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Acidic imides

Amino-5 -deoxy-2, 3 -0-isopropylideneadenosine was acylated at N-5 with an activated derivative of the 6-carboxy-2-naphthyl ester of Kemp s acid imide. The resulting molecule possesses self-complementary binding sites, the key feature of replicating molecules that act as templates for their own reproduction. The dimer of this molecule is, however, not very stable K = 630 L mol ). When the two initially mentioned educts are added, a small proportion of the ternary complex is also formed and undergoes a fast, template-catalysed... [Pg.347]

Icosanoids (Section 26 6) A group of naturally occurring com pounds derived from unsaturated C20 carboxylic acids Imide (Section 20 16) Compound of the type... [Pg.1286]

WATER-INSOLUBLE NAPHTHALIC ACID IMIDE DYESTUFFS... [Pg.45]

Water-insoluble naphthalic acid imide dyestuffs of the... [Pg.45]

New water-insol. naphthalic acid imide dyestuffs - used to dye blends of polyamide or urethane- and polyester or tri acetate fibres having good light and washing fastness C91-110.342 RICH DE GB LI) ... [Pg.53]

A waler-insol. naphthalic acid imide dyestuff of formula (I) is new ... [Pg.53]

A-Hydroxy-5-norbornene-2,3-dicarboxylic acid imide [21715-90-2] M 179.2, m 165-166", 166-169", pKesi-6 Dissolve in CHCI3, filter, evaporate and recrystallise from EtOAc. IR (nujol) 1695, 1710 and 1770 (C=0), and 3100 (OH) cm. 0-Acetyl derivative has m 113-114° (from EtOH) with IR bands at 1730, 1770 and 1815 cm only, and the 0-benzoyl derivative has m 143-144° (from propan-2-ol or C6H6). [Bauer and Miarka J Org Chem 24 1293 1959 Fujino et al. Chem Pharm Bull Jpn 22 1857 1974],... [Pg.264]

The reaction of ethylene carbonate with acid imides which yields V-hydroxyethyl derivatives w as applied to 6-azauracil. In agreement with the foregoing findings, 6-azauracil produced a 3-(2-hydroxyethyl) derivative (65) which w as treated with thionyl chloride to convert... [Pg.212]

Heterocycles with olefinic C=C double bonds are able to add diazornetliane to form pyrazolines, for example, maleic acid imide, ... [Pg.280]

N 22.45%, OB to C02 -106.85%, ndis, mp 136—38 (decompn). Sparingly sol in cold w. Prepd by nitration of alpha, alpha -iminodipropionic acid imide with anhydr nitric acid... [Pg.290]

Maleic acid imides (maleimides) are derivatives of the reaction of maleic anhydride and ammonia or primary amine compounds. The double bond of a maleimide may undergo an alkylation reaction with a sulfhydryl group to form a stable thioether bond (Chapter 2, Section 2.2). Maleic anhydride may presumably undergo the same reaction with cysteine residues and other sulfhydryl compounds. [Pg.107]

The primary starting material for the synthesis of perylene tetracarboxylic acid pigments is the dianhydride 71. It is prepared by fusing 1,8-naphthalene dicar-boxylic acid imide (naphthalic acid imide 69) with caustic alkali, for instance in sodium hydroxide/potassium hydroxide/sodium acetate at 190 to 220°C, followed by air oxidation of the molten reaction mixture or of the aqueous hydrolysate. The reaction initially affords the bisimide (peryldiimide) 70, which is subsequently hydrolyzed with concentrated sulfuric acid at 220°C to form the dianhydride ... [Pg.474]

Naphthalic acid imide 69 is obtained through air oxidation of acenaphthene 72 with vanadium peroxide as a catalyst. The intermediate, naphthalic anhydride 73, is subsequently reacted with ammonia ... [Pg.474]

A different route proceeds by alkali fusion of the corrspondingly substituted naphthalic acid imide. This pathway parallels the synthesis of perylene tetracarboxylic acid diimide 70 (Sec. 3.4.1.1). The method is particularly suited to aliphatic amines. [Pg.475]

Piroxicam Piroxicam, 1,1 -dioxid-4-hydroxy-2-methyl-iV-2-pyradyl-2//-1,2-benzothiazine-3-carboxamide (3.2.78), is synthesized from saccharin (3.2.70). Two methods for saccharin synthesis are described. It usually comes from toluene, which is sulfonated by chlorosulfonic acid, forming isomeric 4- and 2-toluenesulfonyl chlorides. The isomeric products are separated by freezing (chilling). The liquid part, 2-toluenesulfonyl chloride (3.2.68) is separated from the crystallized 4-toluenesulfochloride and reacted with ammonia, giving 2-toluenesul-fonylamide (3.2.69). Oxidation of the product with sodium permanganate or chromium (VI) oxide in sulfuric acid gives saccharin—o-sulfobenzoic acid imide (3.2.70) [123-126]. [Pg.51]

Natural (—)-actinidine (9a) is prepared from nepetalinic acid imide (262) via dichloropyridine (263) 403) and from iridodial (264) via bis (2,4-dinitrophe-nyl)hydrazone 404) or treatment with ferric ammonium sulfate (Scheme 19) 405). (+)-Actinidine (9b), the enantiomer of natural alkaloid, is synthesized from acid chloride 265, derived from (+)-pulegone, via vinylketone 267 (Scheme 20) 406). Racemic actinidine (9) is prepared by intramolecular cycloaddition of an acetylene across a pyrimidine ring in 5-(hept-5-yn-2-yl)-4,6-dihydroxypyrimidine (268) followed by chlorination and hydrogenation (Scheme 21) 407). [Pg.250]

