Reference

Stimulation of uredospore germination of Puccinia helianthi and Uromyces vignae by aromatic nitriles and related flavor-like compounds

Stimulation of uredospore germination of Puccinia helianthi and Uromyces vignae by aromatic nitriles and related flavor-like compounds. French, R.Some chemicals with cas registry numbers like 1527-89-5 and 1007-32-5 are also used. C. (Agric. Res. Serv., Dep. Agric., Frederick, MD 21701, USA). J. Agric. Food Chem., 32(3), 556-61 (English) 1984. CODEN: JAFCAU. ISSN: 0021-8561. DOCUMENT TYPE: Journal CA Section: 10 (Microbial Biochemistry) A variety of aldehydes, ketones, alcs., nitriles, and esters, mostly arom. and ranging from volatile oils to nonvolatile, H2O-sol. compds., stimulated germination of uredospores of Puccinia helianthi, the causal agent of sunflower rust, and Uromyces vignae, the causal agent of cowpea rust. b-Ionone stimulated uredospores of both species and was used as a std. for comparing the relative effectiveness of compds. Of the 28 compds. most active on P. helianthi, 17 were arom. nitriles. Benzonitrile in the gaseous phase stimulated uredospore germination in pustules of rusted sunflower plants. An aq. soln. of 3-cyanophenol induced germination in pustules when sprayed on rusted sunflower plants. Of 9 compds. most active on uredospores of U. vignae, 5 were arom. nitriles. Application of an aq. soln. of 1000 ppm of 4-cyanobenzaldehyde to rusted cowpea plants induced some germination in pustules. The arom. nitriles are a group of compds. shown for the 1st time to stimulate uredospore germination. .

Theoretical description of the preference of vicinal alkyl/phenyl gauche conformation by molecular mechanics

Theoretical description of the preference of vicinal alkyl/phenyl gauche conformation by molecular mechanics. An alternative interpretation for the CH×××p attractive interaction.Several substances are used for example 1007-32-5 and 104-51-8 which are their cas registry numbers. Hirota, Minoru; Sekiya, Toshiyuki; Abe, Kazuhisa; Tashiro, Hiroshi; Karatsu, Makoto; Nishio, Motohiro; Osawa, Eiji (Fac. Eng., Yokohama Nat. Univ., Yokohama 240, Japan). Tetrahedron, 39(19), 3091-9 (English) 1983. CODEN: TETRAB. ISSN: 0040-4020. DOCUMENT TYPE: Journal CA Section: 22 (Physical Organic Chemistry) Mol. mechanics calcns. on alkyl benzyl carbinols, ketones, sulfides, and sulfoxides were carried out as a function of the torsional angle about the benzyl C-O, C-S, or C-SO bond by use of the MM2 program. Theor. consequences generally agree with the exptl. results showing that the phenyl/alkyl gauche conformer is the most preferred for all 1-phenylethyl compds. and also for some of the benzyl compds. investigated. Detailed examn. of the energy terms revealed the contribution of attractive non-bond interaction between the alkyl and Ph groups vicinally located in stabilizing the phenyl-alkyl conformer. Thus, the preference of CH×××p conformation can be interpreted by the contribution of the dispersive force. Possible participation of other attractive forces is discussed briefly. .