Two derivatives of N 6 -isopentenyladenine, 3 and 4, bearing either a vinylic fluorine atom or a trifluoromethyl group, were easily synthesized from known fluorinated precursors. Both derivatives 3 and 4 were found to be more active, as cytokinins, than the parent compounds zeatin ( 1 ) and N 6 -isopentenyladenine ( 2 ).
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Clemenceau et al. (1996) studied this question.
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