|UN#:||UN3261||Hazard Class:||8||Packing Group:||II
||C4H2O4 || ||Melting point:
||114.06 || ||Flash point:
Interesting dibasic acid, readily forming salts, acid chloride, esters, amides, etc. Esters of squaric acid have been used to synthesize chiral bioisosteres for the amino acid functionality: J. Org. Chem., 57, 6896 (1992).
For reviews of squaric acid and its derivatives, see: Synthesis, 1, 649, 869 (1978); 961 (1980). See also: J. Chem. Soc., Perkin 1, 263 (1993).
|Harmonized Tariff Code:
GHS Hazard and Precautionary Statements
Hazard Statements : H314-H318
Causes severe skin burns and eye damage. Causes serious eye damage.
Precautionary Statements : P260-P303+P361+P353-P305+P351+P338-P301+P330+P331-P405-P501A
Do not breathe dust/fume/gas/mist/vapours/spray. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF SWALLOWED: Rinse mouth. Do NOT induce vomiting. Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.
Risk & Safety
|When using do not eat or drink. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Wear suitable protective clothing, gloves and eye/face protection. In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).