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Aromaticity requirements for

Refinery average (ppmw) 1000 (maximum) 330 (<300ppm S and <29.2% aromatics required for national certification <850ppm S and <41.2% aromatics as national maximum) 30 30... [Pg.222]

A simple consequence of the Woodward—Hoffmann rules is that cycloadditions involving a total (4n + 2) electrons, if they are all suprafacial, are always allowed they must always involve an odd number of (4q + 2)s components. Such reactions are often referred to as having aromatic transition states because of the obvious link with the aromatic requirement for (4n + 2) electrons. Six is the most common (4n + 2) number, but there are also a few cycloadditions involving ten electrons. These are mostly diene + triene, that is,, 4, +, 6j cycloadditions. Here are a couple of examples. [Pg.894]

See other pages where Aromaticity requirements for is mentioned: [Pg.258]    [Pg.155]    [Pg.318]   
See also in sourсe #XX -- [ Pg.17 ]

See also in sourсe #XX -- [ Pg.17 ]

See also in sourсe #XX -- [ Pg.328 , Pg.329 , Pg.330 , Pg.934 , Pg.935 , Pg.936 ]

See also in sourсe #XX -- [ Pg.328 , Pg.329 , Pg.330 , Pg.934 , Pg.935 , Pg.936 ]



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Aromaticity, cycloheptatrienyl cation requirements for

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