435 research outputs found

    Zinc chloride catalyzed addition reactions of propargyl chlorides with acyclic 1,3-dienes

    Get PDF

    Diastereoselective synthesis of ő≤- and ő≥2-muurolene. A carbocationic pathway from mono- to sesquiterpenes

    Get PDF
    The Lewis acid catalysed addition of the piperityl chlorides 6 to isoprene yields adduct 7, which undergoes a cis-stereoselective cyclisation to give the diastereoisomeric muurolene monohydrochlorides 8. Treatment with potassium tert-butoxide affords ő≤- and ő≥2- muurolene 2

    [2+2]-cycloadditions of alkenes with the triphenylallenyl cation

    Get PDF
    The triphenylallenyl cation (8), generated from triphenylpropynol (7) and FSO3H, reacts with alkenes to give the allyl cations 12, which may be deprotonated to yield the methyleneccylobutenes 14. Alternatively, 12 can be converted into the 2-vinyl-indenes 13 two subsequent electrocyclic reactions

    Addition and cycloaddition reactions of allenyl cations with various cycloalka-1,3-dienes

    Get PDF
    Allenyl cations , generated from propargyl chlorides and zinc chloride give monocyclic adducts or [3+4] and [2+4] cycloaddition products with various cycloalka-1,3-dienes. The mode of addition depends on R and the ring size of the 1,3-dienes
    • ‚Ķ
    corecore