Phenols fluoro

Fluoro-x-iX-dinitropbenol, pltlts (from water), mp 72—74° was prepd by nitrating 3 fluoro-phenol with mixed nitric-sulfuric acid (Ref 5). It forms a yel K salt... 

Chloro 4 fluoro phenol flumiclorac 2 Chloro 4 fluoro 5 nitrophenol flumiclorac 1 Chloro 2 methoxy ethylene cloetocarb... 

Obtained by Riedel-Crafts acylation of m-fluoro-phenol with m-nitrobenzoyl chloride in ethylene dichloride in the presence of aluminium chloride atr.L fOT 4 h(gaieral procedure Qcanpound 33 i). 

Also obtained by reaction of acetyl chloride with 4-fluoro-phenol in the presence of aluminium chloride, first at r.t. for 30 min, then at 130° for 2 h (89%) [3907]. 

Poly- propylene poly- ethylene CAB" ABSf PVC Saran Polyester glass 1 Epoxy glass phenolic asbestos Fluoro- carbons Chlorinated polyether (Penton) Poly- carbonate... 

Huonnations with DAST proceed with high chemoselectivity In general, under very mild reaction conditions usually required for the replacement of hydroxyl groups, other functional groups, including phenolic hydroxyl groups [112], remain intact This provides a method for selective conversion of hydroxy esters [95 97] (Table 6), hydroxy ketones [120, 121], hydroxy lactones [722, 123], hydroxy lactams [124] and hydroxy nitriles [725] into fluoro esters, fluoro ketones, fluoro lactones, fluoro lactams, and fluoro nitnles, respectively (equations 60-63)... 

A proposed mechanism for silyl ether displacement is shown in Scheme 6.14. In the first step, the fluoride anion converts the trimethyl siloxy group into a phe-nolate salt. In the following step, the phenolate anion attacks the activated fluoro monomer to generate an ether bond. The amount of catalyst required is about 0.1-0.3 mol%. Catalyst type and concentration are crucial for this reaction. 

Thus, perfluoroalkylated imidazoles are obtained in excellent to good yields (Scheme 3.7) [16, 17]. Similarly, a hindered phenolate anion provides a fluoro-alkylated dimeric product in high yield (Scheme 3.8) [173. 

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