- Probing Interactions between Hydrocarbons and Auxiliary Guests inside Cucurbit[8]uril
-
The affinities of 20 hydrocarbons for the cavity formed by the inner wall of cucurbit[8]uril and a tolyl unit linked to an auxiliary guest were measured in aqueous solution. Cucurbit[8]uril and the auxiliary guest, a substituted ruthenium tris(2,2′-bipyridyl) complex bearing a trifluoromethyl 19F NMR probe, displayed perfect selectivity toward cyclic hydrocarbons, and cis- and trans-decalin, in particular. Unlike π-π interactions, CH-π interactions, as well as differences in hydrocarbon solvation, contribute significantly to the recognition process.
- Rabbani, Ramin,Masson, Eric
-
-
Read Online
- Evidence for Hydrogen Abstraction Mediated by Discrete Nitrogen and Oxygen Triplets in 4-Trifluoromethyl-2-isovalerylpyridine
-
Irradiation of 1b leads to abstraction of hydrogen by nitrogen and formation of 2b, as well as abstraction of hydrogen by oxygen and formation of 3b and 4b.Stern-Volmer quenching data and triplet sensitization experiments provide evidence that these reactions are mediated by two discrete n?* triplet states: a carbonyl oxygen triplet, ET ca. 70 kcal/mol, τ ca. 13 ns, and a nitrogen triplet lying at somewhat higher energy, τ ca. 31 ns.
- Rao, C. Janakiram,Agosta, William C.
-
-
Read Online
- USE OF STROBILURIN TYPE COMPOUNDS FOR COMBATING PHYTOPATHOGENIC FUNGI CONTAINING AN AMINO ACID SUBSTITUTION F129L IN THE MITOCHONDRIAL CYTOCHROME B PROTEIN CONFERRING RESISTANCE TO QO INHIBITORS VIII
-
The present invention relates to the use of strobilurin type compounds of formula I and the N-oxides and the salts thereof for combating phytopathogenic fungi containing an amino acid substitution F129L in the mitochondrial cytochrome b protein (also referred to as F129L mutation in the mitochondrial cytochrome b gene) conferring resistance to Qo inhibitors, and to methods for combating such fungi. The invention also relates to novel compounds, processes for preparing these compounds, to compositions comprising at least one such compound, and to seeds coated with at least one such compound.
- -
-
Page/Page column 34-35
(2022/02/28)
-
- Fungicides
-
Compounds having formula (I) STR1 wherein R1, R2 and A are defined as in the specification. The compounds are useful as fungicides.
- -
-
-
- Substituent Effects on Photochemical Hydrogen Abstraction in 2-Acylpyridines, 2-Acylpyrazines, and 4-Acylpyrimidines
-
Stern-Volmer quenching of the photochemistry of 1c indicates that N- and O-abstraction (eqs 1 and 2, respectively) are quenched at different rates (Figure 1).For quenching of 2c kqτ is 157 M-1 and for 3c, 64 M-1.When 1c is sensitized with triplet sensitizers of increasing ET,N-abstraction increases (Table 1).These data indicate that N- and O-abstraction in 1c take place from distiguishable triplet states.Survey of Φp's of ring-substituted ketones 1b-d, 6d, 7a,b,d, 8b, 9b,d, 10b, and 11d demonstartes the effect of substitution on the competition between N- and O-abstraction (Table 2).For methyl- and dicyano-substituted ketones, the results can be understood simply in terms of shifts in ET of the n?* and ??* states of the heterocycle.The photochemistry of all these ketones requires consideration of interactions among three triplet states.
- Rao, C. Janakiram,Agosta, William C.
-
p. 2125 - 2131
(2007/10/02)
-