alpha-Naphtholphthalein
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- $8 - $3160
- Product name: alpha-Naphtholphthalein
- CAS: 596-01-0
- MF: C28H18O4
- MW: 418.44
- EINECS:209-875-5
- MDL Number:MFCD00036202
- Synonyms:1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxy-1-naphthalenyl)-;à-naphtholphthalein;3,3-bis(4-hydroxy-1-naphthyl)phthalide;A-NAPHTHOLPHTHALEIN PRACTICAL GRADE;ALPHA-NAPHTHOLPHTHALEIN INDICATOR;1-NAPHTHOLPHTHALEIN, INDICATOR;ALPHA-NAPHTHOLPHTHALEIN(0.1% IN CA. 50% ETHANOL)[FOR PH DETERMINATION];alpha-Naphtholphthalein, indicator, pure
58 prices
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Brand
- aablocks
- AHH
- AK Scientific
- Alichem
- American Custom Chemicals Corporation
- Arctom
- Chemenu
- Chem-Impex
- ChemScene
- Crysdot
- honeywell
- Sigma-Aldrich
- TCI Chemical
- Thermo Scientific Chemicals
- TRC
- Usbiological
Package
- 10mg
- 1g
- 5g
- 10G
- 25g
- 50g
- 100g
- 10g|GlassBottle
- Manufactureraablocks
- Product numberAA00E8IP
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98%
- Packaging5g
- Price$19
- Updated2026-05-28
- Buy
- Manufactureraablocks
- Product numberAA00E8IP
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98%
- Packaging25g
- Price$64
- Updated2026-05-28
- Buy
- Manufactureraablocks
- Product numberAA00E8IP
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98%
- Packaging1g
- Price$8
- Updated2026-05-28
- Buy
- ManufacturerAHH
- Product numberMT-19328
- Product description1-Naphtholphthalein 85%
- Packaging25g
- Price$628
- Updated2021-12-16
- Buy
- ManufacturerAHH
- Product numberMT-19328
- Product description1-Naphtholphthalein 97%
- Packaging25g
- Price$628
- Updated2026-05-25
- Buy
- ManufacturerAHH
- Product numberMT-19328
- Product description1-Naphtholphthalein 97%
- Packaging25g
- Price$628
- Updated2026-05-26
- Buy
- ManufacturerAK Scientific
- Product numberZ3617
- Product descriptionalpha-Naphtholphtalein
- Packaging25g
- Price$399
- Updated2021-12-16
- Buy
- ManufacturerAlichem
- Product number596010
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one
- Packaging25g
- Price$250.92
- Updated2021-12-16
- Buy
- ManufacturerAmerican Custom Chemicals Corporation
- Product numberCHM0018271
- Product descriptionALPHA-NAPHTHOLPHTHALEIN 95.00%
- Packaging1G
- Price$657.01
- Updated2021-12-16
- Buy
- ManufacturerArctom
- Product numberBD-A352623
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98%
- Packaging100g
- Price$191
- Updated2026-05-25
- Buy
- ManufacturerArctom
- Product numberBD-A352623
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98%
- Packaging100g
- Price$191
- Updated2026-05-26
- Buy
- ManufacturerArctom
- Product numberBD-A352623
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98%
- Packaging25g
- Price$57
- Updated2026-05-25
- Buy
- ManufacturerArctom
- Product numberBD-A352623
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98%
- Packaging25g
- Price$57
- Updated2026-05-26
- Buy
- ManufacturerArctom
- Product numberBD-A352623
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98%
- Packaging1g
- Price$9
- Updated2026-05-25
- Buy
- ManufacturerArctom
- Product numberBD-A352623
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98%
- Packaging1g
- Price$9
- Updated2026-05-26
- Buy
- ManufacturerArctom
- Product numberBD-A352623
- Product description3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98%
- Packaging5g
- Price$18
- Updated2026-05-25
- Buy
| Manufacturer | Product number | Product description | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|
| aablocks | AA00E8IP | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98% | 5g | $19 | 2026-05-28 | Buy |
