Chemical Constituents of Corchorus capsuJaris and C. olitorius (Jute Plant), III. Structure of Corosin

1974 ◽  
Vol 29 (5-6) ◽  
pp. 209-221 ◽  
Author(s):  
M. Manzoor-i-Khuda ◽  
Gerhard Habermehl
Keyword(s):  
Acetic Acid ◽  
Double Bond ◽  
Carbon Atom ◽  
Sulphuric Acid ◽  
Main Product ◽  
Chemical Constituents ◽  
Dioic Acid ◽  
Acetate Ester ◽  
Acid Reagent

Corosin (8; R = R1 = H) has been reisolated through a modified procedure, as its acetate (8; R=H, R1 = Ac), in an overall yield of 0.2% from jute roots. On pyrolysis in vacuo, corosin gave pyro corosin (1a; R1 = OH, R2= COOH, R3 = R5 = H, R4 = R6 = Me), shown to have a 12:18 (17) di-ene formed by elimination of the 19-OH and the angular C-28 carboxyl in the molecule. On rearrangement with concentrated sulphuric acid in acetic acid, corosin acetate gave corosin anhydro lactone acetate (7; R1 = Ac, R = H), having a 13(18) double bond and a lactone bridge between the 28-carboxyl and the 20-carbon atom. Corosin acetate ester (8; R = Me, R 1 = Ac), on treatment with sulphuric-acetic acid reagent, gave as the main product anhydro corosin acetate ester (7; R = Me, R1= A c), with a 12:18(19)-diene. The structure of corosin is proposed to be urs-12-ene-2α, 3β, 19α-trihydroxy-24, 28-dioic acid (8; R = R1= H).

HYDROLYSIS OF CELLULOSE ACETATE SULPHATE IN ACETONE

1954 ◽  
Vol 32 (9) ◽  
pp. 815-822 ◽  
Author(s):  
Karl Keirstead ◽  
John Myers
Keyword(s):  
Acetic Acid ◽  
Cellulose Acetate ◽  
Sulphuric Acid ◽  
Potentiometric Titration ◽  
Titration Method ◽  
Acetate Ester ◽  
Hydrolysis Of Cellulose ◽  
Potentiometric Titration Method ◽  
Hydrolysis Of

When cellulose acetate sulphate is dissolved in acetone the hydrolysis of the sulphate ester is rapid compared with that of the acetate ester. In 70% acetone the relative rates are reversed. Hydrolysis of the sulphate ester in acetone is greatly affected by the temperature. At 25 °C. or greater the hydrolysis is complete after 24 hr. A potentiometric titration method has been developed for the estimation of sulphuric acid in the presence of smaller amounts of acetic acid.

FTIR, GC-MS and HPLC analysis of Baliospermum montanum (Willd.) Muell. Arg.

2020 ◽  
Vol 11 (4) ◽  
pp. 5059-5066
Author(s):  
Sushma B K ◽  
Raveesha H R
Keyword(s):  
Acetic Acid ◽  
Quantitative Estimation ◽  
Chemical Constituents ◽  
Standard Procedure ◽  
Naphthalene Acetic Acid ◽  
Root Extract ◽  
Pentanoic Acid ◽  
Trimethylsilyl Ester ◽  
Isolation And Characterization ◽  
Ms Analysis

