Wholly aromatic polyesters derived from 6-hydroxy-5-phenyl-2-naphthoic acid and 4'-hydroxy-3′ -phenylbiphenyl-4-carboxylic acid

1995 ◽  
Vol 96 (1) ◽  
pp. 125-134 ◽  
Author(s):  
Jung-Il Jin ◽  
Seung-Moo Huh
Keyword(s):  
Carboxylic Acid ◽  
Naphthoic Acid ◽  
Aromatic Polyesters

Pulse polarographic study of the behaviour of some o,o'-dihydroxyazo-compounds

1989 ◽  
Vol 54 (5) ◽  
pp. 1219-1226 ◽  
Author(s):  
Enric Casassas ◽  
Miquel Esteban ◽  
Santiago Alier
Keyword(s):  
Carboxylic Acid ◽  
Reaction Mechanisms ◽  
Sulphonic Acid ◽  
Base Catalysis ◽  
Polarographic Study ◽  
Acid Base ◽  
Eriochrome Black T ◽  
Naphthoic Acid ◽  
Calcon Carboxylic Acid

The reduction of several o,o'-dihydroxyazo-compounds is studied by means of pulse polarographic techniques (DPP, NPP and RPP). The compounds studied are the following: 2-(2'-hydroxyphenylazo)-phenol (o,o'-dihydroxyazobenzene), 1-(2'-hydroxy-1'-naphthylazo)-2-naphthol-4-sulphonic acid (calcon or Eriochrome Blue Black R), 1-(2'-hydroxy-4'-sulpho-1'-naphthylazo)-2-hydroxy-3-naphthoic acid (calcon carboxylic acid), and 1-(1'-hydroxy-2'-naphthylazo)-6-nitro-2-naphthol-4-sulphonic acid (Eriochrome Black T). Correlations between Ip and Epand experimental variables (pH, T, conc.) and instrumental parameters (dropping time, t, and pulse magnitude, ΔE) are established. Reaction mechanisms formerly proposed are discussed on the basis of the new obtained results, and the ranges are defined where adsorption and/or acid-base catalysis are operative.

Exhaustive C-methylation of carboxylic acids by trimethylaluminium: A new route to t-butyl compounds

1974 ◽  
Vol 27 (8) ◽  
pp. 1665 ◽  
Author(s):  
A Meisters ◽  
T Mole
Keyword(s):  
Carboxylic Acid ◽  
Benzoic Acid ◽  
Carboxylic Acids ◽  
Cinnamic Acid ◽  
Benzoic Acids ◽  
Naphthoic Acid ◽  
Triphenylacetic Acid

Carboxylic acids are exhaustively C-methylated to t-butyl compounds by excess trimethylaluminium at c. 120�. Benzoic acid for example, gives t-butylbenzene. Similarly methylated are o-fluoro-, o-bromo-, and m-chloro-benzoic acids, 5-chloro-3-phenylsalicylic acid, 1-naphthoic acid, palmitic, oleic and undec-10-enoic acids. Adamantane-1-carboxylic acid gives mostly l-isopropenyladaman- tane, along with some 1-t-butyladamantane. Cinnamic acid gives mainly the allylically rearranged 2-methyl-4-phenylpent-2-ene. Triphenylacetic acid behaves atypically; 1,1,1-triphenylpropan-2-one and 3,3,3-triphenylpropyne result.

THE SYNTHESIS OF POSSIBLE DEGRADATION PRODUCTS OF METATHEBAINONE. I.

1944 ◽  
Vol 22b (3) ◽  
pp. 56-65 ◽  
Author(s):  
H. L. Holmes ◽  
L. W. Trevoy
Keyword(s):  
Carboxylic Acid ◽  
Ethyl Ester ◽  
Degradation Products ◽  
Aldehyde Group ◽  
Carboxyl Group ◽  
Unsuccessful Attempt ◽  
Naphthoic Acid ◽  
Relationship Of ◽  
The Relationship ◽  
General Method

The method of Crowley and Robinson (5) for the synthesis of 6-methoxy-3,4-dihydro-2-naphthoic acid has been modified to provide an improved and general method for the synthesis of 3,4-dihydro-2-naphthoic acids. The 7-methoxy-3,4-dihydro-2-naphthoic acid and its ethyl ester have been shown to react with butadiene and 2,3-dimethylbutadiene to give 3-methoxy-5,8,9,10,13,14-hexahydrophenanthrene-14-carboxylic acid and its 6,7-dimethyl derivative. The relationship of these hydrophenanthrenes to possible degradation products of morphine and metathebainone has been discussed. An unsuccessful attempt was made to lengthen the C14-chain by converting the carboxyl group to an aldehyde group by the Rosenmund method followed by condensation with malonic acid. The projected conversion failed in the first stage.

