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Allene - an overview | ScienceDirect Topics Allene (Taylor, 1967) has two sp 2 hybridised carbons present at the two ends and the central carbon is sp hybridised The two cumulative pi bonds exist in planes perpendicular to each other, as shown in Fig 3 28
Recent advances in (4 + 3) cycloaddition of allenes The (4)-part (or (3)-part) could be from both diene and allene starting material Asymmetric catalytic (4 + 3) cycloaddition of allenes represents a convenient and powerful synthesis strategy for seven-membered heterocycles using chair catalysts and auxiliaries, offering a green and efficient synthesis
Allenoates in organic synthesis - ScienceDirect Allene's units are very important because of their presence in many of natural compounds (Fig 1) These compounds have many applications in the production of drugs and medicines with special roles Allenoates can play a key role in organic synthesis due to Lewis base catalysis and their various reactivities According to Fig 2, Lewis base addition to the electrophilic, sp-hybridized, β
Cloning of novel rice allene oxide cyclase - ScienceDirect The sequential action of allene oxide synthase (AOS) and cyclase (AOC), the first two committed genes in this pathway, gives rise to the JA precursor 12-oxo-phytodienoic acid (OPDA)
Allene-Oxide Cyclase - an overview | ScienceDirect Topics Allene oxide (77) is also a reactive intermediate with an unusual structure, characterized by an epoxide ring with an exocyclic carbon–carbon double bond Allene oxide cyclase and or spontaneous hydrolysis acts to form well-known jasmonic acid, α- and γ-ketols, and racemic 12-oxo- (10,15 Z)-phytodienoic acids, respectively [94–96]