The present work is aimed to determine the chemical constituents in Baliospermum montanum methanolic extracts. An in vitro regenerated procedure was developed for the induction of callus from stem explant cultured on Murashige and Skoog (MS) medium fortified with various concentration and permutations of 2, 4-dichloro phenoxy acetic acid, 1-naphthalene acetic acid, 6-benzyl amino purine and gibberellic acid. FTIR & GC-MS analysis was done according to standard procedure. The quantitative estimation of β-sitosterol was done by HPLC method. Maximum fresh and dry weight of callus was estimated in the combination of GA3 (0.5 mg/L) + NAA (2 mg/L) compared to other concentration. The FTIR analysis showed various functional compounds with different characteristic peak values in the extracts. Major bioactive constituents were recognized in the GC-MS analysis. Root extract revealed the existence of 1-hexadecanol, pentanoic acid, 2-(aminooxy)- and 1-hexacosanol. Leaf extract showed the presence of propanoic acid, 2-oxo-, trimethylsilyl ester, 9,12-octadecadienoic acid (z,z)-, trimethylsilyl ester, docosane, 1,22-dibromo- and pentatriacontane. Stem and stem derived callus exhibit the presence of 1,6,3,4-dihydro-2-deoxy-beta-d-lyxo-hexopyranose, n-hexadecanoic acid and pentanoic acid, 2-(aminooxy). The methanolic extract of leaf exhibited 0.2149 % of β-sitosterol content. There were no peaks observed in the root, stem and stem derived callus. Further studies are necessary for the isolation and characterization of bioactive compounds from B. montanum.

Synthesis and properties of 1,3-bis(4-nitrophenyl)-1-butene

1980 ◽  
Vol 45 (7) ◽  
pp. 2120-2124 ◽  
Author(s):  
Gabriel Čík ◽  
Anton Blažej ◽  
Kamil Antoš ◽  
Igor Hrušovský
Keyword(s):  
Acetic Acid ◽  
Nitric Acid ◽  
Double Bond ◽  
Fuming Nitric Acid

1,3-Bis(4-nitrophenyl)-1-butene was prepared by nitration of 1,3-diphenyl-1-butene (I) with fuming nitric acid in acetic acid. The double bond in I was protected by addition of bromine which was eliminated after the nitration. The UV, IR and 1H- spectra of the synthesized compounds are interpreted.

Reaction of 30-nor-18-lupene derivatives with bromine and peracids

1984 ◽  
Vol 49 (1) ◽  
pp. 141-149
Author(s):  
Eva Klinotová ◽  
Jiří Protiva ◽  
Jiří Klinot ◽  
Alois Vystrčil
Keyword(s):  
Acetic Acid ◽  
Double Bond

The reaction of diol I and diacetate IIwith one mole of bromine gives rise, depending on conditions, to isomeric dienes III-V and IX or to derivatives substituted in position 21 (VII, VIII). On reaction of diacetate II with two moles of bromine in acetic acid 21,22-disubstituted compounds XI and XII were obtained. Diene V is the intermediate in the formation of dienes IV and IX and derivatives XI and XII. Epoxidation of the 18(19)-double bond in compounds I and II takes place from the β-side and leads for epoxides XIV and XV.

scholarly journals Kinetics and Mechanism of the Change of the 4-Nitrobenzylthio-System into 4,4′-Diformylazoxybenzene in Alkaline Dioxane-Water Media

1985 ◽  
Vol 40 (11) ◽  
pp. 1128-1132
Author(s):  
Y. Riad ◽  
Adel N. Asaad ◽  
G.-A. S. Gohar ◽  
A. A. Abdallah
Keyword(s):  
Acetic Acid ◽  
Sodium Hydroxide ◽  
Rate Constants ◽  
Main Product ◽  
Reaction Medium ◽  
Aqueous Dioxane ◽  
Proton Abstraction ◽  
First Order ◽  
Water Media ◽  
Different Temperatures

Sodium hydroxide reacts with α -(4-nitrobenzylthio)-acetic acid in aqueous-dioxane media to give 4,4'-diformylazoxybenzene as the main product besides 4,4'-dicarboxyazoxybenzene and a nitrone acid. This reaction was kinetically studied in presence of excess of alkali in different dioxane-water media at different temperatures. It started by a fast reversible a-proton abstraction step followed by two consecutive irreversible first-order steps forming two intermediates (α -hydroxy, 4-nitrosobenzylthio)-acetic acid and 4-nitrosobenzaldehyde. The latter underwent a Cannizzaro's reaction, the products of which changed in the reaction medium into 4,4'-diformylazoxybenzene and 4,4'-dicarboxyazoxybenzene. The rate constants and the thermodynamic parameters of the two consecutive steps were calculated and discussed. A mechanism was put forward for the formation of the nitrone acid.Other six 4-nitrobenzyl, aryl sulphides were qualitatively studied and they gave mainly 4,4'-diformylazoxybenzene beside 4,4'-dicarboxyazoxybenzene or its corresponding azo acid.

