Reaction of 5,5'-(1,4-Phenylene)bis(3-aryl-2-oxaspiro[5.5]undec-3-en-1-ones) with Methyl 1-Bromocyclohexanecarboxylate and Zinc

Russian Journal of Organic Chemistry - The reaction of 3,3'-(1,4-phenylene)bis(1-phenylprop-2-en-1-ones) with the Reformatsky reagent obtained from methyl 1-bromocyclohexanecarboxylate and zinc...     

Reaction of alicyclic reformatsky reagents with 2,5-bis(arylmethylidene)cyclopentanones

Reformatsky reaction of methyl 1-bromocyclobutane-, 1-bromocyclopentane-, 1-bromocyclohexane-, and 1-bromocycloheptanecarboxylates with 2,5-bis(arylmethylidene)cyclopentanones gave the corresponding 4??-aryl-7??-arylmethylidene-4??,5??,6??,7??-tetrahydro-2??H-spiro[cycloalkane-1,3-cyclopenta[b]pyran]-2??-ones.     

Reactions of Ethyl 2-Amino-5-(2-aryl-2-oxoethylidene)- 4-oxo-4,5-dihydrofuran-3-carboxylates and 2-Amino-5-(2-aryl- 2-oxoethylidene)-4-oxo-4,5-dihydrofuran-3-carbonitriles with Alcohols

Ethyl 2-amino-5-(2-aryl-2-oxoethylidene)-4-oxo-1H-4,5-dihydrofuran-3-carboxylates and 2-amino- 5-(2-aryl-2-oxoethylidene)-4-oxo-1H-4,5-dihydrofuran-3-carbonitriles reacted with alcohols in the presence of a catalytic amount of concentrated aqueous HCl to give the corresponding 5-alkoxy-2-amino-5-(2-aryl-2- oxoethyl)-4-oxo-1H-4,5-dihydrofuran-3-carboxylic acid derivatives. A probable reaction mechanism was proposed on the basis B3LYP/6-311G(d) quantum chemical calculations.     

Study of reaction of reformatsky reagent prepared from methyl bromocyclopentanecarboxylate and zinc with 2-oxochromen-and 6-bromo-2-oxochromen-3-carboxylic acids <Emphasis Type="Italic">N</Emphasis>-arylamides

Reformatsky reagent prepared from methyl 1-bromocyclopentanecarboxylate and zinc reacted with 2-oxochromen-and 6-bromo-2-oxochromen-3-carboxylic acids N-arylamides yielding 3-aryl-1,1-tetramethylene-and 3-aryl-9-bromo-1,1-tetramethylene-2,3,4,4a,5,10b-hexahydro-1H-chromeno[3,4-c]pyridine-2,4,5-triones as single diastereomers.     

Spirocyclohexadienones. 4. Synthesis and dienone-phenolic rearrangement of 1-R-3,3-dialkyl-2-azaspiro[4.5]deca-1,6,9-trien-8-ones

The reactions of 1-(p-methoxyphenyl)-2-methylpropan-1-ol or -cyclohexyl-p-methoxybenzyl alcohol with nitriles RCN in concentrated sulfuric acid afforded 1-R-3,3-dialkyl-2-azaspiro[4.5]deca-1,6,9-trien-8-ones. The stability of the latter toward the dienone-phenolic rearrangement depends on the nature of the substituent R. The reaction mechanism was studied by the semiempirical quantum-chemical AM1 method.     

Effect of the cationic composition of cryolite-alumina melts on the anodic overvoltage

Steady-state polarization of anodes prepared from platinum or glassy carbon is studied in a laboratory cell in a cryolite-alumina melt containing small amounts of potassium and lithium fluorides and various alumina amounts. The surface area of the anodes reaches a few centimeters squared. An insignificant depolarization of the anodic process is discovered following the replacement of a fraction of sodium ions in the electrolyte by potassium ions in an amount of ～3.9 mol % KF (～4.1 wt %) and a noticeable depolarization, following the substitution of K⁺ in an amount of ～7.1 mol % KF (～7.6 wt %). Substituting lithium ions in an amount of ～3.7 mol % LiF (～1.8 wt %) for a fraction of sodium ions leads to an insignificant polarization. A significant effect of a general cryolite ratio on polarization is discovered. A noticeable increase in the anodic polarization is fixed at an alumina concentration equal to 5–5.5 wt %.     

Synthesis of 5-R-3-Diphenylmethylene-2,3-dihydro-2-furanones from 5-Substituted 2,3-Dihydro-2,3-furandiones and Phenylbenzoyldiazomethane

3-Reactions of 5-aryl, 5-heteryl, and 5-styryl-2,3-dihydro-2,3-furandiones with phenylbenzoyldiazomethane gave rise to 5-substituted 3-dipenylmethylene-2,3-dihydro2-furanones. The possible intermediates and reaction products were investigated by semiempirical SCF MO LCAO method in AM1 approximation.