The present invention provides a plasticizer for a vinyl chloride resin including an ester compound (A1) represented by General Formula (1): ##STR00001##
(in the formula, L's each represent an aliphatic oxycarboxylic acid residue having 3 to 18 carbon atoms or a cyclic ester residue having 3 to 18 carbon atoms, R.sup.1's each represent an alkyl group having 6 to 18 carbon atoms, R.sup.2's each represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, a represents a repeating number of the L, provided that the total of the plural a's is from 1 to 10, and x is an integer of 2 to 4), in order to provide a plasticizer for a vinyl chloride which has excellent compatibility with vinyl chloride resins and with which a vinyl chloride resin composition capable of providing a molded article having excellent freeze resistance and heat resistance can be obtained.

The present invention provides a plasticizer for a vinyl chloride resin including an ester compound (A1) represented by General Formula (1): ##STR00001##
(in the formula, L's each represent an aliphatic oxycarboxylic acid residue having 3 to 18 carbon atoms or a cyclic ester residue having 3 to 18 carbon atoms, R.sup.1's each represent an alkyl group having 6 to 18 carbon atoms, R.sup.2's each represent a hydrogen atom or an alkyl group having 1 to 6 carbon atoms, a represents a repeating number of the L, provided that the total of the plural a's is from 1 to 10, and x is an integer of 2 to 4), in order to provide a plasticizer for a vinyl chloride which has excellent compatibility with vinyl chloride resins and with which a vinyl chloride resin composition capable of providing a molded article having excellent freeze resistance and heat resistance can be obtained.

The disclosure discloses a method for synthesizing 2,3,5,6-tetrafluoro-4-methoxymethyl benzyl alcohol from 1,4-bis(methoxymethyl)-2,3,5,6-tetratluorobenzene, belongings to the technical field of organic synthesis. 1,4-bis(methoxymethyl)-2,3-5,6-tetrafluorobenzene reacts in mixed solution consisting of sulfuric acid aqueous solution and organic carboxylic acid, the obtained mixture is subjected to ester group hydrolysis reaction in the presence of an inorganic base and then to hydroxyl methylation reaction, 2,3,5,6-tetrafluoro-4-methoxymethyl benzyl alcohol is finally obtained via separation and purification, and 1,4-bis(methoxymethyl)-2,3,5,6-tetrafluorobenzene is recovered. The disclosure not only realizes the resource utilization of low-value 1,4-bis(methoxymethyl)-2,3,5,6-tetrafluorobenzene, and meanwhile has the advantages of mild reaction conditions, simple operation, high synthesis yield, good product quality and the like. The disclosure has high social and economic values.

The invention relates to processes for preparing benzoprostacyclin analogues and intermediates prepared from the process, and the benzoprostacyclin analogues prepared therefrom. The invention also relates to cyclopentenone intermediates in racemic or optically active form.

The invention relates to processes for preparing benzoprostacyclin analogues and intermediates prepared from the process, and the benzoprostacyclin analogues prepared therefrom. The invention also relates to cyclopentenone intermediates in racemic or optically active form.

One object of the invention is to provide a method for preparing a 9,9-dialkoxy-7-nonynoate ester and (7E)-7,9-decadienoate ester, which are valuable as intermediates. The method for preparing a (7E)-7,9-decadienoate ester (5) comprises at least steps of: hydrolyzing a 9,9-dialkoxy-7-nonenoate ester (2), R.sup.3O(R.sup.2O)CHCHCH(CH.sub.2).sub.5CO.sub.2R.sup.1, to form a (7E)-9-oxo-7-nonenoate ester (3); and subjecting the (7E)-9-oxo-7-nonenoate ester (3) to a Wittig reaction with a triarylphosphonium methylide (4), Ar.sub.3PCH.sub.2, to form the (7E)-7,9-decadienoate ester (5). The 9,9-dialkoxy-7-nonenoate ester may be prepared by, for example, reducing a 9,9-dialkoxy-7-nonynoate ester (1). ##STR00001##

One object of the invention is to provide a method for preparing a 9,9-dialkoxy-7-nonynoate ester and (7E)-7,9-decadienoate ester, which are valuable as intermediates. The method for preparing a (7E)-7,9-decadienoate ester (5) comprises at least steps of: hydrolyzing a 9,9-dialkoxy-7-nonenoate ester (2), R.sup.3O(R.sup.2O)CHCHCH(CH.sub.2).sub.5CO.sub.2R.sup.1, to form a (7E)-9-oxo-7-nonenoate ester (3); and subjecting the (7E)-9-oxo-7-nonenoate ester (3) to a Wittig reaction with a triarylphosphonium methylide (4), Ar.sub.3PCH.sub.2, to form the (7E)-7,9-decadienoate ester (5). The 9,9-dialkoxy-7-nonenoate ester may be prepared by, for example, reducing a 9,9-dialkoxy-7-nonynoate ester (1). ##STR00001##

The present invention relates to a preparation method of 4-isopropylamino-1-butanol, in which using cheap and readily available tetrahydrofuran and acetic acid solution of hydrogen bromide as starting materials to prepare a novel intermediate of 4-isopropylamino-1-acetoxyl butane and further obtain the target product. The present invention has advantages of convenient process operations, mild reaction conditions, economical and environment-friendly benefits, and suitability for industrial production to obtain the product with high purity and high yield.

The present invention relates to a preparation method of 4-isopropylamino-1-butanol, in which using cheap and readily available tetrahydrofuran and acetic acid solution of hydrogen bromide as starting materials to prepare a novel intermediate of 4-isopropylamino-1-acetoxyl butane and further obtain the target product. The present invention has advantages of convenient process operations, mild reaction conditions, economical and environment-friendly benefits, and suitability for industrial production to obtain the product with high purity and high yield.

The present invention relates to a preparation method of 4-isopropylamino-1-butanol, in which using cheap and readily available tetrahydrofuran and acetic acid solution of hydrogen bromide as starting materials to prepare a novel intermediate of 4-isopropylamino-1-acetoxyl butane and further obtain the target product. The present invention has advantages of convenient process operations, mild reaction conditions, economical and environment-friendly benefits, and suitability for industrial production to obtain the product with high purity and high yield.