A -phenyl carbamates

Phenylurea and A-phenyl-carbamate residues Apply sample solution, overspot with 7% methanolic potassium hydroxide, cover the start zone with a glass plate and heat to 170°C for 20 mm Primary arylamines are produced [41]... 

A-Ethyluretliane (Ethyl A-ethyl carbamate) An-Propylurethane. A-n-Butylurethane. A- ec.-Butylurethane A-Phenylurethane (Ethyl A-phenyl carbamate) Ethyl oxanilate... 

The release of phosgene and toxic solvent has stimulated the development of novel processes. The BASF process for MDI, that employs high temperatures and pressures to increase the rate of reaction, does not release phosgene. Catalytic routes, via oxidative carbonylation of aniline to methyl A-phenyl carbamate (12), using palladium metal... 

Fu, Z.H. Ono, Y. Synthesis of methyl A-phenyl carbamate by methoxycarbonylation of aniline with dimethyl carbonate using Pb compounds as catalysts. J. Mol. Catal. 1994, 91, 399-405. 

From a phenyl carbamate TMSCH2CH2OH, f-BuOK, THF, rt, 12h, 100% yield. The driving force for this reaction is the leaving group ability of the phenol. The reaction probably proceeds through an isocyanate. 

Heard and Suedee [40] reported the use of cellulose carbamates in stereoselective adsorption and membrane permeation of racemate and individual enantiomers of propranolol. In this study, three carbamates were used including cellulose tris A-(phenyl carbamate) (Ri) cellulose tris A-(3,5-dichlorophenyl carbamate) (R2) and cellulose tris A-(3,5-dimethyl-phenyl carbamate) (R3) (Fig. 4). The S-enantiomer of propranolol was found to be preferentially bound with all the three carbamates used in this study. Further, incubation at 32°C (pH 7.4) increased binding compared to room temperature. The dimethylphenyl carbamate derivative (R3) had the highest sterereoselective binding compared to the dichlorophenyl (R2) and phenyl (Ri) forms. The ratio R to S enantiomer flux values for Ri, R2, and R3 were 2.65, 2.31, and 1.35, respectively. In the control experiment with no carbamates, however, no stereoselective adsorption was observed. 

Synonyms Ban-Hoe Beet-Kleen Carbanilic acid isopropyl ester Chem-Hoe IFC IFK INPC IPC IsoPPC Isopropyl carbanilate Isopropyl carbanilic acid ester Isopropyl phenylcarbamate Isopropyl 7V-phenylurethane O-Isopropyl A -phenyl carbamate 1-Meth-ylethyl phenylcarbamate Ortho grass killer Phenylcarbamic acid 1-methylethyl ester 7V-Phenyl isopropylcarbamate Premalox Profam Prophame Triherbide Triherbide-IPC Tuberit Tuberite USAF D-9 Y 2. 

Another route, discovered by Meyer and Fory (2), involves the heating of a phenyl carbamate of the sulfonamide with the aminoheterocycle (Equation 3) to yield the desired sulfonylurea. 

Neomenthol in the inactive condition melts at 51, and forms a hydrogen phthalate melting at 177, and a phenyl-carbamate melting at 114. On oxidation it yields menthone, identical with that formed by the oxidation of menthol, thus proving that the two bodies are stereoisomers. By fractional crystallisation of brucine salt of the hydrogen phthalate, the dextro variety was obtained, whilst by similar treatment at the quinine salt of the hydrogen succinate f-neomenthol was obtained. The specific rotation of these optically active neomenthols is + 19 6. ... 

Table 2. Excess volume of cellulose tris(A-phenyl carbamate) (M = 150000 g/mol) in eyelohexanol (CeHizO) at r= 354.15 K [1975TAG1],...

Table 1. Partial specific volume of cellulose A-phenyl carbamate.

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