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Merck
CN

114553

Thymolphthalein

ACS reagent, Dye content 95 %

Synonym(s):

5′,5′′-Diisopropyl-2′,2′′-dimethylphenolphthalein

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About This Item

Empirical Formula (Hill Notation):
C28H30O4
CAS Number:
125-20-2
Molecular Weight:
430.54
UNSPSC Code:
12171500
NACRES:
NA.47
PubChem Substance ID:
24847182
EC Number:
204-729-7
Beilstein/REAXYS Number:
359413
MDL number:
MFCD00005909

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Product Name

Thymolphthalein, ACS reagent, Dye content 95 %

InChI

1S/C28H30O4/c1-15(2)20-13-23(17(5)11-25(20)29)28(22-10-8-7-9-19(22)27(31)32-28)24-14-21(16(3)4)26(30)12-18(24)6/h7-16,29-30H,1-6H3

InChI key

LDKDGDIWEUUXSH-UHFFFAOYSA-N

SMILES string

CC(C)c1cc(c(C)cc1O)C2(OC(=O)c3ccccc23)c4cc(C(C)C)c(O)cc4C

grade

ACS reagent

form

solid

composition

Dye content, 95%

clarity of soln

passes test

technique(s)

titration: suitable

visual transition interval

8.8-10.5, colorless to blue

mp

251-253 °C (lit.)

λmax

396 nm (2nd)
592 nm

Quality Level

200

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Application

Thymolphthalein has been used as a pH indicator in [14C] urea breath test to determine when the CO2 trap is full.

General description

Thymolphthalein (5′, 5′′-Diisopropyl-2′, 2′′-dimethylphenolphthalein) is an acid-base indicator which is colorless in solutions with a pH below 8.5 and blue in solutions with a pH above 9.5. Thymolphthalein has been used as an indicator in periodate-thiosulfate reaction.

Storage Class

11 - Combustible Solids

wgk

WGK 3

flash_point_f

Not applicable

flash_point_c

Not applicable

ppe

Eyeshields, Gloves, type N95 (US)

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Certificates of Analysis (COA)

Lot/Batch Number
BCCM2994
BCCM0868
BCCK0122
BCCJ2598
BCCG8415

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American Chemical Society, American Chemical Society. Committee on Analytical Reagents
Reagent Chemicals: Specifications and Procedures (2006)
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Stromberg S, et al.
Waste Management (New York, N.Y.), 34, 1939-1948 (2014)
Bassam Z. Shakhashiri
Chemical Demonstrations: A Handbook for Teachers of Chemistry, Volume 3, 3 (1983)
Rhesus monkey (Macaca mulatta) model of Helicobacter pylori: noninvasive detection and derivation of specific-pathogen-free monkeys.
Laboratory Animal Science, 49(2), 197-201 (1999)
Basal and insulin mediated VLDL-triglyceride kinetics in type 2 diabetic men.
S?rensen LP
Diabetes, 60(1), 88-96 (2011)
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