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N-Methylmaleimide is an electron deficient olefin that acts as a thiol-blocking reagent.
Michael E. Kopach.; Dean Harman, W. The Osmium(II)-Promoted [4 + 2] Cycloaddition Reaction of Anisole and N-Methylmaleimide and Characterization of the .eta.2-4H-Anisolium Intermediate. J. Org. Chem. 1994, 59, (22), 6506-6507.
Ronald N. Warrener. Isolation of isobenzofuran, a stable but highly reactive molecule. J. Am. Chem. Soc. 1971, 93, (9), 2346-2348.
Reactive dienophile and dipolarophile.
Hazard Statements: H300-H311+H331-H314-H317-H335
Fatal if swallowed. Toxic in contact with skin. Toxic if inhaled. Causes severe skin burns and eye damage. May cause an allergic skin reaction. May cause respiratory irritation.
Precautionary Statements: P260-P264b-P270-P271-P272-P280-P301+P310-P303+P361+P353-P304+P340-P305+P351+P338-P310-P330-P331-P363-P501c
Do not breathe dust/fume/gas/mist/vapours/spray. Wash face, hands and any exposed skin thoroughly after handling Do not eat, drink or smoke when using this product. Use only outdoors or in a well-ventilated area. Contaminated work clothing should not be allowed out of the workplace. Wear protective gloves/protective clothing/eye protection/face protection. IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician. IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. Rinse mouth. Do NOT induce vomiting. Wash contaminated clothing before reuse. Dispose of contents/ container to an approved waste disposal plant