125. 1 : 9-Benzanthrone-8-carboxylic acid and dibenzanthronedicarboxylic acid from 8-bromo-1-naphthoic acid

1935 ◽  
pp. 571 ◽  
Author(s):  
H. Gordon Rule ◽  
William Pursell ◽  
A. John G. Barnett
Keyword(s):  
Carboxylic Acid ◽  
Naphthoic Acid

A Pyrolytic Approach to 2-Hydroxy-7-methoxy-5-methyl-1-naphthoic Acid

1995 ◽  
Vol 48 (5) ◽  
pp. 1055 ◽  
Author(s):  
RFC Brown ◽  
FW Eastwood ◽  
JM Horvath
Keyword(s):  
Carboxylic Acid ◽  
Condensation Product ◽  
Quantitative Yield ◽  
Meldrum's Acid ◽  
Meldrum’S Acid ◽  
Title 1 ◽  
Flash Vacuum Pyrolysis ◽  
Vacuum Pyrolysis ◽  
Naphthoic Acid

Condensation of 4-methoxy-2,6-dimethylbenzaldehyde with Meldrum's acid, and flash vacuum pyrolysis of the condensation product (12) gave in almost quantitative yield 7-methoxy-5-methyl-2-naphthol (9). This naphthol is a precursor of the title 1-carboxylic acid (6), an intercalating moiety of enediyne and other antibiotics.

Hyperbranched Aromatic Polyesters with Carboxylic Acid Terminal Groups

1994 ◽  
Vol 27 (6) ◽  
pp. 1611-1616 ◽  
Author(s):  
S. Richard Turner ◽  
Frank Walter ◽  
Brigette I. Voit ◽  
Thomas H. Mourey
Keyword(s):  
Carboxylic Acid ◽  
Aromatic Polyesters

scholarly journals Crystal structure of 8-[7,8-bis(4-chlorobenzoyl)-7H-cyclopenta[a]acenaphthylen-9-yl]naphthalene-1-carboxylic acid

2015 ◽  
Vol 71 (1) ◽  
pp. 38-41
Author(s):  
Jomon P. Jacob ◽  
M. Sithambaresan ◽  
Christy Kunjachan ◽  
M. R. Prathapachandra Kurup
Keyword(s):  
Carboxylic Acid ◽  
Three Dimensional ◽  
Ring System ◽  
Domino Reaction ◽  
Central Ring ◽  
Compound C ◽  
Naphthoic Acid ◽  
Fused Ring ◽  
Π Stacking Interaction ◽  
Fused Ring System

The title compound, C40H22Cl2O4, was formed by a Michael–Aldol domino reaction sequence, which coupled acenaphthenequinone with 4-chloroacetophenone in the presence of KOH in methanol. The dihedral angles between the central cyclopenta[a]acenaphthylene fused-ring system (r.m.s. deviation = 0.066 Å) and the 4-chlorobenzoyl rings are 62.25 (10) and 70.19 (10)°. The dihedral angle between the central ring system and the naphthoic acid grouping is 62.46 (7)°. This twisting of the pendant rings facilitates the formation of an intramolecular aromatic π–π stacking interaction between the 4-chlorobenzoyl and naphthoic acid rings, with centroid–centroid distances of 3.4533 (16) and 3.5311 (16) Å, and a C—H...π interaction between one of the H atoms of the central moiety and the 4-chlorobenzoyl ring with an H...π distance of 2.57 Å. In the crystal, carboxylic acid inversion dimers generateR22(8) loops. The dimers are linked by weak C—H...O and C—H...Cl hydrogen bonds and C—H...π interactions, generating a three-dimensional architecture.

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