Urea, Phenyl

Miles and Moye [171] have shown that several classes of nitrogen containing pesticides responded to a high performance liquid chromatography post-column reaction detector that employed ultraviolet photolysis with optional reaction with o-phthalicdicarboxaldehyde-2-mercaptoethanol followed by fluorescence detection. It was applied to the determination of jV-methylcarbamates, carbamoyl oximes, carbamethoic acids, dithiocarbamates and phenyl ureas, phenyl amides and phenyl carbamates in groundwater. See also Table 4.3. 

Difenoconazole heterocyclic nitrogen, triazole Difenoxuron urea, phenyl ether Difenzoquat methyl sulphate heterocyclic nitrogen, pyrazole, quartenary ammonium Difethialone coumarin (similar)... 

Silafluofen silane, phenyl ether Simazine heterocyclic nitrogen, triazine Simetryn heterocyclic nitrogen, triazine Sulcofuron urea, phenyl ether Sulfentrazone heterocyclic nitrogen, triazole, sulfonamide... 

Pheneturide. N-. 1 mi noca rbonyi) -a -r thylbrnzene-acetamide (2-pkenylbutyryl)urea -phenyl-a-ethylacetyl-... 

Phenyl Thio UREA (Phenyl thio carbamide) CS.NHj.NHC,H,. Solubility in Water. 

Representative procedure for the gold-catalyzed intramolecular hydroamination of alkenyl ureas. Phenyl 2-methyl-N,4,4-triphenylpyrrolidine-l-carboxlamide ... 

Urea phenyl derivatives are used as polypropylene nucleating agerrls."" They give excellent crystallizability, high transmittance, high clarity, low haze, arrd irrrproved thermal stability.""... 

M.p. B.p. Picrate M.p. Acetyl deiiv. M.p. Benzoyl deriv. H.p. Benzene sulph. Onyl deriv. M.p. Toluene p-sulph> onyl deny. M.p. Phenyl urea deriv, M.p. 

Phenyl isocyanate is a colourless liquid, b.p. 164° or 55°/13 mm. its vapour is lacluymatory. The liquid reacts readily with water, yielding diphenyl urea, m.p. 241°, and hence must be protected from atmospheric moisture ... 

Benzene- sulphon- amlde /)-Tolu- enesul- phon- amlde Benzal Derivative Plcrate 3-Nltro- phthal- Imlde 2 4- Dinitro- phenyl Derivative Formyl Derivative Phenyl thio- urea... 

Condensation of 2-phenyl-4-amino-5-benzoylthiazole with urea yields thiazolo[4.5-d]pyrimidines 127 (Scheme 84) (49). 

Glipi de. GHpi2ide (l-cyclohexyl-3[ -[2-(5-methylpyra2inecarboxamido)eth5l]phenyl]sulfonyl]urea), mol wt 445.55, forms crystals from ethanol, mp 208—209°C. It is known commercially as Glucotrol. 

An excess of phosgene is used during the initial reaction of amine and phosgene to retard the formation of substituted ureas. Ureas are undesirable because they serve as a source for secondary product formation which adversely affects isocyanate stabiUty and performance. By-products, such as biurets (23) and triurets (24), are formed via the reaction of the labile hydrogens of the urea with excess isocyanate. Isocyanurates (25, R = phenyl, toluyl) may subsequendy be formed from the urea oligomers via ring closure. 

Although most nonionic organic chemicals are subject to low energy bonding mechanisms, sorption of phenyl- and other substituted-urea pesticides such as diuron to sod or sod components has been attributed to a variety of mechanisms, depending on the sorbent. The mechanisms include hydrophobic interactions, cation bridging, van der Waals forces, and charge-transfer complexes. 

Sulfation by sulfamic acid has been used ia the preparation of detergents from dodecyl, oleyl, and other higher alcohols. It is also used ia sulfating phenols and phenol—ethylene oxide condensation products. Secondary alcohols react ia the presence of an amide catalyst, eg, acetamide or urea (24). Pyridine has also been used. Tertiary alcohols do not react. Reactions with phenols yield phenyl ammonium sulfates. These reactions iaclude those of naphthols, cresol, anisole, anethole, pyrocatechol, and hydroquinone. Ammonium aryl sulfates are formed as iatermediates and sulfonates are formed by subsequent rearrangement (25,26). 

Other amino resins besides MF resins are used to a lesser degree in coatings. Urea—formaldehyde resins are used in some coatings for wood furniture because these resins cross-link at lower temperatures than MF resins and the higher water resistance and exterior durabiUty that can be obtained using MF resins are not needed. Ethers of formaldehyde derivatives of 6-phenyl-l,3,5-triazine-2,4-diamine [91-76-9] (benzoguanamine resins) give... 

When the aromatic aldehyde is omitted from a Biginelli reaction mixture, a dihydropyrimidine is still formed. Thus, for example, phenylacetaldehyde (2 mol) and urea (1 mol) react to give 4-benzyl-5-phenyl-3,4-dihydropyrimidin-2(li/)-one (676) (33JA3361). 

In contrast to the above additions A-allyl- and substituted A-allyl-amides, -urethanes, -ureas and -thioureas undergo intramolecular cyclization only in 6(3-96% sulfuric acid to give the corresponding oxazolinium and thiazolinium salts. Treatment of these cations with base yields 2-oxazolines and 2-thiazolines in moderate to good yields. The reaction is illustrated by the conversion of A-2-phenylallylacetamide (342) into 2,5-dimethyl-5-phenyl-2-oxazoline (343) in 70% yield 70JOC3768) (see also Chapter 4.19). 

Phenyl(o-nitrophenyl)methyl, 345 Urea-Type Derivatives... 

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