Lipolytic synthesis of optically active 1,2-dibutyryl-sn-glycerol. Identification of diglyceride by solvent-dependent specific rotation

1998 ◽  
Vol 75 (8) ◽  
pp. 1061-1062 ◽  
Author(s):  
Charmian J. O’Connor ◽  
Douglas T. Lai ◽  
Richard H. Barton
Keyword(s):  
Specific Rotation ◽  
Optically Active

scholarly journals Microwave-assisted synthesis and characterization of some optically active poly(ester-imide) thermoplastic elastomers

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Saeed Zahmatkesh ◽  
Abdol Reza Hajipour
Keyword(s):  
Thermal Analyses ◽  
Specific Rotation ◽  
Thermoplastic Elastomers ◽  
Optically Active ◽  
Microwave Assisted Synthesis ◽  
H Nmr ◽  
Microwave Assisted ◽  
Diacid Chloride ◽  
Elemental Analyses

AbstractPyromellitic dianhydride (1) was reacted with L-leucine (2) to result in [N,N'-(pyromellitoyl)-bis-L-leucine diacid] (3). This compound (3) was converted to N,N'-(pyromellitoyl)-bis-L-leucine diacid chloride (4) by reaction with thionyl chloride. The microwave-assisted polycondensation of this diacid chloride (4) with polyethyleneglycol-diol (PEG-200) and/or three synthetic bisphenols furnish a series of new PEIs and Co-PEIs in a laboratory microwave oven (Milestone). The resulting polymers and copolymers have inherent viscosities in the range of 0.31- 0.53 dl g-1. These polymers are optically active, thermally stable and soluble in polar aprotic solvents such as DMF, DMSO, NMP, DMAc and sulfuric acid. All of the above polymers were fully characterized by IR spectroscopy, 1H NMR spectroscopy, elemental analyses, specific rotation and thermal analyses. Some structural characterizations and physical properties of these optically active PEIs and Co-PEIs are reported.

PHYSICAL CONSTANTS AND ESTIMATION OF STEREOISOMERIC 2,3-BUTANEDIOLS

1951 ◽  
Vol 29 (10) ◽  
pp. 885-894 ◽  
Author(s):  
R. W. Watson ◽  
J. A. R. Coope ◽  
J. L. Barnwell
Keyword(s):  
Refractive Index ◽  
Pilot Plant ◽  
Experimental Error ◽  
Specific Rotation ◽  
Optically Active ◽  
Temperature Relation ◽  
Aerobacter Aerogenes ◽  
Physical Constants ◽  
Beet Molasses

The refractive index – temperature relation for optically active and racemic diols is linear, with [Formula: see text] from 25° to 40°C.: for the meso-isomer [Formula: see text] from 25° to 50°C. The specific rotation [Formula: see text]. Measurements of [Formula: see text] and [Formula: see text] in suitably purified mixtures of stereoisomers allow calculation of the percentage of each isomer present. Tests of the method on known mixtures of all three stereoisomers show an experimental error of ±3%. Analyses of five diol samples from pilot plant fermentations of beet molasses by Aerobacter aerogenes reveal 65–87% meso-, from 2 to 16% dextro-, and from 0 to 33% racemic 2,3-butanediol.

SYNTHESIS OF DIPALMITOYL-L-α-GLYCEROPHOSPHORIC ACID DERIVATIVES, AS POSSIBLE INTERMEDIATES FOR SYNTHESIS OF GLYCERYLPHOSPHATIDES

1960 ◽  
Vol 38 (1) ◽  
pp. 297-300 ◽  
Author(s):  
N. Z. Stanacev ◽  
M. Kates
Keyword(s):  
Melting Point ◽  
Phosphatidic Acid ◽  
Good Yield ◽  
Dimethyl Ester ◽  
Specific Rotation ◽  
Optically Active ◽  
Phosphatidic Acids ◽  
Alternate Synthesis

Using Verkade's method for the preparation of DL-α-phosphatidic acids, optically active dipalmitoyl-L-α-phosphatidic acid and its derivatives were prepared in good yield. The free dipalmitoyl-L-α-phosphatidic acid and its dimethyl ester were identical in melting point and specific rotation with the same compounds originally prepared by Baer using an alternate synthesis.

scholarly journals Synthesis and Characterization of New Optically Active Poly (ethyl L-lysinamide)s and Poly (ethyl L-lysinimide)s

