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Desorption, from nuclei

The next step is the fission of the bond between the aromatic nucleus and the alkyl group assistance of a basic site (surface oxygen atoms —O—, —O" or —OH) which takes the leaving proton from the Cp atom is very probable. The last step is the desorption of the arene. [Pg.317]

The four new cyclopeptide alkaloids (19a)—(19d) isolated from the shrub Ceanothus integerrimus contain a para-bridged fourteen-membered-ring nucleus (19), for which the name phencyclopeptine has been proposed.16 The crude alkaloidal extract from Ceanothus sanguineus17 showed the presence of five major components on composite field-desorption mass spectrometry. H.p.l.c., however, yielded six alkaloids, two of which were isomeric and one of which was a new alkaloid (20). The bark of Scutia buxifolia contains five scutianine alkaloids (B, C, D, E, and H) H is new, and is (21).18 Two new cyclopeptides, sativanines A and B, have been identified as (22) and (23) by m.s.-n.m.r. study.19... [Pg.241]

Uys J, Grey A, Wiggins A, Schwacke J, Schey K, Kalivas P (2010) Matrix-assisted laser desorption/ionization tissue profiling of secretoneurin in the nucleus accumbens shell from cocaine-sensitized rats. J Mass Spectrom 45 97-103. doi 10.1002/jms.l697... [Pg.415]

See other pages where Desorption, from nuclei is mentioned: [Pg.234]    [Pg.308]    [Pg.573]    [Pg.425]    [Pg.28]    [Pg.28]    [Pg.401]    [Pg.144]    [Pg.144]    [Pg.229]    [Pg.663]    [Pg.555]    [Pg.97]    [Pg.23]    [Pg.155]    [Pg.308]    [Pg.32]    [Pg.473]    [Pg.477]    [Pg.485]    [Pg.59]    [Pg.109]    [Pg.134]    [Pg.470]    [Pg.141]   
See also in sourсe #XX -- [ Pg.28 ]

See also in sourсe #XX -- [ Pg.28 ]



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