R. L. N. Harris

SYNTHESIS AND PLANT GROWTH REGULATOR PROPERTIES OF C-o-CARBOXYPHENYL DERIVATIVES OF FIVE AND SIX MEMBERED HETEROCYCLES

Compounds related to the auxin transport inhibitor l-(2′carboxyphenyl)-3-phenylpropan-l,3-dione, in which the 3-diketone moiety has been replaced by five and six membered heterocyclic systems, are discussed. The syntheses of four pyrimidine analogues are described, three of which involve Vilsmeier type amideacid chloride intermediates in the formation of the heterocyclic ring. The growth regulating properties of these pyrimidine derivatives are compared with those of other heterocyclic analogues in terms of their ability to inhibit the geotropic response in cress seedling roots.