2010 ◽  
Vol 2010 ◽  
pp. 1-6 ◽  
Author(s):  
Saeed Zahmatkesh ◽  
Mohammad Reza Vakili
Keyword(s):  
Nmr Spectroscopy ◽  
Elemental Analysis ◽  
Specific Rotation ◽  
Viscosity Measurement ◽  
Optically Active ◽  
Inherent Viscosity ◽  
Synthesis And Characterization

Ethyl L-lysine dihydrochloride was reacted with three different dianhydrides to yield the poly (ethyl L-lysinimide)s ( NMR spectroscopy, elemental analysis, WAX diffraction, TGA, inherent viscosity measurement, and specific rotation.

Microbial conversion of optically active (R) 3 Chloro-1,2-propandiol by Clavispora lusitaniae MGR5 KY209902

2021 ◽  
Vol 16 (7) ◽  
pp. 23-29
Author(s):  
Kumarasamy Suresh ◽  
Selvaraj Vasuki ◽  
Narayanan Mathiyazhagan ◽  
Ranganathan Muthusamy
Keyword(s):  
Ir Spectrum ◽  
Functional Group ◽  
Dynamic Properties ◽  
Synthetic Medium ◽  
Broad Band ◽  
Specific Rotation ◽  
Optically Active ◽  
Microbial Conversion ◽  
Ph Change ◽  
Clavispora Lusitaniae

The MCH assimilation Clavispora lusitaniae MGR5 (KY209902) was isolated from sugarcane juice using a screening medium. The preliminary assimilation was exercised with Clavispora lusitaniae MGR5 grown on synthetic medium and assimilation by pH change of the medium was observed. The specific rotation of R-3- Chloro-1,2-propanediol was -6 (c=2.5, in C2H5OH) in conditions with enatiomeric excess of 92.8 % Clavispora lusitaniae MGR5 product. The sharp peaks in HPLC spectrum of R 3 Chloro-1,2-propanediol in the retention time peak was of 2.38 min and concentration 100%. The structural and dynamic properties of R-3-Chloro-1,2-propanediol in GCMS spectrum were obtained. The IR spectrum, a shallow broad band at wavelength 3309.8 signifies the presence of O-H stretching, the narrow peak at 1087.85 indicates the presence of C=O stretching in conjugation with functional group of R- 3 Chloro-1,2-propanediol(C3H7ClO2). These results concluded that the strain assimilated with stereo inversion of R-3- Chloro-1,2-propanediol via RS 3- chloro-1,2-propanediol. The possibility to produce optically active R-3- Chloro-1,2-propanediol was discussed.

Optically active polymer: synthesis and characterization of new optically active poly (hydrazide-imide)s incorporating L- leucine

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Abdol Reza Hajipour ◽  
Saeed Zahmatkesh ◽  
Arnold E. Ruoho
Keyword(s):  
Thermo Gravimetric Analysis ◽  
Specific Rotation ◽  
Optically Active ◽  
Gravimetric Analysis ◽  
Optically Active Polymer ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Good Thermal Stability ◽  
H Nmr

AbstractThis paper deals with the polycondensation between a chiral diacyl chloride (N,N′-Pyromelliticdiimido-di-L-leucine chloride) and six different dihydrazides. The corresponding poly (hydrazide-imide)s which have been obtained in quantitative yields are moderately soluble in polar aprotic solvents, have good thermal stability and optical activity. The synthetic compounds have been characterized by IR, UV and 1H NMR spectroscopy, elemental analysis and specific rotation. The thermal properties of the polymers (10 and 15) have been studied by thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC).

SYNTHESIS OF DIPALMITOYL-L-α-GLYCEROPHOSPHORIC ACID DERIVATIVES, AS POSSIBLE INTERMEDIATES FOR SYNTHESIS OF GLYCERYLPHOSPHATIDES

1960 ◽  
Vol 38 (3) ◽  
pp. 297-300 ◽  
Author(s):  
N. Z. Stanacev ◽  
M. Kates
Keyword(s):  
Melting Point ◽  
Phosphatidic Acid ◽  
Good Yield ◽  
Dimethyl Ester ◽  
Specific Rotation ◽  
Optically Active ◽  
Phosphatidic Acids ◽  
Alternate Synthesis

Using Verkade's method for the preparation of DL-α-phosphatidic acids, optically active dipalmitoyl-L-α-phosphatidic acid and its derivatives were prepared in good yield. The free dipalmitoyl-L-α-phosphatidic acid and its dimethyl ester were identical in melting point and specific rotation with the same compounds originally prepared by Baer using an alternate synthesis.

