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The isocyanate functional group. In organic chemistry, isocyanate is the functional group with the formula R−N=C=O. Organic compounds that contain an isocyanate group are referred to as isocyanates. An organic compound with two isocyanate groups is known as a diisocyanate.
In a similar fashion, the intermediate isocyanate can be trapped by tert-butyl alcohol, yielding the tert-butoxycarbonyl (Boc)-protected amine. The Hofmann Rearrangement also can be used to yield carbamates from α,β - unsaturated or α- hydroxy amides [ 2 ] [ 8 ] or nitriles from α,β- acetylenic amides [ 2 ] [ 9 ] in good yields (≈70%).
In this context, the reaction is also known as Saytzeff's isocyanide test. [2] In this reaction, the analyte is heated with alcoholic potassium hydroxide and chloroform. If a primary amine is present, the isocyanide (carbylamine) is formed, as indicated by a foul odour.
Methylene diphenyl diisocyanate (MDI) is an aromatic diisocyanate. Three isomers are common, varying by the positions of the isocyanate groups around the rings: 2,2′-MDI, 2,4′-MDI, and 4,4′-MDI. The 4,4′ isomer is most widely used, and is also known as 4,4′-diphenylmethane diisocyanate. [3] This isomer is also known as Pure MDI.
The activated isocyanate then quickly reacts with the indole ring in an electrophilic aromatic substitution reaction to give the amide in 94% yield, and subsequent steps give dievodamine. [ 29 ] The Curtius rearrangement in the total synthesis of Dievodiamine
Cobalt(II) cyanate is the hypothetical inorganic compound with the formula Co(OCN) 2.. The simple cobalt(II) cyanate has not been proven to be made. However, the tetraisocyanatocobalt(II) ion (Co(NCO) 4 2-) is known and its blue color and is used as a qualitative test for cobalt(II) ions.
In nucleophilic substitution reactions cyanate usually forms an isocyanate. Isocyanates are widely used in the manufacture of polyurethane [ 17 ] products and pesticides ; methyl isocyanate , used to make pesticides, was a major factor in the Bhopal disaster .
Tetramethylxylylene diisocyanate (TMXDI) is an organic compound with the formula C 6 H 4 (CMe 2 NCO) 2 (Me = CH 3).Introduced in the 1980s by American Cyanamid, the molecule features two isocyanate groups.