Tag: M.W=400-450

Thiel, A. published the artcileBicolored phthaleins, Application of 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Z. physik. Chem. (1931), 352-6, database is CAplus.

The phthaleins of the series homologous to phenolphthalein have been assumed to show but one color change. α-Naphtholphthalein on very careful purification lost its pink to brownish color and was obtained colorless. In alc. the color changes are from colorless to orange-yellow and then by way of green to blue. This is difficult to observe in water because of the limited solubility of the free phthalein. p-Xylenolphthalein and thymolphthalein show similar color changes including the colorless stage in alc. The 1st change is from the colorless phthalein to that of the primary quinoid anions, and the 2nd change is from this color to the deep color of the secondary meriquinoid anions.

Z. physik. Chem. published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C11H21BF4N2O2, Application of 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Rozman, Martin published the artcileMulticolor Transparent-Conductive-Electrode Free Electronic Paper based on Steel Foil and Water Electrolyte with pH Indicator Dyes, Product Details of C28H18O4, the publication is Advanced Electronic Materials (2022), 8(4), 2100901, database is CAplus.

Electronic paper devices, also known as electrochromic devices, are known for their ability to change color and remain in a particular color state even after the elec. power is turned off. Traditional devices such as electrochromic windows use mechanisms such as electrophoresis or intercalation and use special materials such as anhydrous electrolytes and transparent conductive materials (TCMs). As a result, these devices can sometimes be relatively difficult to assemble, especially in developing countries where such materials are difficult to obtain. Recently, some improvements are made by using alternative electrode positioning that do not require TCM. Here, a novel multicolor display module that is recyclable, can be fabricated from readily available materials, and can be scaled according to the desired screen size is presented. The presented device is a semi-open electrochem. device that uses pH indicator dyes and an aqueous electrolyte solution in combination with readily available stainless steel sheet.

Advanced Electronic Materials published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Product Details of C28H18O4.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Rohatgi, H. L. published the artcileOrganomercury derivatives as antiseptics. II. Symmetrical phthaleins and fluoresceins, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Indian Journal of Applied Chemistry (1958), 117-20, database is CAplus.

Several sym. phthaleins and fluoresceins, their Hg and Br derivatives, were prepared and tested for bactericidal activity. Phthalic anhydride was treated with phenols to give the following compounds (phenol, % yield, dye formula, m.p. given): m-cresol, 54, C₂₂H₁₆O₃, 215°; p-cresol, 54, C₂₂H₁₆O₃, 246°; pyrocatechol, 54, C₂₀H₁₂O₅, 200°; hydroquinone, 51, C₂₀H₁₂O₅, 226°; pyrogallol, 71, C₂₀H₁₂O₇, 285°; phloroglucinol, 57, C₂₀H₁₂O₇, 250°; 1-naphthol, 49, C₂₈H₁₈O₄, 234-5°; and 2-naphthol, 50, C₂₈H₁₆O₃, 293°. The dyes were mercurated by the method of White (C.A. 15, 536) and the Hg substituents replaced by Br to give the following derivatives (dye, formula of Hg derivative, color of Hg derivative, color of Br derivative, m.p. of Br derivative given): phenolphthalein, C₂₀H₁₁O₄(HgOAc)₂(HgOH)₂, light pink, light red, >300°; ο-cresolphthalein, C₂₂H₁₆O₄(HgOAc)₂, green, orange, 255°; 3,6-dimethylfluoran, C₂₂H₁₄O₃(HgOAc)₂, brown, orange, 249-50°; 2,7-dimethylfluoran, C₂₂H₁₄O₃(HgOAc)₂, brown, orange, 984-5°; 4,5-dihydroxyfluoran, C₂₀H₁₀O₅(HgOH)₂, green, dirty orange, 285°; 3,6-dihydroxyfluoran, C₂₀H₈O₅(HgOAc)₄ red, orange-red, >300°; 2,7-dihydroxyfluoran, C₂₀H₁₀O₅(HgOH)₂, brown, dirty orange, 200° (decomposition); 4,5-dihydroxyfluorescein, C₂₀H₁₀O₇(HgOAc)₂, deep red, red, >300°; 1,8-dihydroxyfluorescein, C₂₀H₈O₇(HgOAc)₄, dirty red, red, >300°; α-naphthophthalein, C₂₈H₁₇O₄HgOAc, black, brown, >300°; and β-naphthophthalein, C₂₈H₁₅O₃HgOAc, black-brown, >300°. The mercurated compounds were more active against Staphylococcus aureus and Escherichia coli than the dyes but not more active than mercurochrome.

Indian Journal of Applied Chemistry published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Arbatsky, I. W. published the artcileTitration theory of dilute solutions, Name: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Zeitschrift fuer Analytische Chemie (1938), 117-26, database is CAplus.

The theory of titrating dilute solutions is discussed with respect to the magnitude of the error and the determination of the proper correction values. The titration of carbonates with phenolphthalein and α-naphtholphthalein as indicators is discussed in detail and the formulas for determining the correction factor are worked out. The advantages of the latter indicator are pointed out with respect to this titration.

