Ultraviolet Spectrometric Determination of Mixtures of Arylsulfonic Acids.

Arends, J. M.; Cerfontain, H.; Herschberg, I. S.; Prinsen, A. J.; Wanders, A. C. M.

doi:10.1021/ac60215a031

Cited by 31 publications

(17 citation statements)

References 12 publications

(4 reference statements)

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“…The analytical procedure used was that developed by Arends, et al (1964), and used by Cerfontain, et al (1963). This method combines the use of ultraviolet spectrophotometry with multivariable linear regression of a sample spectrum by a high-speed digital computer.…”

Section: Methodsmentioning

confidence: 99%

Maximization of the Conversion to m-Toluenesulfonic Acid in Sulfuric Acid Sulfonation

Broyles¹,

Eckert²

1973

Ind. Eng. Chem. Proc. Des. Dev.

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Section: Methodsmentioning

confidence: 99%

Maximization of the Conversion to m-Toluenesulfonic Acid in Sulfuric Acid Sulfonation

Broyles¹,

Eckert²

1973

Ind. Eng. Chem. Proc. Des. Dev.

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“…The latter method was used with the ortho-and para-isomers; for these substrates the composition of the reaction mixtures was analyzed by a three-component, three-wavelengths U.V. analysis using o-, p-, and 2,4-disulfonic acid as reference compounds (19,20).…”

Section: Methodsmentioning

confidence: 99%

“…In this connection the observation of the necess~ty of an additional molecule of sulfur trioxide in the aromatic sulfonylation by an arenepyrosulfonic acid (18) seems of related interest. the o-, p-, and 2,4-disulfonic acid as reference compounds (19,20). With the o-halogenobenzenesulfonic acids as substrate, the para-isomer and the 2,4-disulfonic acid are formed in a constant ratio.…”

Section: Reaction In 981% H2s0 At Highmentioning

confidence: 99%

Sulfonation and Isomerization of some Halogenobenzenesulfonic Acids

Cerfontain¹,

Koeberg-Telder²,

Voorspuy³

1972

Can. J. Chem.

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The behavior of the isomeric halogenobenzenesulfonic acids (halogen = F, CI, and Br) in sulfuric acid was studied. In 115% H2S04 at 25" only sulfonation takes place. Both the ortho-and para-isomers yield the l-halogenobenzene-2.4-disulfonic acid, whereas the meta-isomers yield a mixture of mainly 3,4-and 3 3 -with some 2,5-disulfonic acid.In 98.1% H2S04 at 150-17O0, both sulfonation and isomerization occur. The ortho-isomers are sulfonated to the 2,4-disulfonic acid and isomerized to the para-isomer in competing reactions. The para-isomers are sulfonated to the 2,4-disulfonic acids much more slowly than the ortho-isomers. The least reactive are the metaisomers which in competing reactions are sulfonated to a mixture of mainly 2,5-and 3,5-disulfonic acids, and isomerized to the para-isomers which eventually yield the 2.4-disulfonic acids.It is suggested that the formatcon of the 3,4-disulfonic acids from the meta-isomers in 115% H2S04 proceeds by an intramolecular rearrangement of the initially formed arenepyrosulfonic acids.Le comportement des acides halogenobenzenesulfoniques isomeres (halogene = F, CI, Br) dans l'acide sulfurique a ete ttudie. A 25' dansl'acide sulfurique a 115%, seule la sulfonation a lieu. Les isomeres ortho et para donnent tous deux I'acide halogCno-1 benzene disulfonique-2,4 tandis que les isomeres mtta conduisent A un melange constitue principalement des acides disulfoniques-3,4 et -3 3 et un peu de -2.4.Dans I'acide sulfurique a 98.1% a 150-170". la sulfonation et I'isomerisation ont lieu toutes les deux. Les isomeres ortho sont sulfonCs en acide disulfonique-2,4 et isomerists en para dans des reactions competitives. Les isomeres para donnent les acides disulfoniques-2,4 beaucoup plus lentement que pour les analogues ortho. Les moins rtactifs sont les isomtres meta qui, dans des reactions competitives, sont sulfonts en un melange d'acides disulfoniques-2.5 et -3,5 surtout et isomerisks en para pour donner eventuellement les acides disulfoniques-2,4.On pense que la formation des acides disulfoniques-3,4 a partir des isomtres meta dans H'SO, 1 I5%, se fait selon un rearrangement intramoltculaire des acides artnepyrosulfoniques initialement formts.

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“…A simple application is analysis of a mixture of components where spectra are known. Spectra of the pure components are recorded, and these "library spectra" are then used together with those of the unknown mixtures to compute the composition (7). It is assumed that the spectra of the mixtures are linear combinations of those of the individual components, and a simple least-squares procedure is used.…”

Section: Reportmentioning

confidence: 99%

“…A straightforward manipulation of Equations 1, 2, and 4 results in an expression for A; as a linear combination of the vectors, the coefficients being functions of the initial concentration (|A]oi and [B]oi), K, and the p's. Identification of these coefficients with the o's in Equation 3results in a relationship of the form a = £ £ ttjFCK-; [A)0, [BJo) (7) i-ij-i and K and the p's can be solved for by regression.…”

Section: Reportmentioning

confidence: 99%