Reactions with Alcohols and Phenols

Oxidation of ethylene in alcohol with PdCl2 in the presence of a base gives acetal and vinyl ether. Reaction of terminal alkenes in alcohols affords regioisomers of the acetals 44 and 45 and vinyl ethers 46 depending on the structure of the alkenes. Internal alkenes 47 and alcohols give allylic ethers 48 and 50 and vinyl ethers 49 and 51 depending on which hydrogen is eliminated. [Pg.35]

Oxidation of terminal alkenes bearing an EWG in alcohols or ethylene glycol affords acetals of aldehydes chemoselectively. 3,3-Dimethoxypropioiutrile (53) is produced commercially in MeOH from acrylonitrile by use of methyl lutrite (52) as [Pg.35]

Pd(OAc)2-catalyzed cyclization of 56 gave the tetrahydrofurans 57 and 58 using molecular oxygen as reoxidant in DMSO [32], Formation of the oxazole 60 from [Pg.36]

59 was carried out with a catalytic amount of Pd(OAc 2 in DMSO under oxygen (1 atm) [6]. [Pg.37]

A phenolic oxygen participates in facile oxypalladation [16], Different chemos-electivity is observed depending on the catalytic species. The 2H-l-benzopyran 66 was formed cleanly from 2-allylphenol (65) by endo cyclization with Pd2(dba)3 or [Pg.37]

Bis(2,2,2-trifluoroethyl)]phosphite can be used to prepaie esters of phos phorous acid by a transestenfication reaction with alcohols and phenols [750] (equation 78)... [Pg.970]

By reactions with alcohols and phenols in the presence of base 338... [Pg.335]

Substituted o-benzenesulfonamide 61 was found to be a good source for the synthesis of 4-methoxybenzyl esters by the reaction with alcohols and phenols in the presence of sodium hydride at room temperature <1998TL1799>. Treatment of cyclic sulfonamide 61 with aqueous KOH in dimethylformamide (DMF) yielded 4-methoxybenzyl alcohol together with benzenesulfonamide 53 (Scheme 5). [Pg.50]

The formation of ketene intermediates facilitates the carbodiimide mediated esterification reaction with alcohols and phenols when carboxylic acids with an electron withdrawing group in the a-position are used as substrates. ... [Pg.114]

Reaction with alcohols and phenols (used by Union Carbide Corporation, India, to produce carbaryl pesticide) ... [Pg.296]

All mentioned polymeric oxides, alkoxides, aroxides and carboxylates are intensely coloured and insoluble in organic solvents. The structures were estimated by elementary analysis, IR spectra and model reactions. The mechanism of the reactions with alcohols and phenols is described as nucleophilic substitution at the metal atom for alonium and gennonhun ions ... [Pg.87]

Reaction with alcohols and phenols. Horner and co-workers introduced use of the reagents for the preparation of alkyl and aryl halides from alcohols or phenols, and Wiley and co-workers established that the reagents have considerable advantage over phosphorus pentahalides in the C—OH—C—X conversion and discussed the mechanism. For the preparation of n-butyl bromide the Wiley group added bromine under nitrogen to a solution of n-butanol and triphenylphosphine in dimethyl-formamide until 2 drops persisted in giving the solution an orange tint. Volatile... [Pg.1357]

By reactions with alcohols and phenols in the presence of base 15 J.2.2.3 By reactions with alkali metal alkoxides and phenoxides... [Pg.981]

Reaction with Alcohols and Phenols. The reaction of alcohols and phenols with triflic anhydride (Tf20) at 0°C in the presence of a base (usually Pyridine) in an inert solvent (usually dichloromethane) for 2-24 h affords the corresponding reactive trifluoromethanesulfonate esters (triflates). When triflic anhydride and pyridine are combined, the pyridinium salt forms immediately and normally precipitates out from the reaction mixture. Nevertheless, the salt is an effective esterifying agent, reacting with the added alcohol to give triflates in high yields (eq 1). ... [Pg.507]

Reaction with Alcohols and Phenols. Reaction of alcohols with triflic anhydride in the presence of a base affords the corresponding alkyl triflate, a versatile intermediate that can be used to generate an allylic carbocation in a [4+3] cycloaddition (91). ... [Pg.518]

It is used to produce phosphate esters by reaction with alcohols and phenols, acid chlorides, dyes as triphenyl methane. [Pg.167]

Reaction with Alcohols and Phenols. The reaction of alcohols with terminal alkenes affords acetals of ketones (eq 9). An elegant application of the reaction was a brevicomin synthesis (eq 10). ... [Pg.500]

The uranium(IV) compounds Cp2U(NEt2)2 and Cp3U(NEt2) undergo U-N bond cleavage reactions with alcohols and phenols ... [Pg.287]

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