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Hydrogenation isocyclics

Chlorophyll a (L.P. Vernon, 1966) contains an unsymmetrical porphyrin chromophore with two special features the double bond between C-17 and C-18 is hydrogenated and carhon atoms 13 and 15 hear a carboxylated, isocyclic cyclopentanone ting E. [Pg.257]

The reactions in Methods A, B and C, which all start from pyrylium salts are analogous to the well-known conversions of 2.4.6-substituted pyrylium salts 27 with ammonia, primary amines, hydrogen sulfide or the anions of CH activated compounds to the corresponding heterocyclic or isocyclic aromatic systems The first step involves addition of the basic phosphine at C-2 (or C-6) to form 2S. Ring-opening, ring-closure and elimination of water are likely steps in the formation of the product 2. [Pg.21]

Lithiumfliq, ammonia/ferric chloride Partial hydrogenation of isocyclics... [Pg.28]

LithiumJliq. ammonia-sodium hydride Partial hydrogenation of isocycles with phenol ring retention... [Pg.27]

Hydrogen peroxide sodium hydroxide Oxidative cleavage of a,/ -ethyIeneketones Ring opening of isocycles... [Pg.371]

Ozone/sodium hydrogen sulfite Oxidative opening of isocycles... [Pg.57]

Nuclei s. Heterocyclics, Isocyclics, Rings Nucleophiles (s. a. G-Hydrogen, active)... [Pg.263]

Hydrogen peroxide acetic acid Oxidative opening of isocycles C... [Pg.338]

Palladium-carhonl acetic acid Hydrogenation of isocycles in N-heterocyclics... [Pg.40]

Hydrogen bromide acetic acid Rearrangement of 0-heterocyclics to isocyclics... [Pg.234]

Palladium-calcium carbonate/quinoline Hydrogenation of acetylene derivatives partial and selective s. 16, 80 Palladium-strontium carbonate Partial ring hydrogenation of isocyclics s. 17, 89... [Pg.418]

Hydrogen bromide/acetic acid Isocyclics from ketimines... [Pg.655]

Hydrogen chloride/acetic acid Isocyclics from ketones... [Pg.203]

N-nitrosourethans 17, 342 urethans 17, 342 Nitrous acid esters s. Alkyl nitrite Nitryl chloride 16,520 1 Nonanol as solvent 16, 728 Nuclei s. Heterocyclics, Isocyclics, Rings Nucleophiles (s. a. C-Hydrogen, active)... [Pg.241]

Palladium-curb on/ acetic acid Selective hydrogenation of isocycles in N-heterocyclics with retention of nitro groups... [Pg.292]

Stereospecific hydrogenation of isocyclics Ketones from a, -ethyleneketones... [Pg.323]

Hydrogen peroxide sulfuric acid Oxidative ring contraction of isocyclics Oxidative rearrangements of -diketones... [Pg.514]

Hydrogen chloride Skeletal rearrangement of isocyclics by intramolecular retroaldol-aldol condensation Cleavage of ketals... [Pg.242]

See other pages where Hydrogenation isocyclics is mentioned: [Pg.173]    [Pg.27]    [Pg.106]    [Pg.173]    [Pg.449]    [Pg.173]    [Pg.6]    [Pg.291]    [Pg.27]    [Pg.324]    [Pg.324]    [Pg.37]    [Pg.314]    [Pg.37]    [Pg.415]    [Pg.417]    [Pg.419]    [Pg.289]    [Pg.291]    [Pg.248]    [Pg.296]    [Pg.365]    [Pg.320]    [Pg.28]    [Pg.329]    [Pg.26]   
See also in sourсe #XX -- [ Pg.24 , Pg.58 ]

See also in sourсe #XX -- [ Pg.22 , Pg.49 ]



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Isocycles

Isocyclics, isocycles

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