1 -Phenyl-1 -hydroxy-3-methyl urea

The main difference between the pathways depicted in Figure 7 is the involvement of the carboxyl function in the formation of the resonance-stabilized structures susceptible to further reaction. If the carboxyl function at the 1 -position is indeed important in the conversion of hydroxylaminoaromatic compounds to catechols, this might explain why catechol formation has only been found from 4-hydroxylaminobenzoate (20, 26, 51) and not from hydroxylami-nobenzene (41), 1-hydroxy-1-phenyl-3-methyl urea (62), 1-chloro-4-hydroxylaminobenzene (13) and hydroxylaminobiphenyls (7). These hydroxylaminoaromatic compounds, lacking a carboxyl function at the 1-position, were converted to the corresponding aminophenols. 

Hydroxy phenyl) -1,1 -dimethylurea. see Monuron 3 - (4 - Hydroxy phenyl) -1 -formyl-1 -methyl urea. see Monuron... 

Electron beam irradiation was used for grafting of JV-phenyl-(3-amino-6-methyl-JV-allyloxycarbonyl)-JV -phenyl-(4-phenylamino)urea or JV-phenyl[3-amino-6-methyl-JV- (2-acryloyloxyethoxycarbonyl)]-jV -phenyl- (4-phenylamino)urea onto HOPE [229]. y-Radiation induced grafting of 2-hydroxy-4-(3-methacryloyloxy-2-hydroxypropoxy)benzophenone onto LDPE, HOPE or PP was performed in an air-free atmosphere and in the presence of cupric chloride (to prevent homopolymerization). Foils with chromophores located near the surface were formed [218]. 

Quinoxaline 1-oxide (209) reacts with phenyl isocyanate to give 2-anilinoquinoxaline (210) together with 1,3-diphenyl-l-(2-quinoxalinyl)-urea (211) and cyclized oxidation product of the urea 212.215 2-Quinoxalinone 4-oxide (205) and its 1-methyl derivative undergo addition reactions, e.g., with phenyl isocyanate and benzyne to give compounds 214 and 216, respectively.216 These reactions are formulated as proceeding via the intermediate cycloadducts 213 and 215. Compound 216 has also been obtained by photolysis of 3-(o-hydroxy-phenyl)quinoxaline 1-oxide.51 1,3-Dipolar cycloaddition of quinoxaline... 

Methylitalidipyron. 3,3 -[[2,4,6-Trihydroxy-5-(2-methyl-l-oxopropyl)-l,3-phenylene]-bis(methylene)]bis[6-ethyl-4-hydroxy-5-methyl-2H-pyran-2-one, 2061 MIV 150. N-(5-Cyano-2-pyridinyl)-N -[(lS,2S)-2-[6-fluoro-2-hydroxy-3-( 1-oxopropyl) phenyl]-cyclopropyl]-urea, 1950... 

FDA and urea for few hours [179, 180]. Some of the NLO chromophores [179, 180] used in this method are 2-[3-(2- 4-[bis-(2-hydroxy-ethyl)-amino]-phenyl -vinyl)-5,5-dimethyl-cyclohex-2-enylidene]-malononitrile [179], 4-[N,N-bis(hydroxyethyl)amino]-4 -nitrostilbene [179], 4-[N,N-bis(hydroxyethyl)amino]-4 -nitroazobenzene [179], 4-[N,N-bis(hydroxyethyl)amino]-2 -methyl-4 -nitroazobenzene [179], 4-[N,N-bis (hydroxyethyl) amino]-4 -cyanoazobenzene [179],4-[N,N-bis(hydroxyethyl)amino]-4 -formylazobenzene [180] and 2-[[4-(4-[l,3]dioxolan-2-yl-phenylazo)-phenyl]-(2-hydroxy-ethyl)-amino]-ethanol [180] and their chemical structures are given in figure 34. 

---