23358-95-4

Usage

Uses

Bis(4-hydroxybutyl) Terephthalate is an intermediate formed in the synthesis of Cyclotris(1,4-butylene Terephthalate) (C988975), a cyclic trimer of poly(butylene terephthalate), a thermoplastic engineering polymer.

Upstream product

• 110-63-4 Butane-1,4-diol 
• 100-20-9 terephthaloyl chloride 
• 24968-12-5 bis(4-benzyloxybutyl) terephthalate 
• 623-27-8 terephthalaldehyde, 
• 100-21-0 terephthalic acid 

Downstream Products

• 24968-12-5 C₄₆H₄₂O₁₂ 
• 63440-94-8 butylene terephthalate cyclic trimer 
• 24968-12-5 bis(4-(4-allylterephthaloyloxy)butyl) terephthalate 

Relevant academic research and scientific papers

Preparation method and separation method of low polymerization cyclic polymer

The invention provides a preparation method of a low polymerization cyclic polymer, and the method comprises the following steps: (1-1) in an organic solvent A, terephthaloyl chloride and 1,4-butanediol undergo esterification reaction under the action of

PROCESS FOR THE PRODUCTION OF BIS-HYDROXYALKYLENE DICARBOXYLATES

The present invention relates to a process for the production of bis-hydroxyalkylene dicarboxylates comprising the steps in this order of: (a) providing to a reaction vessel a reaction mixture comprising a dicarboxylic acid or a diester thereof and an alk

A practical synthesis of the cyclic butylene terephthalate trimer

This paper described a practical synthetic approach for the cyclic butylene terephthalate trimer (7). The key step was a ring-closing metathesis, using Grubbs' second-generation catalyst to form the macrocyclic ring. The advantages of this procedure included short reaction steps, simple operations and good yields.

Preparation method of cyclic tetrapolybutylene terephthalate

The invention discloses a preparation method of cyclic tetrapolybutylene terephthalate. The method comprises the steps as follows: a) an initial material, namely, terephthaloyl dichloride, reacts with1,4-butanediol under the action of an alkaline reagent, and terephthalic bis(4-hydroxyl-butyl)ester, namely, a compound I, is obtained; b) the compound I reacts with monobenzyl terephthalate under the action of a condensing agent, and bis(4-(4-benzyloxy terephthaloyl)butyl)terephthalate, namely, a compound II, is obtained; c) the compound II is dissolved in a proper solvent, a catalyst is added to reduce debenzylation under the action of palladium-carbon and hydrogen, and 4,4'-[terephthaloyl bis(oxytetramethylene oxycarbonyl)]dibenzoic acid, namely a compound III, is obtained; d) the compoundIII reacts with the compound I under the action of a condensing agent, and the target product, namely, cyclic tetrapolybutylene terephthalate, is obtained. The method is low in cost, short in synthesis route, convenient to operate, high in product quality and good in industrial application value.

Polybutylene terephthalate cyclic trimerization preparation of (by machine translation)

The invention specifically has described a kind of new cyclic trimeric butylene terephthalate (Cyclic PBT Dimer) method for preparing, in the terephthalic chloride and 1, the 4 the protecting [...] butanediol as raw material with oriented synthesis strategy of deprotection of the polybutylene terephthalate cyclic trimerization, in the plastics can be used for the PBT polybutylene terephthalate cyclic trimerization contrast analysis of the impurity with the detection. Said product of this invention the chemical structural formula is: (by machine translation)

Chemoselective dehydrogenative esterification of aldehydes and alcohols with a dimeric rhodium(II) catalyst

Dehydrogenative cross-coupling of aldehydes with alcohols as well as dehydrogentive cross-coupling of primary alcohols to produce esters have been developed using a Rh-terpyridine catalyst. The catalyst demonstrates broad substrate scope and good functional group tolerance, affording esters highly selectively. The high chemoselectivity of the catalyst stems from its preference for dehydrogenation of benzylic alcohols over aliphatic ones. Preliminary mechanistic studies suggest that the active catalyst is a dimeric Rh(ii) species, operating via a mechanism involving metal-base-metal cooperativity.

IMPROVEMENTS IN OR RELATING TO PLASTICISER ESTERS

Terephthalic acid di-alkyl esters in which the alkyl groups of the ester are obtained from branched C5 to C13 alcohols or mixtures of mixtures of C5 to C13 linear and branched alcohols in which less than 50 mole % of the alcohols are linear alcohols and the branched chain alkyl groups of such alcohols contain methyl groups and have an average of more than 7 carbon atoms and are free of ethyl groups. The di-esters are particularly useful as plasticizers and particularly plasticizers for polyvinyl chloride.

Methods for removing catalyst residue from a depolymerization process stream

The invention relates to methods and systems for selective removal of catalyst residue from a depolymerization product stream without a water quench, as well as methods and systems for subsequent recovery of residual linear oligomer. The substantially metal-free and substantially water-free residual oligomer byproduct can then be advantageously used as recyclate in a process for preparing MPO. For example, the residual oligomer recyclate can be used as a reactant in the polymerization and subsequent depolymerization (cyclization) of low-acid polyester to form MPO.