Carboxylic anhydrides

chemical compound

chemical compound

the acid anhydride of maleic acid

any chemical compound having two acyl groups bonded to the same oxygen atom

Cantharidin is an odorless, colorless fatty substance of the terpenoid class, which is secreted by many species of blister beetles. Its main current use in pharmacology is treating molluscum contagiosum and warts topically. It is a burn agent, poisonous in large doses. It has been historically used as an aphrodisiac (in preparations sold under the name "Spanish fly"). In its natural form, cantharidin is secreted by the male blister beetle, and given to the female as a copulatory gift during mating. Afterwards, the female beetle covers her eggs with it as a defense against predators.

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chemical compound

chemical compound

chemical compound

chemical compound

chemical compound

The chemical compound 1,3,5-trioxanetrione, or 1,3,5-trioxacyclohexane-2,4,6-trione is an unstable oxide of carbon with formula CO. It can be considered a cyclic trimer of carbon dioxide (CO) or as a triple ketone of 1,3,5-trioxane (1,3,5-trioxacyclohexane). Trioxanetrione has been synthesized but is exceedingly unstable, with a half-life of approximately 40 min at −40 °C. It decomposes to give carbon dioxide.

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Tautomycin is a chemical that occurs naturally in shellfish and is produced by the bacterium Streptomyces spiroverticillatus. It is a polyketide-based structure characterized by a three hydroxyl groups, two ketones, a dialkylmaleic anhydride, an ester linkage (connecting anhydride unit to polyketide chain), a spiroketal and one methyl ether among others.

chemical compound

thumb|right|upright|General chemical structure of fulgides in the uncyclized form. In order to cyclize, at least one of the four R groups must be an aryl group. In organic chemistry, a fulgide is any of a class of photochromic compounds consisting of a bismethylene-succinic anhydride core that has an aromatic group as a substituent. The highly conjugated system is a good chromophore. It can undergo reversible photoisomerization induced by ultraviolet light, converting between the E and Z isomers, both of which are typically colorless compounds. Unlike the more-stable Z isomer, the E isomer can

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chemical compound

chemical compound