A | B | C | D | E | F | G | H | CH | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
Names | |
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Preferred IUPAC name
3,3-Bis-2-benzofuran-1(3H)-one | |
Identifiers | |
3D model (JSmol)
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ChEMBL | |
ChemSpider | |
ECHA InfoCard | 100.004.300 |
EC Number |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
C28H30O4 | |
Molar mass | 430.544 g·mol−1 |
Appearance | White powder |
Melting point | 248 to 252 °C (478 to 486 °F; 521 to 525 K) (decomposes) |
Hazards[1] | |
GHS labelling: | |
Warning | |
H341, H350, H361 | |
P201, P202, P210, P233, P240, P241, P242, P243, P280, P281, P303+P361+P353, P308+P313, P370+P378, P403+P235, P405, P501 | |
NFPA 704 (fire diamond) | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa).
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Thymolphthalein is a phthalein dye used as an acid–base (pH) indicator. Its transition range is around pH 9.3–10.5. Below this pH, it is colorless; above, it is blue. The molar extinction coefficient for the blue thymolphthalein dianion is 38,000 M−1 cm−1 at 595 nm.[2]
Thymolphthalein (pH indicator) | ||
below pH 9.3 | above pH 10.5 | |
9.3 | ⇌ | 10.5 |
Thymolphthalein is also known to have use as a laxative[3] and for disappearing ink.[4]
Preparation
Thymolphthalein can be synthesized from thymol and phthalic anhydride.
See also
References
- ^ "Thymolphthalein". pubchem.ncbi.nlm.nih.gov.
- ^ Hahn HH; Cheuk SF; Elfenbein S; Wood WB (April 1970). "Studies on the Pathogenesis of Fever: Xix. Localization of Pyrogen in Granulocytes". The Journal of Experimental Medicine. 131 (4): 701–9. doi:10.1084/jem.131.4.701. PMC 2138774. PMID 5430784.
- ^ Hubacher, MH; Doernberg, S; Horner, A (1953). "Laxatives: chemical structure and potency of phthaleins and hydroxyanthraquinones". Journal of the American Pharmaceutical Association. 42 (1): 23–30. doi:10.1002/jps.3030420108. PMID 13034620.
- ^ Katz, David A. (1982). "Disappearing Ink" (PDF). www.chymist.com. Retrieved August 14, 2017.
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