Zeitschrift fuer Analytische Chemie published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Name: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Aulin-Erdtman, Gunhild published the artcileValue of indicators for the determination of the acid number of tall oil, SDS of cas: 596-01-0, the publication is Svensk Papperstidning (1942), 333-5, database is CAplus.

The suitability of α-naphtholphthalein and Nile blue as indicators for the determination of the acid number of tall oil was investigated by means of potentiometric titrations on alc. solutions of model substances (oleic acid and purified resin acids) as well as of a distilled tall oil, in the presence of these indicators. Both indicators proved to be suitable but Nile blue could be used only if the solution contained less than 10% of water, because the color of this indicator in the range of the end point depends upon its water content. When α-naphtholphthalein is used, the end point should be taken at a dark-green color; Nile blue requires a shade between red and scarlet. Where greater accuracy is demanded, the potentiometric method should be used.

Svensk Papperstidning published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, SDS of cas: 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Buch, Kurt published the artcileSpectrophotometric investigation of color indicators, HPLC of Formula: 596-01-0, the publication is Soc. Sci. Fennica Commentationen. Phys. Math. (1926), 2(Nos. 19-30), 20 pp., database is CAplus.

The spectrophotometer offers certain advantages for determining p_H values, particularly in natural waters such as sea water. If the relationship between light absorption and hydrogen-ion concentration is known, no comparison solution is necessary. In this paper the optical properties of α-naphtholphthalein, bromocresol purple, bromothymol blue and phenol red were studied near the neutral point. The light absorption of solutions of definite concentration for different wave lengths was determined both in alk. and in acid solution This is necessary to show the sort of light most suitable for the colorimetric determinations The indicators mixed with buffer solutions were then studied with the light of chosen wave length with respect to the dependence of the light absorption upon H-ion concentration In this way the ionization constants of the indicators were determined with considerable accuracy.

Soc. Sci. Fennica Commentationen. Phys. Math. published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, HPLC of Formula: 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Buch, Kurt published the artcileThe influence of temperature on pit determinations with color indicators, Quality Control of 596-01-0, the publication is Beret. 18th Skand. Naturforskermode (Copenhagen) (1929), 229-32, database is CAplus.

The buffer solution should preferably be brought to the temperature of sea water in situ but if Walbum’s correction tables are used this cannot be under 10°. The p_H of a sample at t° is the p_H at the buffer t + α(t_a -t_b). α from Walbum’s table: for α-naphthophthalein -0.0084, phenolphthalein -0.01, phenol red 0.01 and cresol red -0.0053. If the temperature has changed during the colorimetric readings also add α'(t’_a – t_a), α’ being 0.006 for α-naphthophthalein and 0.004 for phenol and cresol red. Phenolplithalein requires no correction.

Beret. 18th Skand. Naturforskermode (Copenhagen) published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Quality Control of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Buch, Kurt published the artcileThe influence of temperature on pit determinations with color indicators, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Suomen Kemistiseuran Tiedonantoja (1930), 2, database is CAplus.

The buffer solution should preferably be brought to the temperature of sea water in situ but if Walbum’s correction tables are used this cannot be under 10°. The p_H of a sample at t° is the p_H at the buffer t + α(t_a – t_b). α from Walbum’s table: for α-naphthophthalein -0.0084, phenolphthalein -0.01, phenol red 0.01 and cresol red -0.0053. If the temperature has changed during the colorimetric readings also add α'(t_a – t_a), α’ being 0.006 for α-naphthophthalein and 0.004 for phenol and cresol red. Phenolplithalein requires no correction.

Suomen Kemistiseuran Tiedonantoja published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Buch, Kurt published the artcileColor and acid characteristics of α-naphtholphthalein, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Suomen Kemistiseuran Tiedonantoja (1934), 6-17, database is CAplus.

Spectrophotometric measurements were made in alk., acid and borax buffer solutions on α-naphtholphthalein prepared according to Sörensen and Palitsch (C. A. 4, 1956). In 0.1% HCl it was nearly colorless at 0.007 g./l. The secondary ion shows absorption for wave length 649 μ, and both primary and secondary ions for 496 μ. The relative concentrations can be calculated from the extinction coefficients for these wave lengths. In this way the secondary dissociation constant is found to be 0.99 × 10^-8, and the primary 5.5 × 10^-6.

Suomen Kemistiseuran Tiedonantoja published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Delcourt, R. published the artcileElectrophoretic behavior of phthaleins alone and in the presence of proteins, Quality Control of 596-01-0, the publication is Protides of the Biological Fluids (1959), 119-26, database is CAplus.

cf. C.A. 53, 5370g. The mobility of 16 phthalein dyes and their binding of human serum albumin was studied by paper electrophoresis at pH 8.6. By considering phenolphthalein as the simplest member of the series, mobility is diminished by methylation of the phenol moiety; sulfonation augments mobility without suppressing the effect of methylation, while halogenation suppresses the influence of methylation. For the formation of complexes with albumin, the presence of a halogen atom in the phthalein is essential. Affinity of halogenated phthaleins for proteins depends on the nature of the halogen (Cl < Br < I). Thus, iodophthalein is more firmly attached to the protein and is able to displace bromo- and chloro-phthalein from their protein complexes. It was not possible to determine which free groups on the protein are involved in this binding.

Protides of the Biological Fluids published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Quality Control of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem