19788-49-9Relevant articles and documents
FLUORINATED OXA OR THIA HETEROARYLALKYLSULFIDE DERIVATIVES FOR COMBATING INVERTEBRATE PESTS
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Page/Page column 117, (2011/06/19)
The invention relates to alkylsulfide derivatives compounds of formula I as hererunder depicted or the enantiomers or veterinarily acceptable salts thereof which are useful for combating or controlling invertebrate pests, in particular arthropod pests and nematodes. The invention also relates to methods for controlling invertebrate pests by using these compounds and to plant propagation material and to agricultural and veterinary compositions comprising said compounds. wherein U, R1, R2, R3U, X, n and p are defined as in the description.
Preparation of New Nitrogen-Bridged Heterocycles. 42.1 Synthesis and the Reaction of Pyridinium N-Ylides Using Bifunctional Ethyl Thiocyanatoacetates
Kakehi, Akikazu,Ito, Suketaka,Hashimoto, Yasunobu
, p. 1769 - 1776 (2007/10/03)
Various pyridinium (monosubstituted methylide)s were smoothly attacked to the cyano group in ethyl thiocyanatoacetate or ethyl 2-thiocyanatopropionate to afford the corresponding pyridinium (substituted cyanomethylide)s in low-to-moderate yields, while pyridinium (unsubstituted amidate)s reacted with the ester carbonyl group in the same reagents to give pyridinium (thiocyanatoaceto)- or (2-thiocyanatopropiono)amidates in considerable yields. The 1,3-dipolar cycloadditions of some pyridinium (unsymmetrically substituted cyanomethylide)s with dimethyl acetylenedicarboxylate (DMAD) in various solvents afforded only dimethyl 3-cyanoindolizine-1,2-dicarboxylate, except a few examples. On the other hand, the treatment of pyridinium (thiocyanatoaceto)- or (2-thiocyanatopropiono)amidates with a strong base, such as potassium t-butoxide, gave new bicyclic mesoionic compounds, N-[2-(1,3,4-thiadiazolo(3,2-a]pyridinio)]acetamidate derivatives, in moderate yields. The intermediacy of N-[1-(2-thiocyanatopyridinio)]acetamidates in the formation reactions of the latter compounds was also proven by independent syntheses.
Direct synthesis of thiols from halides and epoxides using hydrosulfide exchange resin in methanol
Choi,Yoon
, p. 373 - 375 (2007/10/02)
Various thiols are prepared directly from the corresponding alkyl halides and epoxides using hydrosulfide exchange resin in methanol in the presence of equimolar amounts of triethylammonium chloride at room temperature. The reaction not only proceeds with unique chemoselectivity, but also gives better yields of thiols than most commonly used indirect methods and has an additional advantage of a simple workup.