Aryl epoxide–halohydrin transformations: stereochemistry of reactions of aryl epoxides with lithium halide–acetic acid reagent

2002 ◽  
Vol 43 (20) ◽  
pp. 3781-3782 ◽  
Author(s):  
Jeanne-Marie Bartas-Yacoubou ◽  
Nkabuije Maduike ◽  
Sampson Kyere ◽  
Lanxuan Doan ◽  
Dale L. Whalen
Keyword(s):  
Acetic Acid ◽  
Acid Reagent

Reaktionen koordinierter Liganden, III [1]. Stabilisierung von Dimenthyldiphosphen und Menthylphosphiniden als Brückenliganden in Metallcarbonylkomplexen / Reaction of Coordinated Ligands, III [1]. Stabilization of Dim enthyldiphosphene and Menthylphosphinidene as Bridging Ligands in Metal Carbonyl Complexes

1986 ◽  
Vol 41 (5) ◽  
pp. 629-639 ◽  
Author(s):  
Anna-Margarete Hinke ◽  
Axel Hinke ◽  
Wilhelm Kuchen ◽  
Wolfgang Hönle
Keyword(s):  
Crystal Structure ◽  
Double Bond ◽  
Complex Formation ◽  
Main Product ◽  
Metal Carbonyl ◽  
Crystal Structure Analysis ◽  
Carbonyl Complexes ◽  
Bridging Ligands ◽  
Metal Carbonyl Complexes ◽  
Chromium Compounds

Abstract Reduction of MentPBr2M(CO)5 1 (M = Cr, W) with magnesium in THF yields the diphos­phene complex (CO)5M(Ment)P=P(Ment)M(CO)5 2 as the main product. In addition, a phosphinidene complex, (CO)5M(Ment)PM(CO)5 (3) is also formed. The latter is obtained in larger amounts, if the reaction is carried out in the presence of M(CO)5THF. The proposed structures are confirmed by NMR and UV data as well as - in the case of the chromium compounds (2a, 3a) - by crystal structure analysis. Compound 2a is obtained only as the frans-isomer. The P-P distance in 2a (204.0 pm) indicates a double bond which does not participate in the complex formation. The P-Cr distance in 3a (average: 230.3 pm) is within the low est range found for this element combination. Reaction of 2a with LiAlH4 yields the diphosphane complex (CO)5CrMent(H)P-P(H)MentCr(CO)5 4 as a mixture of “meso” and “rac” diastereomers.

Partition Column for Determination of Glyceryl Trinitrate in Tablets

1964 ◽  
Vol 47 (3) ◽  
pp. 471-473
Author(s):  
John R Hohmaxn ◽  
Joseph Levine
Keyword(s):  
Acetic Acid ◽  
Glyceryl Trinitrate ◽  
Chromatographic Separation ◽  
Distillation Method ◽  
Sublingual Glyceryl Trinitrate ◽  
Acid Reagent ◽  
Quantitative Results

Abstract A method using column partition chromatographic separation has been developed for the determination of nitroglycerin in soluble, sublingual glyceryl trinitrate tablets. A mixture of the phenoldisulfonic acid reagent and acetic acid is used to extract the nitroglycerin from the eluate. Quantitative results are obtained by measuring the color of the nitrated phenoldisulfonic acid that is formed. Results by the method are in agreement with those obtained by the USP distillation method and an infrared assay.

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