acetylene

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acetylene

 [ah-set´ĭ-lēn]
HC≡CH, a colorless, combustible, explosive gas, the simplest alkyne (unsaturated, triple-bonded hydrocarbon).
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Similarly to 14, the imaginary frequency of transition state 22 corresponds to the elongation of the C-H bond of the acetylenic proton.
Computational study of the copper-free Sonogashira cross-coupling reaction: shortcuts in the mechanism/Vasevaba Sonogashira ristkondensatsioonireaktsiooni modelleerimine: otseteed reaktsioonimehhanismis
Caulerpenyne, a unique acetylenic sesquiterpenoid that is closely related to flexilin, was first isolated from a Mediterranean collection of C.
Chemical defenses: from compounds to communities
Once the optimum molecule was achieved, its performance in pigment concentrates with and without a resin was compared to other conventional dispersants such as a styrent acrylate copolymr, an acetylenic diol surfactant, and a styrene maleic anhydride comb polymer modified with a polyether.
Use of novel polyetheralkanolamine comb polymers as pigment dispersants for aqueous coating systems
Typical inhibitors are materials that have higher affinity for platinum than the siloxane polymer vinyl group and include such materials as peroxides, hydroperoxides, and acetylenic derivatives.
Silicone elastomers for healthcare tubing: with the variety of tubing options available to medical device manufacturers, it is often difficult to determine which type would be best suited to a particular application. This article highlights the benefits and physical properties of silicone elastomer tubing and provides a comprehensive look at its most prominent indication
The flower oil contains as minor constituents two acetylenic thiophenes: 5'-methyl-5-(3-buten-1-ynyl)-2,2'-bithienyl (2) (Fig.
A source of almost pure methyl chavicol: volatile oil from the aerial parts of Tagetes lucida (Asteraceae) cultivated in Costa Rica
To the extent that both components originate from the same source, acetylenic free radicals that generate polyaromatic structures in the flaming stage of combustion, one would expect similar [.sup.14]C composition.
The remarkable metrological history of radiocarbon dating [II]
These include genes for the production of hydroxy fatty acids, found in castor oil and used in lubricants and inks; conjugated fatty acids from tung seeds; and acetylenic fatty acids found in another dandelion relative, Crepis alpina.
More plastic from plants
Tazarotene (Tazorac) is the first of a family of receptor-selective acetylenic retinoids.
Management of acne. (Research Findings That Are Changing Clinical Practice)
While examining the hydroformylation of acetylenic substituted thiazoles, Van den Hoven and Alper discovered the new reaction, which has several remarkable features.
CANADIAN CONCENTRATES/CONCENTRES CANADIENS
The rhizomes of Cang Xu (atractylodes lancea) and a related plant, Bai Xu (atractylodes macrocephalia) have been used for at least 2000 years in China for the removal of dark spots on the face and hands and skin whitening liniments.[12] Atractylodin, an acetylenic furan derivative present in high amounts in these extracts, may be a tyrosinase inhibitor.
Formulation of Plant-based Skin Whitening Cosmetics
Newest chemical catalog for 2000-2001 integrates classic product lines with new acquisitions such as Sodium Biphenyl, QUAT products, and greatly expanded organic product line including acetylenic derivatives and cholesteryl products.
Literature Resource Guide
Called linear acetylenic carbon, the new allotrope, or form, of the otherwise sooty element shows up as amber-colored, "gossamerlike" threads, whose texture resembles "angel hair," according to Richard J.
A new form of linear carbon

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