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The global market for diisocyanates in the year 2000 was 4.4 million tonnes, of which 61.3% was methylene diphenyl diisocyanate (MDI), 34.1% was toluene diisocyanate (TDI), 3.4% was the total for hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI), and 1.2% was the total for various others. [18]
Ethyl benzoate, C 9 H 10 O 2, is an ester formed by the condensation of benzoic acid and ethanol. It is a colorless liquid that is almost insoluble in water, but miscible with most organic solvents. It is a colorless liquid that is almost insoluble in water, but miscible with most organic solvents.
The N=C and C=S distances are 117 and 158 pm. [2] By contrast, in methyl thiocyanate, N≡C and C−S distances are 116 and 176 pm. . Typical bond angles for C−N=C in aryl isothiocyanates are near 165°.
Ethyl 2-chloro-5-isocyanato-benzoate and ethyl 3-amino-4,4,4-trifluorocrotonate were reacted in the presence of a base to form a substituted urea intermediate which was cyclised to the pyrimidinedione, as shown. Further standard chemical transformations generated the final product. [6]
Benzoyl chloride, also known as benzenecarbonyl chloride, is an organochlorine compound with the formula C 7 H 5 ClO.It is a colourless, fuming liquid with an irritating odour, and consists of a benzene ring (C 6 H 6) with an acyl chloride (−C(=O)Cl) substituent.
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. [1] [2] [3] TMXDI is generally classified as an aliphatic isocyanate, which are generally more UV stable than their aromatic counterparts.
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The acceptor properties of HNCO are compared with other Lewis acid in the ECW model. Low-temperature photolysis of solids containing HNCO creates the tautomer cyanic acid H−O−C≡N, also called hydrogen cyanate. [15] Pure cyanic acid has not been isolated, and isocyanic acid is the predominant form in all solvents. [2]