Diphenyl dimethylacetamide

When diphenyl tellurium bis[trichloroacetale] was refluxed in dichloromethane with 4-methylpyridine, tetramethylpiperidine, or dimethylacetamide, 1 1 adducts of diphenyl tellurium dichloride with these ligands were isolated4. 

Zolotukhin et al. have prepared the macrocyclic poly(arylene thioether ketone) 113 to study ring-opening polymerization <2004MM2041>. Compound 113 was prepared by the reaction of 4,4 -bis(4"-fluorobenzoyl)diphenyl ether with 4,4 -thiodiphenol in iV,iV-dimethylacetamide under a high dilution condition in a poor 9% yield. Structure of 113 was confirmed by X-ray analysis. 

Dicyclohexy Icarbod iimide p-Toluenesulfonic Acid Phenyl Chloroformate Sodium Hydroxide Ethyl Chloroformate Sodium Carbonate Diphenyl Carbonate Benzyl Bromide iV,A-Dimethylacetamide Benzyl Chloride Acetonitrile Sodium Borohydride Trifluoroacetic Acid Hydrogen Cyanide Sodium Cyanide Sodium Bisulfite... 

Diphenyl-l,3,5-pentanetrione (45) with 1 equivalent of N,N-dimethylacetamide dimethyl acetal (DMADMA) yielded 5-benzoyl-2-phenil-6-methyl-4-pyranone (49). Pyranone 49 with DMFDMA yielded 50, which was converted to 2,5-diphenyl-lH,4H-pyrido[4,3- 7]pyrane-4-one (51) by cyclization of compound 50 with aqueous ammonia. This reaction was performed in DMF at 80 °C and the product precipitated from the mixture (Scheme 19). 

The O-arylation of appropriate phenols using symmetrical iodonium salts has been employed in the synthesis of hydroxylated and methoxylated polybrominated diphenyl ethers, some of which are related to natural products [872,873]. For example, several polybrominated diphenyl ethers 680 have been prepared by the reaction of iodonium salt 678 with phenols 679 in iV,iV-dimethylacetamide (DMAC) solution in the presence of base (Scheme 3.272) [872]. 

A soln. of N,N-dimethylacetamide in acetonitrile containing LiC104 oxidized at a Pt-electrode under argon and anhydrous conditions, then 1,1-diphenylethylene added -> 6,6-diphenyl-2,3-dimethyl-5,6-dihydrooxazinium perchlorate. Y 58%. F. e., also phosphonium salts, s. M. Genies, Bl. 1975, 389. 

The basic patent describes the synthesis of PY 138 by reaction of 1 molecule of 8-aminoquinaldine (10) with twice the stoichiometric amount of tetrachlorophthalic anhydride (11) in an inert solvent in the presence of zinc chloride (Figure 19-2). Suitable solvents include halogenated hydrocarbons, diphenyl, diphenylether or mixtures of these substances, high boiling alcohols, N-alkylpyrrolidone, dimethylfor-mamide, dimethylacetamide or benzoic acid l... 

---