Monograph pubs.acs.org/doi/book/10.1021/acsreagents
4-(Dimethylamino)benzaldehyde Part 4, Monographs for Reagent Chemicals: General Descriptions, Specifications, and Tests eISBN: 9780841230460 Tom Tyner Chair, ACS Committee on Analytical Reagents James Francis Secretary, ACS Committee on Analytical Reagents
ABSTRACT This monograph for 4-(Dimethylamino)benzaldehyde provides, in addition to common physical constants, a general description including typical appearance, applications, and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Melting Point, Solubility in Alcohol, Color (APHA) of Alcohol Solution, Solubility in Hydrochloric Acid, Color of Hydrochloric Acid Solution, and Residue after Ignition.
(CH3)2NC6H4CHO
Formula Wt 149.00
CAS No. 100-10-7
GENERAL DESCRIPTION Typical appearance . . . . . . . . . . . . . . . . . . . white to pale yellow solid Applications . . . . . . . . . . . . . . . . . . . . . . . . derivatizing agent Aqueous solubility . . . . . . . . . . . . . . . . . . . . very slightly soluble
SPECIFICATIONS Melting point . . . . . . . . . . . . . . . . . . . . . . . 73–75 °C Maximum Allowable Solubility in alcohol . . . . . . . . . . . . . . . . . . . Passes test Color (APHA) of alcohol solution . . . . . . . . . . . 60
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4120 ACS Reagent Chemicals, Part 4
ACS Reagent Chemicals
Monograph
pubs.acs.org/doi/book/10.1021/acsreagents
Solubility in hydrochloric acid . . . . . . . . . . . . Passes test Color of hydrochloric acid solution . . . . . . . . . Passes test Residue after ignition. . . . . . . . . . . . . . . . . . 0.1%
TESTS Melting Point [Part 2: Measurement of Physical Properties; Melting Point].
Solubility in Alcohol Dissolve 1.0 g in 25 mL of alcohol. The solution should be clear.
Color (APHA) of Alcohol Solution [Part 2: Measurement of Physical Properties; Color (APHA); Procedure for Color (APHA)]. Dissolve 4.0 g in alcohol, and dilute with alcohol to 100 mL.
Solubility in Hydrochloric Acid Dissolve 1.0 g in 20 mL of dilute hydrochloric acid (1:10). Dissolution should be complete; the solution, clear. Reserve the solution for the test for color of hydrochloric acid solution.
Color of Hydrochloric Acid Solution Transfer a portion of the solution prepared in the test for solubility in hydrochloric acid into a 1 cm curette. Measure the absorbance at 450 nm vs water. The absorbance should not exceed 0.1 AU.
Residue after Ignition [Part 2: Gravimetric Methods; Residue after Ignition]. Ignite 1.0 g.
© 2017 American Chemical Society
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DOI:10.1021/acsreagents.4120 ACS Reagent Chemicals, Part 4
