- Synthesis and characterization of new aromatic polyesters derived from new aromatic di- and tri hydroxyl monomers with 4-phenylenediacrylic acid and malonic acid
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In the present work, six new aromatic polyesters (PE1-PE6) have been synthesized in high yields from the polycondensation between di- and tri hydroxyl monomers containing methylene unit, Schiff-base linkages and pyridine heterocyclic ring with 4-phenylenediacrylic acid and malonic acid using dibutyltin dilaurate as catalyst. The structure analysis of the polymers has been carried out by using FT-IR and 1H NMR spectroscopy. The monomers were characterized by FTIR and 1H NMR. FT-IR technique confirmed the esterification of di and tri hydroxyl monomers by the acid in all the polymers.
- Mutar, Mohammed A.
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- Attempted preparation of trisphenol-II
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Condensation of 4,4-bis-(4-methoxyphenyl)-2-methyl-2-pentanol with phenol, in the presence of hydrogen chloride, gives 1,3,3-trimethyl-1-(4-methoxyphenyl)-5-methoxyindan and tris-(4-methoxyphenyl)-ethane instead of expected 2,2,4-tris-(4-methoxyphenyl)-4-methylpentane (trisphenol-II). tris-(4-Hydroxyphenyl)-ethane was obtained, together with bisphenol-A, by condensation of phenol with acetylacetone.
- Nowakowska, Ewa,Daszkiewicz, Zdzislaw,Kyziol, Janusz B.
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- Preparation method 1, 1 and 1 - tri (4 -hydroxyphenyl) ethane
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The invention discloses 1. A preparation method of 1,1 - tris (4 - hydroxyphenyl) ethane is carried out by taking 4 - hydroxyacetophenone and phenol as a raw material and adding a weak basic nitrogen-containing compound as an auxiliary to prepare 1, 1 and 1 - tris (4 - hydroxyphenyl) ethane. To the invention, the conversion rate of 4 - hydroxyacetophenone can be improved by adding a small amount of the nitrogen-containing compound with weak alkalinity during the reaction, and an ideal effect can be achieved even if the amount of phenol is slightly higher than the theoretical demand. .
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Paragraph 0051-0106
(2021/10/02)
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- Method for synthesizing and purifying 1,1,1-tri(4-hydroxy phenyl) ethane
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The invention discloses a method for synthesizing and purifying 1,1,1-tri(4-hydroxy phenyl) ethane, and belongs to the field of chemical synthesis. According to the method, a 1,1,1-tri(4-hydroxy phenyl) ethane (THPE) crude product is synthesized from phenol and p-hydroxyacetophenone by using hydrochloric acid as a catalyst and zinc chloride as a promoter, and is purified to obtain a pure product having a purity higher than 99 percent. The method is an economical and efficient method for producing the 1,1,1-tri(4-hydroxy phenyl) ethane with high reaction yield, and is also an efficient purification method for improving purity.
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Paragraph 0021; 0022; 0023; 0024; 0025
(2016/11/17)
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- POLYCARBONATE RESIN COMPOSITION AND FORMED PRODUCT THEREOF
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In a polycarbonate resin composition containing a polycarbonate resin and a polycarbosilane compound, the use of the polycarbosilane compound modifies the surface properties of the polycarbonate resin composition without adversely affecting the intrinsic characteristics of the polycarbonate resin, such as transparency, heat resistance, and mechanical properties, e.g., impact resistance. A polycarbonate resin composition containing 100 parts by mass of a polycarbonate resin, 0.001 to 1 part by mass of a metal salt compound, and 0.005 to 5 parts by mass of a polycarbosilane compound has significantly improved flame resistance and high transparency and causes markedly reduced outgassing and mold fouling, without losing impact resistance and heat resistance.
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- Cooperativity in multiply H-bonded complexes
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The free energy of complexation of supramolecular complexes containing phenol-carbamate H-bonds is an additive function of the number of H-bonds, with a constant increment of 6 kJ mol-1 per interaction in carbon tetrachloride.
- Hunter, Christopher A.,Ihekwaba, Ndidi,Misuraca, Maria Cristina,Segarra-Maset, Maria Dolores,Turega, Simon M.
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supporting information; experimental part
p. 3964 - 3966
(2010/01/06)
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- Methods for preparing 1,1,1-tris(4-hydroxyphenyl)alkanes
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A method for preparing 1,1,1,-tris(4-hydroxyphenyl)alkanes generally comprises reacting a mixture of an aromatic hydroxy compound and a ketone in the presence of at least one sulfonic acid catalyst and a mercaptan co-catalyst to produce the 1,1,1-tris(4-hydroxyphenyl)alkanes of formula:
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Page/Page column 4-5
(2008/06/13)
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- Methods for preparing 1,1,1-tris(4-hydroxyphenyl)alkanes
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A method for preparing 1,1,1,-tris(4-hydroxyphenyl)alkanes generally comprises reacting a mixture of an aromatic hydroxy compound and a ketone in the presence of at least one ion exchange resin catalyst and optionally a co-catalyst to produce the 1,1,1-tris(4-hydroxyphenyl)alkanes of formula:
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Page/Page column 5
(2008/06/13)
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