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Carbodiimids

Optically active thiazoline-5-ones (203) can be obtained when cycliza-tion of an optically active N-thiobenzoyl amino acid is brought about by the use of dicyclohexyl carbodiimide in pure chloroform, dich-loromethane (455), or tetrahydrofuran (453. 456) (Scheme 104). [Pg.427]

The selenoureas needed for condensation can usually be prepared by addition of hydrogen selenide to a solution of the corresponding cyanamides or carbodiimides. They can be less dangerously and quite... [Pg.225]

Carbodiimides (cyanamides) —N=C=N— 2140-2125 (s) 2150-2100 (vs) 1460 1150-1140 (vs) Asymmetric stretching of aliphatics Asymmetric stretching of aromatics two bands Symmetrical stretching of aliphatics Symmetric stretching of aryls... [Pg.766]

Bisa2iridine compounds and A/-(2-chloroethyl)carbodiimides have also been prepared using isocyanide dichlorides and ethyleneimine (178,179). The iodide-cataly2ed rearrangement of the formerly mentioned compounds provides a method for preparing the tetrahydroimida2oimida2ole system ... [Pg.7]

The available free carboxyl groups of the DAS—HMS can be linked via a peptide bond to available primary amine groups onto highly antigenic carriers using a carbodiimide (19). The carriers used in this case were bovine semm albumin (BSA) and poly-L-lysine (molecular weight 150,000 to 300,000). The... [Pg.24]

Carbodiimide formation is markedly accelerated when phosphine oxides (R PO) or phosphates are used as catalysts. Intermediates with P—NR bonds have been postulated as iatermediates ia these reactioas (59,60). [Pg.451]

Some of these isocyanates are commercially available in derivatized form, such as biurets and carbodiimides, to provide materials having improved handling or processing characteristics. [Pg.454]

Garbodiimide Formation. Carbodiimide formation has commercial significance in the manufacture of Hquid MDI. Heating of MDI in the presence of catalytic amounts of phosphine oxides or alkyl phosphates leads to partial conversion of isocyanate into carbodiimide (95). The carbodiimide (39) species reacts with excess isocyanate to form a 2 + 2cycloaddition product. The presence of this product in MDI leads to a melting point depression and thus a mixture which is Hquid at room temperature. [Pg.456]

Also, the presence of strong bases, even in trace amounts, can promote the formation of isocyanurates or carbodiimides. In the event of gross contamination, the exothermic reaction can sharply increase the temperature of the material. Normally, the trimerization reaction occurs first and furnishes heat for the carbodiimide reaction. The carbodiimide reaction Hberates carbon dioxide and forms a hard soHd. The Hberation of carbon dioxide in a sealed vessel could result in overpressurization and mpture. [Pg.457]

Other six-membered rings with two heteroatoms are also obtained from reaction of diketene with imidates, cyanamides, carbodiimides, isocyanates, oxa2olines, or other multiftmctional compounds. [Pg.478]

Anhydride Formation. The carboxyl group ia A/-protected amino acids is converted iato the symmetrical anhydride on treatment with the carbodiimide (84). [Pg.281]

Other Reactions. 2-Dioxolaniniines, 2-oxathiolaniniines, and 2-oxa2o1idinimines result from the reaction of propylene oxide with isocyanates, isothiocyanates, and carbodiimides, respectively (103,104). [Pg.135]

An intramolecular Diels-Alder cyclization produces excellent yields of 2-aminoquinoline-3-carboxylate esters (57). Equally fine yields of the requited carbodiimides have been reported, making this an attractive route to an unusual substitution type. [Pg.392]

By a suitable choice of activating reagents, primary and secondary alcohols can be selectively oxidi2ed to carbonyl compounds in good yields at room temperatures. Typical activating reagents are acetic anhydride, sulfur trioxide—pyridine, dicyclohexyl carbodiimide, and phosphoms pentoxide (40). [Pg.108]

Modification of cellular polymers by incorporating amide, imide, oxa2ohdinone, or carbodiimide groups has been attempted but only the urethane-modified isocyanurate foams are produced in the 1990s. PUIR foams often do not require added fire retardants to meet most regulatory requirements (34). A typical PUIR foam formulation is shown in Table 6. [Pg.350]

Ionic polymers are also formulated from TDI and MDI (43). Poly(urethane urea) and polyurea ionomers are obtained from divalent metal salts of /)-aminohen2oic acid, MPA, dialkylene glycol, and 2,4-TDI (44). In the case of polyureas, the glycol extender is omitted. If TDI is used in coatings apphcations, it is usually converted to a derivative to lower the vapor pressure. A typical TDI prepolymer is the adduct of TDI with trimethyl olpropane (Desmodur L). Carbodiimide-modified MDI offers advantages in polyester-based systems because of improved hydrolytic stabihty (45). Moisture cure systems based on aromatic isocyanates are also available. [Pg.350]

Gyanamides and Derivatives A/-Chloro-/-alkylcyanamides, RN(C1)CN, are oils that have medicinal and other appHcations (99). Primary and secondary alkyl-A/-chlorocyanamides add photochemically to olefins yielding 1 1 adducts. By contrast, A/-chloro-A/-/-butylcyanamide initially rearranges photochemically to A/-chloro-Af-/-butylcarbodiimide, (CH2)3CN=C=NC1, prior to addition to olefins giving carbodiimides (67,100). [Pg.455]

Olefin isomerization can be catalyzed by a number of catalysts such as molybdenum hexacarbonyl [13939-06-5] Mo(CO)g. This compound has also been found to catalyze the photopolymerization of vinyl monomers, the cyclization of olefins, the epoxidation of alkenes and peroxo species, the conversion of isocyanates to carbodiimides, etc. Rhodium carbonylhydrotris(triphenylphosphine) [17185-29-4] RhH(CO)(P(CgH )2)3, is a multifunctional catalyst which accelerates the isomerization and hydroformylation of alkenes. [Pg.172]

Dime thy laminopropy I )-3-ethylcarbodiimide hydrochloride [l-ethyl-3-(3-dimethyl-aminopropyl) carbodiimide hydrochloride] see entry on p. 212 in Chapter 4. [Pg.531]

One inherent weakness of Vulkollan-type materials is their susceptibility to hydrolysis. Life in a humid environment may, however, be doubled by the incorporation of 2 pphr (parts per hundred resin) of a carbodiimide. [Pg.787]


See other pages where Carbodiimids is mentioned: [Pg.80]    [Pg.119]    [Pg.224]    [Pg.543]    [Pg.801]    [Pg.161]    [Pg.8]    [Pg.448]    [Pg.453]    [Pg.251]    [Pg.344]    [Pg.344]    [Pg.80]    [Pg.36]    [Pg.44]    [Pg.20]    [Pg.37]    [Pg.60]    [Pg.265]    [Pg.266]    [Pg.74]    [Pg.13]    [Pg.487]    [Pg.487]    [Pg.798]   
See also in sourсe #XX -- [ Pg.419 ]




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1 -Cyclohexyl-3- carbodiimide,

1 -Ethyl-3 - [3 -dimethylaminopropyl carbodiimide

1- Cyclohexyl-3- carbodiimide hydrochloride

1.1- Enediamines from carbodiimides

1.2.4- Triazole - from carbodiimides

2-Alkoxy-5 -oxazolones carbodiimides

5 - carbodiimides in synthesis

5 -Oxazolones carbodiimides

Acids, esterification using carbodiimide

Acrylic acid Carbodiimides

Activation by carbodiimides

Acylation water-soluble carbodiimide

Addition of Halides to Cyanamides and Carbodiimides

Alcohols carbodiimides

Aliphatic carbodiimides

Alkyl carbodiimides

Alkyl carbodiimides 2+2] cycloaddition reactions

Amides carbodiimide hydrochloride

Amines carbodiimides

Amines with carbodiimides

Amines, reactions with carbodiimides

Amino acids carbodiimide hydrochloride

Ammonia, reactions with carbodiimides

Antigen modifications by carbodiimide methods

Applications of Carbodiimides

Aromatic carbodiimides

Aromatic carbodiimides stability

Aryl carbodiimides

Aryl carbodiimides 2+2] cycloaddition reactions

Asymmetric synthesis carbodiimide

Barbituric acids carbodiimides

Bis-carbodiimides

By Halogenation of Carbodiimides

CARBODIIMIDE POLYSTYRENE

CARBODIIMIDE, POLYMERIC

CARBODIIMIDE, POLYMERIC DERIV

Calcium carbodiimide

Carbodiimid

Carbodiimid

Carbodiimide

Carbodiimide

Carbodiimide Coupling to PE Lipid Derivatives

Carbodiimide Coupling to Phosphatidylethanolamine Lipid Derivatives

Carbodiimide Reaction with 5 Phosphate of DNA (Phosphoramidate Formation)