For carbon nucleophiles sequential addition of 2-potassio-2-nitropropane and oxygen to 4-arylidene-2-phenyl-5(47/)-oxazolones 623 has been reported (Scheme 7.200). The process involves a Michael reaction of the 2-nitropropane anion followed by reaction with molecular oxygen and elimination of nitrous acid to yield 2-aryl butenoic acid imides 626. [Pg.259]

Analysis of Amines, Hydroxylamines, Amino Acids and Peptides via 0,0-Dibenzoyltartaric Acid Imides... [Pg.273]

Table 11. 1 H-NMR Analysis of Amines. Amino Acids, Esters, Peptides and Hydroxylamines via (/ ./ )-0,0 -Dibenzoyltartaric Acid Imides (5, CDC13)50... Table 11. 1 H-NMR Analysis of Amines. Amino Acids, Esters, Peptides and Hydroxylamines via (/ ./ )-0,0 -Dibenzoyltartaric Acid Imides (5, CDC13)50...
The first report of the preparation of the dialkyl succinimide (29-3) dates back to early in the twentieth cenmry. It is consequently surprising to note that it was introduced as an anticonvulsant, under the name ethosuximide, well after its more recently synthesized congeners. The synthetic route starting from methyl ethyl ketone generally follows that above with the exception of the use of ammonia in the last step. The compound thus differs as well by possessing a somewhat acidic imide proton [30]. [Pg.257]

Alkylation of the hydantoin (89-2) from benzaldehyde with ethyl iodide takes place at the imide nitrogen to afford ethitoin (89-3) [93]. In much the same vein, treatment of the hydantoin (89-5) from propiophenone with methyl iodide (89-5) in the presence of a base affords mephenytoin (89-6) [94]. Replacement of the quite acidic imide proton by an aUcyl group is not required for activity the well-known anticonvulsant phenytoin (89-8) consists of simply the hydantoin obtained from benzophenone (89-7) [95] this is often formulated as its sodium salt. [Pg.292]

With a-hydrazinocarboxylates (613) instead of hydrazonocarboxylic acids, imidates give the dihydro-1,2,4-triazin-5-ones (614) (1895CB1223,64LA(676)l2l). [Pg.441]

Aminohydrazines (640) are useful intermediates for the synthesis of reduced 1,2,4-triazines. With nitriles, carboxylic acids, imidates, thioimidates or orthocarboxylates, they form l,4,5,6-tetrahydro-l,2,4-triazines (641) (78HC(33)189, p. 629), with carbon disulfide they give the 3-thiones (642) <78HC(33)189, p.648), and with aldehydes or ketones hexahydro-1,2,4-triazines (643) are formed <78HC(33)189, p. 657). [Pg.443]

Imidic acid (40) is the lactim tautomer of an acid amide (39 lactam form). Although no substantiated claim has been put forward for the isolation of free imidic acids, imidates (41) (also... [Pg.276]


See other pages where Acidic imides is mentioned: [Pg.501]    [Pg.502]    [Pg.89]    [Pg.281]    [Pg.381]    [Pg.127]    [Pg.127]    [Pg.1623]    [Pg.38]    [Pg.160]    [Pg.183]    [Pg.107]    [Pg.184]    [Pg.462]    [Pg.604]    [Pg.21]    [Pg.241]    [Pg.241]    [Pg.135]    [Pg.139]    [Pg.2045]    [Pg.2045]    [Pg.2045]   
See also in sourсe #XX -- [ Pg.103 ]




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A-Ketocarboxylic acid imides

Acid Amides, Lactams, and Imides

Acid Anhydrides to Imides

Acid strength imides

Acidity constants imides

Acids to Imides

Acyl imidates carboxylic acid amides

Addition acid imides

Amines dicarboxylic acid imides

Amines, Acid Amides, Imides and Nitriles

Amino acids from imides

Carboxylic acid imides

Carboxylic acid imides hydrogenolysis

Carboxylic acid imides methyl esters

Carboxylic acid imides peptides

Carboxylic acids to imides

Decarbonylation dicarboxylic acid imide

Dicarboxylic acid esters imides

Dicarboxylic acid imides

Dicarboxylic acid imides N-sulfonyloxydicarboxylic

Dicarboxylic acid imides amides

Dicarboxylic acid imides anhydrides

Dicarboxylic acid imides imines, cyclic

Dicarboxylic acid imides monoamides

Hydrogenation dicarboxylic acid imide

Hydroxamic acids acid imides)

Imidazole imidic acid

Imide Formation from Substituted Dicarboxylic Acid Residues

Imide succinic acid

Imides acidity

Imides acidity

Imides s. Dicarboxylic acid

Imides, acid/base hydrolysis

Imidic acid tautomer

Imidic acids

Imidic acids from carboxamides

Imidic acids trimerization

Imidic acids, esters

Imines dicarboxylic acid imide

Lactams dicarboxylic acid imides

Maleic acid imides,

Maleic acid imides, reaction with

N-Acoxydicarboxylic acid imides

N-Acoxydicarboxylic acid imides, polymeric

N-Aminodicarboxylic acid imides

N-Halogenimides acid imides

N-Halogenodicarboxylic acid imides

N-Hydroxydicarboxylic acid imides

N-Sulfonyloxy dicarboxylic acid imides

N-Sulfonyloxydicarboxylic acid imides

N-Thiodicarboxylic acid imide

O-Dicarboxylic acid imides

O-Dicarboxylic acid imides s. Phthalimides

O-Sulfobenzoic acid imide

Phosphorous acid amide imide

Polyamic acid chemical imidization

Ring contraction acid imides

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