Optical resolution HPLC column packings carrying penicillin sulfoxide nucleus. Part IV. Effect of substituents in the benzyl ester group on the optical resolution efficiency

1989 ◽  
Vol 28 (9-10) ◽  
pp. 513-515 ◽  
Author(s):  
Y. Saotome ◽  
T. Miyazawa ◽  
T. Endo
Keyword(s):  
Optical Resolution ◽  
Ester Group ◽  
Benzyl Ester ◽  
Effect Of Substituents ◽  
Hplc Column ◽  
Penicillin Sulfoxide ◽  
Column Packings

scholarly journals MODIFICATION OF OLIGOESTER MALEINATE BY ALKYL ESTER OF N-MALEINIMIDOBENZOIC ACID

2019 ◽  
Vol 62 (12) ◽  
pp. 78-84
Author(s):  
Vladimir A. Danilov ◽  
Oleg A. Kolyamshin ◽  
Nadezhda E. Temnikova ◽  
Oleg V. Stoyanov ◽  
Marina V. Kolpakova
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Unsaturated Polyester ◽  
Ester Group ◽  
Thermomechanical Properties ◽  
Hydrocarbon Radical ◽  
Butyl Ether ◽  
Effect Of Substituents ◽  
Aromatic Group

When using products from unsaturated polyester resins (NPS), often increased requirements for thermal and chemical resistance are raised. Increasing the thermal stability of the PS is possible due to the modification of resins by polymerization compounds, which can copolymerize with both oligoether maleinate and styrene. One of such effective additives is N-phenylmaleinimides. The paper presents the results of modification of unsaturated polyester grade PN-1 UT with alkyl ethers n-maleinimidobenzoic acid. The properties of terpolymers are investigated. The effect of substituents of the aromatic group with N-phenylmaleinimides on the properties of terpolymers was investigated. It is also of interest to study the effect of substituents of the aromatic group in N-phenylmaleinimide on the properties of modified polymers. It is shown that terpolymers due to their maleinimides are superior in strength and thermomechanical properties of the copolymers of oligoestermaleinate and styrene. The increase in the size of the hydrocarbon radical substituents of the aromatic group of maleinimides contributes to the increase of the thermo-and physico-mechanical properties of terpolymers. It is also shown that the glass transition temperature of polymers depends on the content of maleinimides, as well as on the structure of the aromatic group. With an increase in the content of maleinimides (up to 5 wt. %) there is an increase in the glass transition temperature and the beginning of the destructive flow. The greatest increase in glass transition temperature (30 °C) is observed at a content of 3 wt. % butyl ether of n-maleimidobenzoic acid. The increase in the length of the hydrocarbon radical (С5Н11 and С8Н17) of the ester group of n-maleimidobenzoic acid leads to the appearance of a plasticizing effect. Synthesized terpolymers can be recommended as binders in the production of heat-resistant composite materials, in particular, fiberglass.

The asymmetric Michael-type alkylation of chiral β-enamino esters: critical role of a benzyl ester group in the racemization of adducts

2005 ◽  
Vol 16 (23) ◽  
pp. 3853-3857 ◽  
Author(s):  
Mathieu Pizzonero ◽  
Frédéric Hendra ◽  
Sandrine Delarue-Cochin ◽  
Marie-Elise Tran Huu-Dau ◽  
Françoise Dumas ◽  
...  
Keyword(s):  
Critical Role ◽  
Ester Group ◽  
Benzyl Ester

The Effect of Substituents on the Pyridine Ring in the Diastereoselective Cyclopropanation Reaction of Pyridinium Ylides Bearing an 8-Phenylmenthyl Ester Group.

ChemInform ◽  
2006 ◽  
Vol 37 (29) ◽  
Author(s):  
Satoshi Kojima ◽  
Kouji Fujitomo ◽  
Yoshiaki Itoh ◽  
Kyoko Hiroike ◽  
Masaaki Murakami ◽  
...  
Keyword(s):  
Pyridine Ring ◽  
Ester Group ◽  
Effect Of Substituents ◽  
Pyridinium Ylides

The Effect of Substituents on the Pyridine Ring in the Diastereoselective Cyclopropa- nation Reaction of Pyridinium Ylides Bear- ing an 8-Phenylmenthyl Ester Group

Heterocycles ◽  
2006 ◽  
Vol 67 (2) ◽  
pp. 679 ◽  
Author(s):  
Satoshi Kojima ◽  
Kouji Fujitomo ◽  
Yoshiaki Itoh ◽  
Kyoko Hiroike ◽  
Masaaki Murakami ◽  
...  
Keyword(s):  
Pyridine Ring ◽  
Ester Group ◽  
Effect Of Substituents ◽  
Pyridinium Ylides
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