[Phytotoxic activity of N,N-di-sec-butylbenzamides with alkyl substituents on the aromatic nucleus]. / Sull'attivita fitotossica di N,N-di,sec.butilbenzamidi alchilsostituite al nucleo aromatico.

A new series of N,N-di,sec.butylalkylbenzamides was studied and it was found that some compounds showed particularly interesting selective phytotoxicity comparable with that shown by analogous halogen derivatives.

[Preparation and study of the phytotoxic activity of arylalkylamides. II. N-Phenethylamides]. / Preparazione e studio dell'attività fitotossica di amidi n-aralchilsostituite. Nota II--N-fenetilamidi.

A series of N-phenetylamides was prepared and tested for phytotoxic activity. Comparison with N-benzylamides showed that lengthening the alkyl chain in the aralkylamide residue reduces phytotoxicity and that, also in the case of phenetylamides, phytotoxic activity is not due to inhibition of the Hill reaction.

[Asymmetric chlorobenzoic acid N,N-dialkylamides having phytotoxic activity]. / N,N-Dialchilamidi asimmetriche dell'acido 3-clorobenzoico, ad attività fitotossica.

In continuation of research on phytotoxic substances with selective activity, pre- and post-emergence tests against some weed species were made using a series of 3-chlorobenzamides substituted on the amide nitrogen with a sec.butyl or a 1-methylbutyl group, the second alkyl substituent being linear, branched, saturated or unsaturated. Asymmetric 3-chlorobenzamides with a tert.butyl in place of sec.butyl or with an 1-ethylpropyl in place of 1-methylbutyl and with a second alkyl residue of different nature and with variable weight, were prepared and tested for the purposes of comparison. The results show that amides with excellent phytotoxicity and selectivity of action are obtained if a sec.butyl, 1-methylbutyl or 1-ethylpropyl group is retained and the second substituent on the amide nitrogen is suitably varied. The results give further information on the importance of the steric characteristics of the substituents on nitrogen in the phytotoxic N,N-dialkylamides.

[Preparation and study of phytotoxicity of N-arylalkyl substituted amides. I. Benzylamides]. / Preparazione e studio dell'attività fitotossica di amidi N-aralchilsostituite. Nota I - Benzilamidi.

A series of N-benzyl substituted amides (substances I-CV) have been prepared and tested for phytotoxicity. Preliminary tests were carried out on various common plants using both pre- and post-emergence tests at doses of 6 kg/ha. Further tests using doses of 4 and 2 kg/ha were carried out on the most interesting compounds. Some of the compounds tested showed marked phytotoxic activity. This activity appears clearly different as regards mechanism from that of homologous anilides. The amides studied appear to be quite inactive as inhibitors of the Hill reaction.

[Preparation and study of phytotoxic activity of anilides of the (+/-) hydratropic acid]. / Preparazione e studio dell'attività fitotossica di anilidi dell'ac. (+/-)-idratropico

A series of ((+/-)-hydratropanilides variously substituted in the aniline nucleus (substances I leads to XXXIX) were prepared. The substances were studied for inhibition of the Hill reaction and for phytotoxicity. Comparison of the results of in vitro and in vivo tests did not often show strict correlation of data: in particular it seems probable that in the hydratropanilide series substances active on the isolated chloroplast are hindered in vivo in the absorption and transport phases and thus cannot reach the receptor sites.