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7493-95-0 Usage

Chemical Properties

Off-White Crystalline Solid


p-Nitrophenyl α-D-Galactopyranoside (cas# 7493-95-0) is a compound useful in organic synthesis.


ChEBI: An alpha-D-galactopyranoside having a 4-nitrophenyl substituent at the anomeric position.

Purification Methods

Purify 4-nitrophenyl--D-galactopyranoside by recrystallisation from H2O or aqueous EtOH. The monohydrate has m 85o which resolidifies and melts again at 151-152o (the hemihydrate), then resolidifies again and melts at 173o to give the anhydrous form. Drying the monohydrate at 60o yields the hemihydrate, and drying at 100o gives the anhydrous compound. The tetraacetate has m 147o after drying at 100o. [Jermyn Aust J Chem 15 569 1962, Helfreich & Jung Justus Liebigs Ann Chem 589 77 1954.] It is a substrate for galactosidase [Dangelmaier & Holmsen Anal Biochem 104 182 1980]. [Beilstein 17/7 V 55.]

Check Digit Verification of cas no

The CAS Registry Mumber 7493-95-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,4,9 and 3 respectively; the second part has 2 digits, 9 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 7493-95:
130 % 10 = 0
So 7493-95-0 is a valid CAS Registry Number.

7493-95-0 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
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  • Alfa Aesar

  • (L13376)  4-Nitrophenyl-alpha-D-galactopyranoside, 98+%   

  • 7493-95-0

  • 100mg

  • 184.0CNY

  • Detail
  • Alfa Aesar

  • (L13376)  4-Nitrophenyl-alpha-D-galactopyranoside, 98+%   

  • 7493-95-0

  • 500mg

  • 604.0CNY

  • Detail



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 12, 2017

Revision Date: Aug 12, 2017


1.1 GHS Product identifier

Product name 4-nitrophenyl-α-D-galactoside

1.2 Other means of identification

Product number -
Other names 4-Nitrophenyl a-D-galactopyranoside

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:7493-95-0 SDS

7493-95-0Relevant articles and documents

Syntheses of p-nitrophenyl 3- and 4-thio-β-d-glycopyranosides

Chen, Hong-Ming,Withers, Stephen G.

experimental part, p. 2596 - 2604 (2011/01/12)

Thioglycosides have proved to be useful, enzymatically stable analogs of glycosides for structural and mechanistic studies and their synthesis is considerably simplified through the use of thioglycoligases. As part of an investigation into the use of thio


Apparu, Maecel,Blanc-Muesser, Michele,Defaye, Jacques,Driguez, Hugues

, p. 314 - 320 (2007/10/02)

The action of p-nitrophenol penta-O-acetyl-β-D-galactopyranose in dichloromethane, in the presence of stannic tetrachloride gave p-nitrophenyl α-D-galactoside in fair yield.This technique failed when o-nitrophenol was used.Tetra-O-acetyl-β-D-galactopyranosyl and hepta-O-acetyl-β-maltosyl chlorides were converted to p- or o-nitrophenyl α-D-glycosides and p-nitrophenyl α-D-1-thioglycosides in good yield using hexamethylphosphoramide as a solvent and the sodium salt of the phenols as nucleophiles.The galactosides have been functionalized for further condensation at the C-4 position by selective benzoylation.

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