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Chemical composition of the essential oils from leaves, flowers, stem and root of centaurea zuvandica sosn. / Sadegh Salmanpour in The journal of essential oil research, Vol. 21 N° 4 (Juillet/Août 2009) 

Public ISBD [article]  in The journal of essential oil research > Vol. 21 N° 4 (Juillet/Août 2009) . - pp. 357-359 Titre : Chemical composition of the essential oils from leaves, flowers, stem and root of centaurea zuvandica sosn. Type de document : texte imprimé Auteurs : Sadegh Salmanpour, Auteur ; Mohammad A. Khalilzadeh, Auteur ; Hasan Sadeghifar, Auteur Article en page(s) : pp. 357-359 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Centaurea  zuvandica  Compositae  Essential  oil  composition  Germacrene  D  α-pinene  α-terpineol  Spathulenol Index. décimale : 646 Résumé : The essential oils obtained from the dried leaves, flowers, stem and root of Centaurea zuvandica Sosn. (Compositae) were analyzed using GC and GC/MS. Twenty components were identified in the oil of leaves with spathulenol (28.1%), α-pinene (21.3%) and caryophyllene oxide (9.7%) as main constituents. Fifteen compounds were identified in the oil of flowers with spathulenol (32.3%), α-pinene (25.8%) and limonene (8.2%) as main components. Eighteen compounds were characterized in the oil of stem with spathulenol (37.1%), α-terpineol (12.8%), caryophyllene oxide (8.2%) as main constituents. In the oil of root, germacrene D (35.2%), spathulenol (15.7%) and α-terpineol (11.6%) were found as main constituents. All oils consisted of monoterpene and sesquiterpene components. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/42#top [article] Chemical composition of the essential oils from leaves, flowers, stem and root of centaurea zuvandica sosn. [texte imprimé] / Sadegh Salmanpour, Auteur ; Mohammad A. Khalilzadeh, Auteur ; Hasan Sadeghifar, Auteur . - pp. 357-359. Génie Chimique Langues : Anglais (eng) in The journal of essential oil research > Vol. 21 N° 4 (Juillet/Août 2009) . - pp. 357-359 Mots-clés : Centaurea  zuvandica  Compositae  Essential  oil  composition  Germacrene  D  α-pinene  α-terpineol  Spathulenol Index. décimale : 646 Résumé : The essential oils obtained from the dried leaves, flowers, stem and root of Centaurea zuvandica Sosn. (Compositae) were analyzed using GC and GC/MS. Twenty components were identified in the oil of leaves with spathulenol (28.1%), α-pinene (21.3%) and caryophyllene oxide (9.7%) as main constituents. Fifteen compounds were identified in the oil of flowers with spathulenol (32.3%), α-pinene (25.8%) and limonene (8.2%) as main components. Eighteen compounds were characterized in the oil of stem with spathulenol (37.1%), α-terpineol (12.8%), caryophyllene oxide (8.2%) as main constituents. In the oil of root, germacrene D (35.2%), spathulenol (15.7%) and α-terpineol (11.6%) were found as main constituents. All oils consisted of monoterpene and sesquiterpene components. DEWEY : 665 ISSN : 1041-2905 En ligne : http://www.jeoronline.com/archive/detail/42#top

Toward thermoplastic lignin polymers. Part 1. / Hasan Sadeghifar in Industrial & engineering chemistry research, Vol. 51 N° 51 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16713–16720 Titre : Toward thermoplastic lignin polymers. Part 1. : Selective masking of phenolic hydroxyl groups in kraft lignins via methylation and oxypropylation chemistries Type de document : texte imprimé Auteurs : Hasan Sadeghifar, Auteur ; Chengzhong Cui, Auteur ; Dimitris S. Argyropoulos, Auteur Année de publication : 2012 Article en page(s) : pp. 16713–16720 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Thermoplastic  Hydroxyl Résumé : This work offers a comprehensive understanding of the conditions required for the selective masking of the phenolic hydroxyl groups in technical kraft lignins, which is pivotal in determining their subsequent chemical and thermal reactivity. To this effect, we have examined the chemistry and developed the conditions for the facile, mild, and selective masking of the phenolic hydroxyl groups in softwood and hardwood kraft lignins. We have compared two series of methylated softwood kraft lignins synthesized using different methylation chemistries. Our data show that (when used as specified) dimethyl sulfate in aqueous NaOH selectively converts the phenolic hydroxyl groups of kraft lignin to its methylated derivatives without apparent side reactions. In contrast, methyl iodide (in the presence of excess K2CO3 in N,N-dimethylformamide) was found to be rather ineffective and unselective. Various milder methylation conditions were also examined for both softwood and hardwood kraft lignins using dimethyl sulfate, and the details of this work are documented. In addition, a series of oxypropylation reactions were also carried out using propylene oxide in aqueous NaOH. Propylene oxide was shown to selectively add (at room temperature, 0.5 M NaOH, 18 h) less than two units on average per phenolic hydroxyl group without significant additional polymerization or other side reactions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301848j [article] Toward thermoplastic lignin polymers. Part 1. : Selective masking of phenolic hydroxyl groups in kraft lignins via methylation and oxypropylation chemistries [texte imprimé] / Hasan Sadeghifar, Auteur ; Chengzhong Cui, Auteur ; Dimitris S. Argyropoulos, Auteur . - 2012 . - pp. 16713–16720. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 51 (Décembre 2012) . - pp. 16713–16720 Mots-clés : Thermoplastic  Hydroxyl Résumé : This work offers a comprehensive understanding of the conditions required for the selective masking of the phenolic hydroxyl groups in technical kraft lignins, which is pivotal in determining their subsequent chemical and thermal reactivity. To this effect, we have examined the chemistry and developed the conditions for the facile, mild, and selective masking of the phenolic hydroxyl groups in softwood and hardwood kraft lignins. We have compared two series of methylated softwood kraft lignins synthesized using different methylation chemistries. Our data show that (when used as specified) dimethyl sulfate in aqueous NaOH selectively converts the phenolic hydroxyl groups of kraft lignin to its methylated derivatives without apparent side reactions. In contrast, methyl iodide (in the presence of excess K2CO3 in N,N-dimethylformamide) was found to be rather ineffective and unselective. Various milder methylation conditions were also examined for both softwood and hardwood kraft lignins using dimethyl sulfate, and the details of this work are documented. In addition, a series of oxypropylation reactions were also carried out using propylene oxide in aqueous NaOH. Propylene oxide was shown to selectively add (at room temperature, 0.5 M NaOH, 18 h) less than two units on average per phenolic hydroxyl group without significant additional polymerization or other side reactions. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301848j