Dicarbonic acid esters

A new synthetic substrate (l,2 0-dilauryl-rac-glycero-3-glutaric acid-(4-methyl-resorufin)-ester), consisting of two glycerol ether and one ester bonds, has been proposed. LPS hydrolyze the latter bond in an alkaline medium to an unstable dicarbonic acid ester that spontaneously hydrolyzes to yield glutaric acid and methylresorufin this is a bluish-purple chromophore with peak absorption at 580 nm. 

Cassaday (1950), Shostakovski et al. (1951) and Melnikov et al. (1952) investigated extensively the addition reactions of dialkyl phosphorodithioic acids to unsaturated dicarbonic acid esters, and found that the dialkyl phosphorodithioic acids are added at the double bond in the same way as are mercaptans. This reaction was used by Cassaday (1950) who prepared 0,0-dimethyl-S-(l,2-dicarbethoxy)-ethyl phosphorodithioate by the addition reaction of dimethyl phosphorodithioic acid and maleic acid diethyl ester. This compound, known by the name malathion (89), became one of the most important phosphorus ester insecticides because of its low toxicity to warm-blooded animals. 

At elevated temperature, the azides 245 react with acetylenedicarbonic esters leading to 4,5-dicarbonic acid esters Dipolar additions to azide... 

Dicarbonic acid esters Monoperoxyoxalic acid esters... 

Pathway 2 is generally chosen in the academic literature. In addition to sodium naphthalene, dilithium compounds are often used [146-150]. The following terminators are described for the third pathway silicon tetrachloride and tintetrachloride dicarbonic acid ester [151], divinylbenzene [152], and polymers formed from divinylbenzene [153] containing numerous vinyl groups yielding star-shaped polymers. Block copolymers of styrene and butadiene or isoprene are synthesized commercially in large ranges. 

Pyrindoles s. Indolizines Pyrocarbonic acid esters s. Dicarbonic acid esters Pyrocatediol, protection of keto groups with - 16, 234 suppl. 27... 

Urethans from dicarbonic acid esters NH NCOOR... 

Dicarbonic acid esters Hydroxy-hydroperoxy-peroxides... 

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