Abstract:
Insecticides containing as active agent an insecticidally effective amount of a compound represented by the following general formula I
wherein R is hydrogen or t-butyl, with the proviso that the hydroxyl group is in the ortho position with respect to R and at least one t-butyl group is present in the ortho position with respect to the hydroxyl group, are provided. They are effective in combatting larval forms of mosquitoes.
Abstract:
Alkenylphenol and its polymer were prepd. by the decomposition of dihydroxydiphenyl alkane(I) on inert org. base catalyst-contg. reaction carrier such as oxide or carbonate of alkali metal of alkali earth metal; alkali metal salt of phenol or bisphenol A, weak acid or alip. acid; and by heating to 150-250≦̸C under reduced pressure(10-100mmHg). The concentration of I in reaction carrier was maintained
Abstract:
Isopropenyl phenol is produced by the thermal decomposition of its oligomers. Process comprises continuously feeding the oligomers into an inert organic reaction medium; heating to 150-250≦̸C at 10-100 mm Hg at a rate such that the concn. of oligomers is not more than 30 wt.% and continuously distilling off the prod. and recovering it. The medium is a high boiling organic solvent of melting or softening point not more than 150≦̸C and a lower vapour pressure than the prod. at the oligomer decomposition temp. Prods. have reduced contents of impurities.
Abstract:
A novel process for producing alkenyl phenols, which comprises continuously feeding a dihydroxydiphenyl alkane such as 2,2-(4,4'-dihydroxydiphenyl)propane, 2,2-(4,4'-dihydroxy-3,3'-dimethyldiphenyl)propane, 2,2-(4,4'-dihydroxydiphenyl)butane, 2,2-(4,4'-dihydroxydiphenyl)-4-methylpentane, 1,1,1-(4,4'-dihydroxytriphenyl)ethane and 1,1-(4,4'-dihydroxydiphenyl)cyclohexane into a high-boiling inert organic reaction medium such as an alkylnaphthalene containing a basic catalyst and heated at 150 DEG to 250 DEG C. under 10 to 100 mmHg while maintaining the concentration of the dihydroxydiphenyl alkane in the reaction medium at not more than 30% by weight, thereby cleaving it in the reaction medium; and continuously distilling off the cleavage product out of the reaction system and recovering it. This process can afford the corresponding highly pure alkenyl phenol as a monomer and/or its polymer almost quantitatively.
Abstract:
A novel process for producing alkenyl phenols, which comprises continuously feeding a dihydroxydiphenyl alkane such as 2,2-(4,4'-dihydroxydiphenyl)propane, 2,2-(4,4'-dihydroxy-3,3'-dimethyldiphenyl)propane, 2,2-(4,4'-dihydroxydiphenyl)butane, 2,2-(4,4'-dihydroxydiphenyl)-4-methylpentane, 1,1,1-(4,4'-dihydroxytriphenyl)ethane and 1,1-(4,4'-dihydroxydiphenyl)cyclohexane into a high-boiling inert organic reaction medium such as an alkylnaphthalene containing a basic catalyst and heated at 150 DEG to 250 DEG C. under 10 to 100 mmHg while maintaining the concentration of the dihydroxydiphenyl alkane in the reaction medium at not more than 30% by weight, thereby cleaving it in the reaction medium; and continuously distilling off the cleavage product out of the reaction system and recovering it. This process can afford the corresponding highly pure alkenyl phenol as a monomer and/or its polymer almost quantitatively.
Abstract:
A novel process for producing alkenyl phenols, which comprises continuously feeding a dihydroxydiphenyl alkane such as 2,2-(4,4'-dihydroxydiphenyl)propane, 2,2-(4,4'-dihydroxy-3,3'-dimethyldiphenyl)propane, 2,2-(4,4'-dihydroxydiphenyl)butane, 2,2-(4,4'-dihydroxydiphenyl)-4-methylpentane, 1,1,1-(4,4'-dihydroxytriphenyl)ethane and 1,1-(4,4'-dihydroxydiphenyl)cyclohexane into a high-boiling inert organic reaction medium such as an alkylnaphthalene containing a basic catalyst and heated at 150 DEG to 250 DEG C. under 10 to 100 mmHg while maintaining the concentration of the dihydroxydiphenyl alkane in the reaction medium at not more than 30% by weight, thereby cleaving it in the reaction medium; and continuously distilling off the cleavage product out of the reaction system and recovering it. This process can afford the corresponding highly pure alkenyl phenol as a monomer and/or its polymer almost quantitatively.
Abstract:
A drying oil such as isomerised linseed oil, dehydrated castor oil or the like oil which has an iodine value of more than 140 and a content of conjugated double bonds of less than 50% is reacted with isopropenylphenyl and/or oligomers thereof, preferably in an amount, by weight of 0.1 - 2 times as great as that of the drying oil in the presence of a small amount Or an acid at a tmeperature of 65 - 150.degree.C for 0.5 - 3 hours. By the reaction, isopropenylphenol and/or its oligomers are introduced to the drying oil while the double bonds of the oil are retained. The thus introduced oil is further reacted with a phenol or phenols under strongly acidic conditions to introduce the phenols thereto. The drying oil which has been introduced with the isopropenylphenol and/or its oligomers and also with the phenols is mixed with a phenol or phenols and then reacted with formaldehyde to give a modified phenolic rosin. This phenolic resin is useful for making a phenolic laminate with improved flexibility punching quality and water resistance.
Abstract:
A new resol-type phenol resin is described which is obtained by heat-reacting isopropenylphenol or an oligmer thereof or mixtures thereof as partial or whole phenol component of the resin with an aldehyde in the presence of a basic catalyst. Varnishes are obtained by adding a suitable vehicle to the resin. Laminates manufactured by impregnating a base with the phenol resin and heating the impregnated base to cure the resin are obtained with superior mechanical and electrical characteristics.
Abstract:
A novel trimer of p-isopropenyl phenol of the structure which is useful as a material or a curing agent for epoxy resins. The linear trimer includes a cis-isomer (m.p. 225.5 - 227.degree.C) and a trans-isomer (m.p. 167 - 168.degree.C). It is prepared by reacting p-isopropenyl phenol or its linear polymer in the presence of an acid catalyst such as sulfuric acid, boron fluoride or activated clay in an aromatic hydrocarbon, halogenated hydrocarbon, substituted aromatic hydrocarbon or aprotic polar solvent (e.g., benzene, carbon tetrachloride, nitrobenzene or dioxane).