Glycin

Not to be confused with glycine.

Glycin[1]
IUPAC name 2-(4-hydroxyphenyl)aminoacetic acid
Other names N-(4-hydroxyphenyl)glycine p-hydroxyanilinoacetic acid photoglycine
Identifiers
CAS number	122-87-2
PubChem	67149
ChemSpider	60494 Y
ChEBI	CHEBI:55443 Y
Jmol-3D images	Image 1
SMILES O=C(O)CNc1ccc(O)cc1
InChI InChI=1S/C8H9NO3/c10-7-3-1-6(2-4-7)9-5-8(11)12/h1-4,9-10H,5H2,(H,11,12) Y Key: WRUZLCLJULHLEY-UHFFFAOYSA-N Y InChI=1/C8H9NO3/c10-7-3-1-6(2-4-7)9-5-8(11)12/h1-4,9-10H,5H2,(H,11,12) Key: WRUZLCLJULHLEY-UHFFFAOYAB
Properties
Molecular formula	C8H9NO3
Molar mass	167.16 g/mol
Melting point	248 °C
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Glycin, or N-(4-hydroxyphenyl)glycine, is N-substituted p-aminophenol. It is a photographic developing agent used in classic B&W developer solutions.^[2] It is a derivative of the amino acid glycine. When fresh, it is typically characterized as thin plates of white or silvery powder, turning brown with age. It is sparingly soluble in water and most organic solvents; it is readily soluble in alkalies and acids.

Glycin is related to 4-aminophenol and Metol. Compared to Metol, glycin has a carboxyl group attached to the methyl group of the Metol. This weakens the reduction potential of the compound and the two developers have markedly different character. Glycin is slower acting, but much longer lasting in solution. Glycin is rarely used as a developing agent today, primarily because it is expensive and manufactured for specialty applications only. In its dry form, it also has limited shelf life compared to Metol and Phenidone.

Glycin can be synthesized by a number of ways. One method is to react p-aminophenol with chloracetic acid in a solvent and purify glycin.

Other uses of glycin can be found in some procedures of analytical chemistry.

References

1. ^ Merck Index, 11th Edition, 4771.
2. ^ Photographic Chemical Descriptions