Highly Efficient Photochemical Generation of a Triple Bond: Synthesis, Properties, and Photodecarbonylation of Cyclopropenones
作者:Andrei Poloukhtine、Vladimir V. Popik
DOI:10.1021/jo034869m
日期:2003.10.1
The latter then rapidly loses carbon monoxide to produce the ultimate acetylenic product. Despite their high photoreactivity, cyclopropenones were found to be thermally stable compounds with the exception of hydroxy- and methoxy-substituted cyclopropenones. The latter undergo rapid solvolysis in hydroxylic solvents even at room temperature. The application of this reaction to the in situ generation
General synthesis of cyclopropenones and their acetals
作者:Masahiko Isaka、Satoshi Ejiri、Eiichi Nakamura
DOI:10.1016/s0040-4020(01)88873-6
日期:——
Metalated cyclopropenone acetals 5 react with a variety of electrophiles, including alkyl halides, carbonylcompounds, vinyl iodides, vinyl triflates, and aryl iodides, to give substituted cyclopropenone acetals in high yield. Hydrolysis of the acetal under acidic conditions gives the corresponding cyclopropenone. The reaction sequence has realized an efficient synthesis of an antibiotic penitricin
The present invention generally relates to a method of treating plants or plant parts comprising the step of contacting said plants or plant parts with at least one composition comprising at least one double bond adducted cyclopropene compound.
3-carboxycyclopropene or cyclopropenone derivatives, react with 1-propanethiol to give alkylthiocyclopropanes. None of the cyclopropenes and cyclopropene derivatives investigated reacted with other aminoacid chemical probes. These overall results support that inhibition of desaturases by cyclopropene fatty acids is caused by reaction of the unsaturated moiety with a cysteine residue of the enzyme active site.
Under mild thermal conditions, a [3+3] cycloadditionreaction between an active methylene compound and a dipolar trimethylenemethane species, which is thermally generated from 2-methylenecyclopropanone acetal, provides a dihydropyran.