Interfacial synthesis and characterization of L-lysinederived optically active poly(hydrazide-imide)s

e-Polymers ◽  
2012 ◽  
Vol 12 (1) ◽  
Author(s):  
Saeed Zahmatkesh ◽  
Alireza Banaei ◽  
Ashkbous Yazdanpanah
Keyword(s):  
Specific Rotation ◽  
Viscosity Measurement ◽  
Optically Active ◽  
Synthesis And Characterization ◽  
Aprotic Solvents ◽  
Glass Transition Temperatures ◽  
H Nmr ◽  
Interfacial Synthesis ◽  
Ft Ir

AbstractSix novel poly(hydrazide-imide)s (PHIa-f) were prepared from the reaction of a novel L-lysine-derived chiral diacid, ethyl L-lysine-N,N'-ditrimellitoyl diacide (1), with six synthetic dihydrazides by interfacial polycondensation. These polymers have inherent viscosities in the range of 0.23 to 0.42 dl g-1, display optical activity, and are readily soluble in polar aprotic solvents. They start to decompose (T10%) above 248 ºC and display glass-transition temperatures at 164.37-210.20 0C All of the above polymers were fully characterized by UV, FT-IR and 1H NMR spectroscopy, elemental analysis, TGA, DSC, inherent viscosity measurement and specific rotation.

Radical Polymerizations of Optically Active Methacrylamides Having Oxazoline Moieties

2014 ◽  
Vol 955-959 ◽  
pp. 732-735
Author(s):  
Chao Yuan ◽  
Ying Bo Tao ◽  
Xiao Xiao Li ◽  
Xiao Meng Liu
Keyword(s):  
Radical Polymerization ◽  
Specific Rotation ◽  
Optically Active ◽  
Molecular Weights ◽  
Radical Polymerizations

A novel type of chiral N-substituted methacrylamide derivatives bearing an oxazoline pendant (OPMAM) had been synthesized. Radical polymerization were carried out to produced corresponding polymers with high specific rotation in moderate yields. The polymerization characteristics and the chiroptical behavior of the resultant polymers have been examined in detail by using HPLC and CD and UV-vis spectra. The polymers showed relatively high molecular weights(Mn=5000-15000). The abolutely value of the specific rotation of poly(OPMAM)s basically increased with increasing the molecular weights.

Preparation and characterization of new thermally stable and optically active polyesters by direct polycondensation reaction promoted by Vilsmeier adduct

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Shadpour Mallakpour ◽  
Farhang Tirgir
Keyword(s):  
Thermal Stability ◽  
Analysis Data ◽  
Specific Rotation ◽  
Optically Active ◽  
Thermally Stable ◽  
Scanning Calorimetry ◽  
Good Thermal Stability ◽  
Molecular Weights ◽  
Tosyl Chloride ◽  
Benzoyl Group

AbstractHighly soluble and optically active aromatic polyesters (PE)s containing phthalimide and flexible chiral groups were prepared with moderate molecular weights by step-growth polymerization of diacid monomer containing pendant 4- [(2L)-phthalimidylpropanoylamino)benzoyl group with several aromatic diols, in a system of tosyl chloride, pyridine (Py) and N,N-dimethylformamide (DMF) to give a series of new optically active PEs with good yield and moderate inherent viscosity ranging from 0.28 to 0.48 dL/g. The aim of this work was to obtain novel optically active PEs that was more soluble in common organic solvents while maintaining the high thermal stability. All polymers derived from such a diacid and aromatic diols were highly organosoluble in solvents like N-methyl-2-pyrrolidinone, N,Ndimethylacetamide, DMF, Py, dimethyl sulfoxide. Thermogravimetric analysis data showed that these PEs are thermally stable, with 10% weight loss being recorded above 400 °C and showed good thermal stability associated with high glasstransition temperatures above 200 °C as measured by differential scanning calorimetry. All of the above polymers were characterized by FT-IR and specific rotation techniques and some of them were also characterized by 1H-NMR and elemental analyses methods.

Sign in / Sign up

Export Citation Format

Share Document