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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-H310-H330-H314-H318-H317
Fatal if swallowed. Fatal in contact with skin. Fatal if inhaled. Causes severe skin burns and eye damage. Causes serious eye damage. May cause an allergic skin reaction.
Precautionary Statements: P301+P310a-P303+P361+P353-P304+P340-P305+P351+P338-P320-P405-P501a
IF SWALLOWED: 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. Specific treatment is urgent (see label). Store locked up. Dispose of contents/container in accordance with local/regional/national/international regulations.