Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Methyl caprolactam

Arex A process for removing aromatic hydrocarbons from petroleum streams by extraction with 1-methyl piperidone (N-methyl caprolactam) at 60°C. Developed by Leuna Werke, Germany. [Pg.25]

Because the reactions (b) and (c) cannot proceed, if there is no hydrogen at the amide group, N-alkylated caprolactams failed to polymerize by basic catalysts. Indications of N-methyl caprolactam polymerization and copolymerization are to be revised experiments describing such polymerizations couldn t be reproduced and the authors mentioned seem to be mislead by results obtained by the polymerization of samples of N-methylcaprolactam containing appreciable amounts of unsubstituted caprolactam. [Pg.586]

Walther et al. improved the Na0Ph/C02 system by tuning the role of the solvent, such that the carboxylation of acetone was carried out selectively by sodium phenoxide with N-methyl-caprolactam under 0.1 MPa C02 to afford 3-ketoglutaric acid in 65% yield [34]. The same authors reported the conversion of acetyl-naphthalene (acetonaphthone) to acetyl-naphthalene carboxylic acid with 84% yield, and of cyclohexanone to cyclohexane-2,6-dicarboxylic acid in 56% yield. [Pg.100]

Comparing the structure of the monomer with that of the polymer as shown in Table I, we see that the polymerization of the / -carboxy-methyl caprolactam must involve isomerization of the monomer ring system. This isomerization may be described by several possible processes, all of which are characterized by reaction between the amide and acid group of the / -carboxymethyl caprolactam. Based upon the results of our studies on the structure of this polymer (5) we may eliminate confidently those processes according to which the formation of the glutarimide moiety results either by intrachain cyclization or by trans-cyclization of certain intermediate polymer structures. The former would involve a polymer formed by a conventional ring opening polymerization ... [Pg.735]

The constants for H-bridging complex formation between D-glucose, cellobiose, xylose, and phenol as models for cellulose and different 0-basic dipolar molecules such as N-methyl-caprolactam HMPA, and DMSO in chloroform and ethanol have been determined. Evidence of hydrogen bonding in D-fructose as shown in (28) has been obtained from variable temperature high field n.m.r. spectroscopy. The preponderance of the -furanose form in DMSO is attributed to this feature. The kinetics of the tautomeric equilibria were studied. [Pg.9]

The following abbreviations have been employed for the various lactams BuL for y-butyrolactam (n = 3), NMBuL for N-methyl-y-butyrolactam, Val for 5-valerolactam (n = 4) NMVaL for N-methyl-5-valerolactam, CaL for -caprolactam (n = 5), and NMCaL for N-methyl- -caprolactam. [Pg.140]

Conceivable mechemisms entailing catalysis by lonlzable carboxy groups are shown in Figure 6 for the conversion of 6 car-boxy methyl caprolactam, the rearrcuigement of 5,5-dimethyl-4-carboxy-2-pyrrolidone, and the isomerization of 6,6-dimethyl-4-carboxy-2-piperidone. [Pg.246]

The block-copolymers of polysulfone and polyesters can be also produced [188] by the reaction of aromatic polysulfones in environment of dipolar aprotone dissolvents (dimethylsulfoxide, N-methylpirrolydone, N-methyl-caprolactam, N, N -dimethylacetamides or their mixes) with alyphatic polyesters containing not less than two edge OH-groups in the presence of basic catalyst-carbonates of alkali metals Li, Na, K. [Pg.59]


See other pages where Methyl caprolactam is mentioned: [Pg.222]    [Pg.61]    [Pg.56]    [Pg.56]    [Pg.590]    [Pg.601]    [Pg.70]    [Pg.338]    [Pg.372]    [Pg.372]    [Pg.824]    [Pg.868]    [Pg.868]    [Pg.510]    [Pg.513]    [Pg.261]    [Pg.275]    [Pg.234]    [Pg.241]    [Pg.248]    [Pg.1189]    [Pg.237]   
See also in sourсe #XX -- [ Pg.601 ]




SEARCH



Caprolactam

Caprolactam, methylation

Caprolactam, methylation

Caprolactamate

Caprolactams

Methylation, of <-caprolactam

Methylation, of e-caprolactam

Methylation, of e-caprolactam with methyl iodide

© 2024 chempedia.info