名称:
Electrochemical oxidation of tetramethyl esters of ?,?,?,?-alcaneteracarboxylic acids
摘要:
Cyclization of esters of butane-1,1,4,4-and pentane-1,1,5,5-tetracarboxylic acids during electrolysis in methanol in the presence of NaI produces, with a yield of 95%, the esters of cyclobutane-1,1,2,2-and cyclopentane-1,1,2,2-tetracarboxylic acids. Under similar conditions, esters of the highest alpha, alpha, omega, omega-alkanetetracarboxylic acids undergo iodation and hydroxymethylation due to electrical oxidation of methanol to formaldehyde. During electrotysis in methanol in the presence of NaOAc, the esters of alpha,alpha,omega,omega-alkanetetracarboxylic acids undergo effective hydroxymethylation, followed by cyclization into substituted five- and six-member lactones, or tetrahydrofurans when structurally possible.