efficient and safe preparation of various 3,5-bisalkylphenols including 3,5-diisopropylphenol (which is important as an intermediate in the synthesis of drugs and agricultural chemicals) in shorter steps at high purity in high yield, thus contributing to stable supply of the drugs and agricultural chemicals.
摘要:
The compositions 3-alkylated-5,5',6,6',7,7',8,8'-octahydro-2,2'-binaphthol and 3,3'-dialkylated-5,5',6,6',7,7',8,8'-octahydro-2,2'-binaphthol are disclosed, as well as various processes for making them, all involving the alkylation of 5,5',6,6',7,7',8,8'-octahydro-2,2'-binaphthol.