Ethylene diisocyanate

This intermediate for the preparation of ethylene diisocyanate exploded violently during isolation [1], Previously the almost dry solid had exploded violently on stirring with a spatula [2]. 

Decomposes in acids releasing carbon disulfide. In oxygenated waters, mancozeb degraded to ethylene thiuram monosulfide, ethylene diisocyanate, ethylene thiourea, ethylenediamine, and sulfur (Worthing and fiance, 1991). 

Agency for Toxic Substances and disease Registry (ASTDR) Toxicological Profile for Hexam-ethylene Diisocyanate, 157pp. US Department of Health and Human Services, Public Health Service, 1998... 

When PU is based on more volatile diisocyanates than MDI, snch as HDl (hexam-ethylene diisocyanate) or TDl (tolnene diisocyanate), these componnds spoil the gasoline or diesel oil boiling fraction of the pyrolysis oil, respectively. It is possible to eliminate the reactive and toxic diisocyanate products from the pyrolysis oil, either in a lower-temperature pyrolysis step or with the help of an adsorbent [41],... 

Ethylene diisocyanate reacts with active-hydrogen compounds to form 1-substituted 2-imidazolidones in high yield. The order of reactivity is R2NH > RNH2 > ROH > RSH in the last case, catalysis by DABCO ( triethylenediamine ) is required. 

Since BAMO polymer is a solid at room temperature, it is copolymerized with tetrahydrofuran (THF) in order to form a liquid BAMO copolymer. The terminal OH groups of BAMO-THF copolymer are cured with the NCO groups of hexam-ethylene diisocyanate (HMDI) and crosslinked with trimethylolpropane (TMP). The energy density of BAMO copolymer is defined as the energy contained within the unit mass of BAMO copolymer. The physicochemical properties of BAMO copolymer are shown in Table 4-1 l 15l... 

A soln. of aniline in benzene added to ethylene diisocyanate in the same solvent, and refluxed 3 hrs. product. Y 80%. — The ease of reaction appears to be in the order R2NH>RNH2>ROH>RSH with the mercaptan reaction requiring catalysis by triethylenediamine. F. reactions of ethylene diisocyanate with active hydrogen compounds s. J. N. Tilley and A. A. R. Sayigh, J. Org. Ghem. 29,3347 (1964). 

The preparation of aliphatic diisocyanates, using bisacylazides, has to be conducted with caution because an explosion occurred in the preparation of ethylene diisocyanate by using this method (13). Ethylene diisocyanate is readily obtained by dehydrochlorination of a heterocyclic allophanoyl chloride derivative obtained in the phosgenation of ethyleneurea (14). 

Ethylene diisocyanate, which is formed by rearrangement of succinyl diazide, can be hydrolyzed to ethylenediamine with ethanol it gives an imidazolidone (VI) instead of a normal urethan, but the imidazoli-done can be hydrolyaed readily to ethylenediamine. ... 

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