L,4-Dichloro-but-2-ene ozonide

Other new ozonides include those of acenaphthylene and 3,4-di-chloro-3,4-dimethyl-cyclobut-l-ene. They are the cyclic analogs of cis-stilbene ozonide and l,4-dichloro-but-2-ene ozonide, respectively. Altogether, more than 45 ozonides were investigated. 

In the same way, the l,4-dichloro-but-2-ene ozonide with the shorter retention time on silica gel yielded fractions with [a]40o = —2.66° and +4.2° the ozonide of l,4-dibromo-2,3-dimethyl-but-2-ene, which only could be made in one form with a melting point of 42 °C, yielded fractions with [ ]330 = +50.7° and —39.2°. Both, therefore, have the trans configuration. It is remarkable that the trans ozonide in this case is the only product, even when pure cis-l,4-dibromo-2,3-dimethyl-but-2-ene is ozonized. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ ]

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