Now showing items 1-10 of 126
Chemical basis for the phytotoxicity of N-aryl hydroxamic acids and acetanilide analogues
(Verlag der Zeitschrift fur Naturforschung, 2008)
Germination inhibition activity of N-aryl hydroxamic acids and acetanilide analogues was measured on lettuce seeds (Lactuca sativa). Lipophilicity of the compounds was determined by HPLC. A correlation between lipophilicity ...
The mechanism of dephosphorylation of bis(2,4-dinitrophenyl) phosphate in mixed micelles of cationic surfactants and lauryl hydroxamic acid
(Figure Presented) Mixed micelles of cetyltrimethylammonium bromide (CTABr) or dodecyltrimethylammonium bromide (DTABr) and the α-nucleophile, lauryl hydroxamic acid (LHA) accelerate dephosphorylation of bis(2,4-dinitrophenyl) ...
Hydroxamic acid content of perennial triticeae
Ninety-four accessions of perennial Triticeae were examined for content of the hydroxamic acids DIBOA and DIMBOA. Levels of DIBOA (up to 44 mmolkg-1 fr. wt) were higher than those of DIMBOA (up to 4.5 mmol kg-1 fr.wt). The ...
Chemical Basis for the Antifeedant Activity of Natural Hydroxamic Acids and Related Compounds
Natural hydroxamic acids and related compounds derived from the 1,4-benzoxazin-3-one structure show antifeedant activity against the aphid Rhopalosiphum padi. This antifeeding activity is based on the electrophilic character ...
Hydroxamic acids (4-hydroxy-1,4-benzoxazin-3-ones), defence chemicals in the gramineae
Hydroxamic acids of the type 4-hydroxy-1,4-benzoxazm-3-ones constitute one of the most extensively studied secondary metabolites m relation to host plant resistance to pests and diseases They play a maJor role in the defence ...
Hydroxamic acids accumulation by wheat callus
Hydroxamic acids were quantified by HPLC in leaves of one-week-old seedlings and in 30 day-old callus tissues of four wheat cultivars. Leaves accumulated preferentially 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA). ...
Frontier orbitals and ir frequencies of cyclic hydroxamic acids related to antimicrobial activity
(Sociedad Chilena de Quimica, 2001)
HOMO and LUMO energies from a 6-31G** full geometry optimization of a series of 7 cyclic hydroxamic acid derivatives were calculated. According to the LUMO energy, the molecules can be classified as hard electrophiles ...
Antialgal and antifungal activity of natural hydroxamic acids and related compounds
(American Chemical Society, 1996)
Natural hydroxamic acids and related compounds derived from 1,4-benzoxazin-3-one structures inhibited the growth of the alga Chlorella xanthella and the fungus Candida albicans. On the basis of structure-activity relationships ...
Hydroxamic acids derived from 2-hydroxy-2h-1,4-benzoxazin-3(4h)-one: Key defense chemicals of cereals
Many cereals accumulate hydroxamic acids derived from 2-hydroxy-2H-1,4- benzoxazin-3(4H)-one. These benzoxazinoid hydroxamic acids are involved in defense of maize against various lepidopteran pests, most notably the ...
FRONTIER ORBITALS AND IR FREQUENCIES OF CYCLIC HYDROXAMIC ACIDS RELATED TO ANTIMICROBIAL ACTIVITY
(Sociedad Chilena de Química, 2001)