Endo norbornene 5 6 dicarboxylic anhydride

Cargoes together with container sales service available. The contents of the tube solidified and were dissolved in acetone and precipitated in carbon tetrachloride.

Synthesis of Cis-Norbornene-5, 6-Endo-Dicarboxylic Anhydride

Store in a cool, dry place. The process of claim 2 where said adduct is the endo isomer. The crystals were isolated through filtration in a Hirsch funnel. A peak at cm-1 represented the carbon-oxygen functional group. The infrared spectra of the maleic anhydridenorbornene-2, 3-dicarboxylic anhydride copolymers, prepared by copolymerization of maleic anhydride with either of the isomers of the cyclic adduct, recorded as films cast on sodium chloride plates from acetone solution, show absorption peaks at and cm-1, characteristic of copolymers containing maleic anhydride.

Vacuum or sweep up material and place into a suitable disposal container. Avenoza and Kawamura reported asymmetric Diels-Alder reaction of cyclopentadiene and chiral dienophile [11,12].

The minimum reaction temperature employed in the preparation of the novel copolymers of the present invention is the temperature at which endo-exo isomerization occurs. The copolymers of the present invention differ from the acyclic conjugated diene-maleic anhydride copolymers as well as the furan-maleic anhydride copolymers of the prior art in that they are essentially fully saturated and in that they cannot be prepared by the disclosed processes unless the reaction temperature is that at which endo-exo isomerization of the adduct occurs.

The alkene carbons, C-2 and C-3, exhibited a peak at Either atmospheric or superatmospheric pressures may be employed.

Methyl-5-norbornene-2,3-dicarboxylic anhydride

The Diels- Alder reaction is one of the most important types of reactions in organic chemistry Weldegirma, It is one substance or mixture during the medicine making period, it can not be taken directly by patients.

We obtained crystals that were a small and more powdery than plate-like. These and other objects of the present invention will become apparent from the ensuing description and illustrative embodiments. Cosmetics with a wide range of raw materials, different performance.

What is claimed is: The NMR spectrum of the copolymer in acetone-d6 at room temperature showed absorption in the 5. The novel polymers of this invention may be converted into numerous derivatives by any of the known reactions for organic compounds containing anhydride groups. A peak at cm-1 accounted for the carbonyl functional group, while a peak at cm-1 accounted for the alkene bond.

The calculations for the percent yield are as follows: Print Choose Type of service. The molecular weight of the copolymer, determined cryoscopically in dioxane, was This reaction is so important because of its ability to form new carbon-carbon bonds.

Avoid contact with skin and eyes. Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids.

IR & 1H-NMR Spectra for the Diels-Alder Experiment

Exo-isomer of norbornene carboxylic ester shows higher reactivity in living ROMP than endo-isomer [7]. The absence of a peak at 4. A further object of the present invention is to provide a process for preparing such novel copolymers.

The reaction may be carried out in bulk, i. The absence of absorption peaks at and cm-1 indicates the absence of double bonds.

norbornene-5,6-dicarboxylic acid

In order to un- dimerize dicyclopentadiene, it must be heated to just under its boiling point to make fresh cyclopentadiene.

Although the homopolymer endonorbornene-2,3-dicarboxylic anhydride, prepared by polymerization in the presence of a free radical catalyst at a temperature where endo-exo isomerization does not occur, is soluble in dioxane, the homopolymer of the exo adduct, prepared under the same conditions, is insoluble in dioxane.

The novel copolymers of this invention may be converted into numerous derivatives by any of the known reactions for organic compounds containing anhydride groups. In order to distinguish between the two possible isomers, properties such as melting point and spectroscopy data were analyzed.

Another object of the present invention is to provide novel copolymers of the maleic anhydride-cyclic conjugated diene adducts.

Zeitschrift für Kristallographie - Crystalline Materials

When either isomer is heated at a sufficiently elevated temperature, isomerization occurs and mixture of both isomers is obtained. The absorption peak at 6. As a result, low exo-ratio was observed since nonselective hydrolysis occurred due to high concentration of water.

The benzene-soluble fraction was washed with an aqueous sodium bicarbonate solution and the benzene-insoluble fraction was extracted with an aqueous sodium hydroxide solution. In addition, it exhibited two peaks at 3. This reaction is so important because of its ability to form new carbon-carbon bonds.

cis-5-Norbornene-endo-2,3-dicarboxylic anhydride

Through the Diels-Alder reaction, % yield of cis-Norbornene-5,6-endo-dicarboxylic anhydride was produced. The distinction of the presence of the endo isomer was proven by analyzing physical properties of both possible isomers.

Infrared Spectra of Reactants and Product of the Diels-Alder Reaction of Cyclopentadiene with Maleic Anhydride to form Endo-Norbornene-cis-5,6-Carboxylic Anhydride. Preparation of cis-Norbornene-5,6-endo-dicarboxylic Anhydride. Synonym: cis-endoNorbornene-2,3-dicarboxylic anhydride, cis-endo-Bicyclo[] heptene-2,3-dicarboxylic anhydride CAS Number Empirical Formula (Hill Notation) C 9 H 8 O 3.

concluded that the substance 5-norbornene-2,3-dicarboxylic anhydride is not of a safety concern for the consumer if it is used as a co-monomer in polyester. X-ray diffraction data for endo-norbornene-cis-5,6-dicarboxylic anhydride and endo-norbornene-cis-5,6-dicarboxylic acid Crystallographic data for three mixed bidentate and tridentate complexes of.

Synthesis of N-hexyl-exo-norbornene-5,6-dicarboximide (exoHexNb)1 exo HexNb was synthesized using the same procedure followed for the synthesis of endo HexNb using cis norbornene- exo -2,3-dicarboxylic anhydride as a starting material.

Endo norbornene 5 6 dicarboxylic anhydride
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