Carbodiimide activation

Carbodiimide chemistry

Carbodiimide chromatography

Carbodiimide complexes

Carbodiimide couphng

Carbodiimide coupling

Carbodiimide coupling carboxylate-modified

Carbodiimide coupling procedure

Carbodiimide coupling reagent

Carbodiimide derivatives

Carbodiimide foams

Carbodiimide formation

Carbodiimide from isocyanates

Carbodiimide from thioureas

Carbodiimide from ureas

Carbodiimide hapten coupling procedure

Carbodiimide intermediates

Carbodiimide ligands

Carbodiimide modification

Carbodiimide moieties

Carbodiimide peptide synthesis

Carbodiimide principle

Carbodiimide reaction mechanism

Carbodiimide reagent

Carbodiimide side reaction

Carbodiimide synthesis

Carbodiimide technique

Carbodiimide, 1 - -3-ethylPfitzner-Moffatt oxidation

Carbodiimide, comparison with

Carbodiimide, dicyclohexyl-

Carbodiimide, dicyclohexyl-, oxidation

Carbodiimide, dicyclohexylactivator alcohol oxidation, DMSO

Carbodiimide, diphenyl

Carbodiimide, ethyl-, hydrochloride

Carbodiimide, polystyrene-bound

Carbodiimide, surface attachment

Carbodiimide-Mediated Reactions of A-Acylamino Acids and Peptides

Carbodiimide-Mediated Reactions of A-Alkoxycarbonylamino Acids

Carbodiimide-activated acids

Carbodiimide-mediated reactions with

Carbodiimide-mediated reactions with conjugates

Carbodiimide-promoted coupling

Carbodiimides

Carbodiimides -ones

Carbodiimides 1-oxides

Carbodiimides 1.3- oxazetidines

Carbodiimides 1.3- thiazetidines

Carbodiimides 2-imino

Carbodiimides 3-Carbolines

Carbodiimides Diethylamino)sulfur trifluoride

Carbodiimides Other carbohydrates

Carbodiimides Silver trifluoromethanesulfonate

Carbodiimides acid anhydride synthesis

Carbodiimides acid chlorides

Carbodiimides addition

Carbodiimides amidine synthesis

Carbodiimides amidoximes

Carbodiimides applications

Carbodiimides as Stabilizers

Carbodiimides as reagents

Carbodiimides azides

Carbodiimides biotin-hydrazide

Carbodiimides carbodiimidium salts

Carbodiimides carboxylic acid amides

Carbodiimides catalysts

Carbodiimides chemistry

Carbodiimides chlorides

Carbodiimides chloro- from

Carbodiimides compounds

Carbodiimides compounds using

Carbodiimides coupling reagents

Carbodiimides cycloaddition reactions

Carbodiimides cycloaddition reactions with

Carbodiimides cycloadducts derived from

Carbodiimides cystamine

Carbodiimides dicyclohexyl-carbodiimide

Carbodiimides dicyclohexylcarbodiimide

Carbodiimides diisopropylcarbodiimide

Carbodiimides dimerization

Carbodiimides formamidines

Carbodiimides formation

Carbodiimides from isocyanates

Carbodiimides guanidines

Carbodiimides hydrosilylation

Carbodiimides insertion

Carbodiimides insertion reactions

Carbodiimides isocyanate salts

Carbodiimides isocyanates

Carbodiimides isoureas

Carbodiimides ketenes

Carbodiimides l-ethyl-3-[

Carbodiimides lipid derivatives

Carbodiimides liposome conjugation

Carbodiimides metal alkoxides

Carbodiimides nucleotides

Carbodiimides peptide synthesis

Carbodiimides peptide synthesis with

Carbodiimides phenylcarbonyl isocyanate

Carbodiimides phosphate groups

Carbodiimides polypeptides

Carbodiimides preparation

Carbodiimides reacting with carboxylic acids

Carbodiimides reaction with, phosgene

Carbodiimides reactions with

Carbodiimides reactivity

Carbodiimides reagents

Carbodiimides review

Carbodiimides special

Carbodiimides startg

Carbodiimides structure

Carbodiimides sulfoxide

Carbodiimides thioureas

Carbodiimides toxicity

Carbodiimides types

Carbodiimides unsym

Carbodiimides ureas

Carbodiimides, RNCNR

Carbodiimides, by dehydration

Carbodiimides, diaryl-, reaction with

Carbodiimides, hemiacetal activation

Carbodiimides, hydration

Carbodiimides, hydrophosphination

Carbodiimides. synthesis

Carboxylates carbodiimides

Carboxylic acids carbodiimides

Carboxylic reaction with carbodiimides

Catalysis carbodiimides

Catalyst carbodiimidation

Catalysts carbodiimide

Chemistry and Technology of Carbodiimides Henri Ulrich

Chemistry and Technology of Carbodiimides Henri Ulrich 2007 John Wiley Sons, Ltd, ISBN