| aablocks | AA00E8IP | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98% | 25g | $64 | 2026-05-28 | Buy |
| aablocks | AA00E8IP | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98% | 1g | $8 | 2026-05-28 | Buy |
| AHH | MT-19328 | 1-Naphtholphthalein 85% | 25g | $628 | 2021-12-16 | Buy |
| AHH | MT-19328 | 1-Naphtholphthalein 97% | 25g | $628 | 2026-05-25 | Buy |
| AHH | MT-19328 | 1-Naphtholphthalein 97% | 25g | $628 | 2026-05-26 | Buy |
| AK Scientific | Z3617 | alpha-Naphtholphtalein | 25g | $399 | 2021-12-16 | Buy |
| Alichem | 596010 | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one | 25g | $250.92 | 2021-12-16 | Buy |
| American Custom Chemicals Corporation | CHM0018271 | ALPHA-NAPHTHOLPHTHALEIN 95.00% | 1G | $657.01 | 2021-12-16 | Buy |
| Arctom | BD-A352623 | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98% | 100g | $191 | 2026-05-25 | Buy |
| Arctom | BD-A352623 | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98% | 100g | $191 | 2026-05-26 | Buy |
| Arctom | BD-A352623 | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98% | 25g | $57 | 2026-05-25 | Buy |
| Arctom | BD-A352623 | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98% | 25g | $57 | 2026-05-26 | Buy |
| Arctom | BD-A352623 | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98% | 1g | $9 | 2026-05-25 | Buy |
| Arctom | BD-A352623 | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98% | 1g | $9 | 2026-05-26 | Buy |
| Arctom | BD-A352623 | 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one 98% | 5g | $18 | 2026-05-25 | Buy |
Properties
Melting point :238-240 °C(lit.)
Boiling point :496.21°C (rough estimate)
Density :1.1532 (rough estimate)
bulk density :350kg/m3
vapor density :14.44 (vs air)
refractive index :1.6400 (estimate)
storage temp. :Store below +30°C.
solubility :Solubility Practically insoluble in water; soluble in ethanol
pka :8.0, 8.2, 8.5(at 25℃)
form :Powder
color :Pink to beige or brown
PH Range :7.1(brownish)-8.3(blue/green)
PH :pH : 7.1～8.7
Odor :Characteristic odour
Water Solubility :Soluble in ethanol. Insoluble in water.
λmax :648nm
Merck :14,6389
BRN :97816
InChI :1S/C28H18O4/c29-25-15-13-23(17-7-1-3-9-19(17)25)28(22-12-6-5-11-21(22)27(31)32-28)24-14-16-26(30)20-10-4-2-8-18(20)24/h1-16,29-30H
InChIKey :HQHBAGKIEAOSNM-UHFFFAOYSA-N
SMILES :O1C(c6c(cccc6)C1=O)(c4c5c(c(cc4)O)cccc5)c2c3c(c(cc2)O)cccc3
CAS DataBase Reference :596-01-0(CAS DataBase Reference)
Boiling point :496.21°C (rough estimate)
Density :1.1532 (rough estimate)
bulk density :350kg/m3
vapor density :14.44 (vs air)
refractive index :1.6400 (estimate)
storage temp. :Store below +30°C.
solubility :Solubility Practically insoluble in water; soluble in ethanol
pka :8.0, 8.2, 8.5(at 25℃)
form :Powder
color :Pink to beige or brown
PH Range :7.1(brownish)-8.3(blue/green)
PH :pH : 7.1～8.7
Odor :Characteristic odour
Water Solubility :Soluble in ethanol. Insoluble in water.
λmax :648nm
Merck :14,6389
BRN :97816
InChI :1S/C28H18O4/c29-25-15-13-23(17-7-1-3-9-19(17)25)28(22-12-6-5-11-21(22)27(31)32-28)24-14-16-26(30)20-10-4-2-8-18(20)24/h1-16,29-30H
InChIKey :HQHBAGKIEAOSNM-UHFFFAOYSA-N
SMILES :O1C(c6c(cccc6)C1=O)(c4c5c(c(cc4)O)cccc5)c2c3c(c(cc2)O)cccc3
CAS DataBase Reference :596-01-0(CAS DataBase Reference)
Safety Information
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Description
Indicator in 0.1% or 0.04% alcohol solution.α-Naphtholphthalein is used as a pH indicator and operates in the pH ranges between 7.3 and 8.7. It is also used in the designing of optical carbon dioxide sensor based on fluorescence intensity.Related product price
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