Alkenylthioimidoyl Radicals: Competition between β-Scission and Cyclization to Dihydrothiophen-2-ylidene-amines
摘要:
But-3-enylthiolmidoyl radicals were shown by EPR spectroscopy and end product analysis to ring-close predominantly in the 5-exo mode with a rate constant of 2.4 x 10(4) s(-1) at 300 K to afford substituted dihydrothiophenylmethyl radicals. This ring closure was in competition with dissociation to but-3-enyl radicals and an isothiocyanate. The dissociation predominated at temperatures above ca. 300 K.
We synthesized a series of small symmetrical unsaturated disulfides by a multi-step reaction starting from organic alcohols, and we performed a preliminary test to evaluate the effect of these compounds on the viability of A549 lung cancer cells. The garlic-derived natural compound diallyl disulfide, known for its anticancer activity, was used as the lead compound in this study. We synthesized five
Alkanethioimidoyl Radicals: Evaluation of β-Scission Rates and of Cyclization onto <i>S</i>-Alkenyl Substituents
作者:Matteo Minozzi、Daniele Nanni、John C. Walton
DOI:10.1021/jo0353637
日期:2004.3.1
Thioimidoyl radicals were generated by addition of alkylsulfanyl radicals to alkyl isonitriles and were characterized by electron paramagnetic resonance (EPR) spectroscopy. The β-scissions of their C•S−C bonds were studied by variable-temperature EPRspectroscopy and the fragmentation rate constants and activation energies were calculated. The scission rates depend on the stability of the released alkyl radicals
A deodorant composition comprises one or several phenolic compounds, at least enzyme capable of oxidizing the phenolic compound(s), and a flavor or fragrance. The flavor or fragrance meets the satisfaction criteria for freshness, cleanliness and pleasant feeling. The satisfaction criteria are expressed in terms of scores ranging from 0 to 100 points. Typically, the scores exceeding 50 points signify a satisfactory result. The preferred fragrances include citrus-type, fruit-type, floral-type, musk-type, wood-type, greenery-type, spice-type, herb-type and mint-type fragrance. By contrast, the preferred flavor include citrus-type, mint-type, fruit-type, vanilla-type, spice-type and floral-type flavor. The deodorant composition can be formulated with an appropriate carrier. The composition or the carrier-bearing composition can be applied to malodorous objects, human bodies or mammals.
A salty taste enhancer of the present invention includes a finely ground plant tissue product in which at least a part of cell walls are destroyed and which passes through a size of 140-mesh, and a flavor component including a Maillard reaction product and a sulfur-containing compound. In particular, when the finely ground plant tissue product includes a sterol or a sterol fatty acid ester shown by the following general formula (1), an excellent salty taste enhancing effect is exhibited, and even if an amount of a salt used is reduced, the impact of a first taste and the retention of an aftertaste can be enhanced, and the amount of the salt used can be reduced without impairing a taste of food and drink. (Provided that in the formula (1), R1 represents a hydrogen atom or a fatty acid residue, and R2 represents a hydrocarbon group including no double bond.)
Rubber composition and pneumatic tire using the same
申请人:Toyo Tire Corporation
公开号:US11530319B2
公开(公告)日:2022-12-20
There is provided a rubber composition which can provide a tire having an excellent balance of the breaking properties, the rolling resistance performance (low fuel consumption) and the wet grip performance. The rubber composition includes 100 parts by mass of a diene rubber, and 1 to 100 parts by mass of fine particles (A) having a glass transition point of −70° C. to 0° C. and composed of a polymer comprising constituent units of at least one monofunctional monomer. The fine particles (A) have a crosslinked structure crosslinked by at least one polyfunctional monomer having a polysulfide bond in which at least two successive sulfur atoms are bonded together.