Conversion of Carbamates into Urethanes, Isocyanates, Ureas, and Carbodiimides

Coupling reactions using carbodiimides

Covalent carbodiimide coupling

Cross-Linking with Carbodiimides

Cumulated double bonds carbodiimides

Cyclic carbodiimide isomers

Cyclic carbodiimides

Cyclic carbodiimides cycloaddition

Cyclic carbodiimides nucleophilic

Cyclic carbodiimides reactions

Cyclic carbodiimides synthesis

Cyclization agents/cyclizations carbodiimides

Cyclization carbodiimide mediated

Cycloaddition of carbodiimides

Cycloadducts carbodiimides

DCCD, dicyclohexyl carbodiimide

DMSO activators carbodiimide

Dialkyl carbodiimide

Diazetidines carbodiimides

Dicyclohexyl carbodiimide [DCC

Dicyclohexyl carbodiimide cyclization with

Dicyclohexyl carbodiimide cyclodehydration

Dicyclohexyl carbodiimide reaction

Dicyclohexyl carbodiimide, chemical

Dicyclohexyl carbodiimide, synthesis

Diisopropyl carbodiimide

EDCI, 1 -ethyl-3- carbodiimide

ETHYLDIMETHYLAMINOPROPYL CARBODIIMIDE

Enyne carbodiimides

Esterification carbodiimide mediated

Esters carbodiimide hydrochloride

Ether-urethane carbodiimide

Ethyl-3- carbodiimide

Ethyl-3-(3-dimethylaminopropyl) carbodiimide Hydrochloride

Ferrocenyl carbodiimides

Fluorous carbodiimide

From Other Carbodiimides

Glycosyl carbodiimides

Guanidines from carbodiimides

Guanidines reaction with carbodiimides

Halogenated carbodiimides

Halogenated carbodiimides reactions

Hapten-carrier conjugation carbodiimide mediated

Heterocumulenes carbodiimides

Heterocycles from carbodiimides

Hydantoins carbodiimides

Hydrazide coupling using carbodiimides

Hydrazides coupling using carbodiimides

Immobilization carbodiimide activation

Isocyanates catalytic conversion into carbodiimides

L-Cyclohexyl-3- carbodiimide

L-Ethyl-3- carbodiimide hydrochloride

Library carbodiimides

Macrocyclic carbodiimides

Mercury carbodiimide

Metal Substituted Carbodiimides

Method carbodiimide

Monosubstituted carbodiimides

Mukaiyama reagent, carbodiimides

Nitrogen substituted carbodiimides

Nitrogen substituted carbodiimides reactions

Notes on Carbodiimides and Their Use

Oligomeric carbodiimide stabilizers

Oligomeric carbodiimides

Oligomeric carbodiimides polymers

Oligonucleotide carbodiimides

Oligonucleotides using carbodiimides

On the Role of 1-Hydroxybenzotriazole as an Epimerization Suppressant in Carbodiimide-Mediated Reactions

PS-carbodiimide

Peptide bond formation with carbodiimide

Peptide bonds using carbodiimides

Peptide synthesis, using carbodiimides

Peptides carbodiimide hydrochloride

Peptides coupling, 1 -ethyl-3- carbodiimide

Phosphate groups reaction with carbodiimides

Phosphates reaction with carbodiimides

Phosphorous Substituted Carbodiimides

Phosphorus substituted carbodiimides

Polyamine carbodiimides

Polymer-bound carbodiimides

Polymeric Carbodiimide. I. Preparation

Polymeric carbodiimides

Polymers Carbodiimide

Polymers Derived from Unsaturated Carbodiimides

Polymers containing carbodiimide groups

Preparation of Activated Esters Using Carbodiimides and Associated Secondary Reactions

Properties carbodiimides

Proteins carbodiimide hydrochloride

Protocol carbodiimide conjugation

Rare earth metal complexes carbodiimide addition

Reaction carbodiimides

Reaction of Ylides with Carbodiimides

Reactions of Halogenated Carbodiimides

Reactions of Metal Substituted Carbodiimides

Reactions of Nitrogen Substituted Carbodiimides

Reactions of Phosphorous Substituted Carbodiimides

Reactions of Sulfur Substituted Carbodiimides

Reactive carbodiimide linkage

Resin-bound carbodiimides

Rhodium 72-carbodiimide complex

Silicon substituted carbodiimides

Stabilizers, carbodiimides

Sugar carbodiimides

Sulfur substituted carbodiimides

Symmetrical carbodiimides

Synthesis of Metal Carbodiimide Adducts

Synthesis of Metal Substituted Carbodiimides

Synthesis of Nitrogen Substituted Carbodiimides

Tautomerism carbodiimides

Unsaturated Carbodiimides

Unsymmetrical carbodiimides

Uronic acids carbodiimide reduction

Use of Carbodiimides In Condensation Reactions

Vinyl carbodiimides

Water-soluble carbodiimide

Water-soluble carbodiimide concentration

Water-soluble carbodiimide cross-linking

Water-soluble carbodiimides

With cyclic carbodiimides

Ylides, reactions with carbodiimides

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