Carboxylic acid esters cycloalkanone

Bis[4-methoxyphenyl] dicyanomethylidene tellurium did not react with benzaldehyde3. Dibutyl ethoxyearbonylmethylidene tellurium and aliphatic aldehydes, aromatic aldehydes, cycloalkanones, dialkyl ketones, alkyl aryl ketones, and diphenyl ketone combine to yield a,/ -unsa turated carboxylic acid esters predominantly in the ( )-form4. Dibutyl cyanomethylidene and dibutyl benzoylmethylidene tellurium react similarly with benzal-dehydes and ketones5. 

Notable examples of general synthetic procedures in Volume 47 include the synthesis of aromatic aldehydes (from dichloro-methyl methyl ether), aliphatic aldehydes (from alkyl halides and trimethylamine oxide and by oxidation of alcohols using dimethyl sulfoxide, dicyclohexylcarbodiimide, and pyridinum trifluoro-acetate the latter method is particularly useful since the conditions are so mild), carbethoxycycloalkanones (from sodium hydride, diethyl carbonate, and the cycloalkanone), m-dialkylbenzenes (from the />-isomer by isomerization with hydrogen fluoride and boron trifluoride), and the deamination of amines (by conversion to the nitrosoamide and thermolysis to the ester). Other general methods are represented by the synthesis of 1 J-difluoroolefins (from sodium chlorodifluoroacetate, triphenyl phosphine, and an aldehyde or ketone), the nitration of aromatic rings (with ni-tronium tetrafluoroborate), the reductive methylation of aromatic nitro compounds (with formaldehyde and hydrogen), the synthesis of dialkyl ketones (from carboxylic acids and iron powder), and the preparation of 1-substituted cyclopropanols (from the condensation of a 1,3-dichloro-2-propanol derivative and ethyl-... 

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