And properties of acetylenic derivatives

S. F. Vasilevsky Synthesis and properties of acetylenic derivatives of pyrazoles 2002AHC1... 

Syntheses and properties of acetylenic derivatives of pyrazoles 02AHC(82)1. Syntheses of 2-pyrazolines by the reactions of a,/ -unsaturated aldehydes, ketones, and esters with diazoalkanes, nitrile imines, and hydrazines 02JHC1. 

Vasilevsky, S.F., Tretyakov, E.V. and Elguero, J. (2002) Synthesis and properties of acetylenic derivatives of pyrazoles, in Advances in Heterocyclic Chemistry, vol. 82 (ed. A.R. Katritzky), Elsevier, New York-London, pp. 1-99. 

S. F. Vasilevsky and E. V. Tetryakov (Novosibirsk, Russia), together with J. Elguero (Madrid, Spain), have summarized the synthesis, chemical and spectroscopic properties, and biological activity of acetylenic derivatives of pyrazoles, a field which has shown explosive growth in the past few years. 

Goncales CEP, Araldi D, Panatieri R B, Rocha J B T, Zeni G and Nogueira C W (2005), Antinociceptive properties of acetylenic thiophene and furan derivatives Evidence for the mechanism of action , Life Sciences, 76, 2221-2234. 

J. A. Osborne, F. J. Jardine, J. F. Young, G. Wilkinson, The Preparation and Properties of Tris(triphenylphosphi-ne)halogenorhodium(I) and some Reactions thereof including Catalytic Homogeneous Hydrogenation of Olefins and Acetylenes and their Derivatives, J. Client Soc A. 1966,1711-1732. 

Artali, R. et al.. Synthesis, x-ray crystal structure and biological properties of acetylenic flavone derivatives, Farmaco, 58, 875, 2003. 

Explosive Properties and Decomposition of Copper Derivatives of Acetylene Hydrocarbons... 

The most stable linear HEEH molecule will be formed by dimerisation of HC, where we have a total of 10 electrons (four from each C and one from each H) to insert into the MOs. These will lead to a triple bond, i.e. we have one filled o bonding MO and two filled ji bonding MOs after disregarding the MOs derived from a,. This is consistent with the properties of acetylene HC=CH. Linear HFFH offers no advantages compared with HF all F-F bonding cancels out if we have 16 electrons, filling all eight MOs in Fig. 7.9. 

Acetylenecarboxylic esters, reactions with nitrogen-containing heterocycles, 23, 263 Acetylenic derivatives of pyrazoles, synthesis and properties of, 82, 1 Acetylenic esters, synthesis of heterocycles through nucleophilic additions to, 19,297 Acid-catalyzed polymerization of pyrroles and indoles, 2, 287... 

The chemistry of the zerovalent state in nickel, palladium, and platinum compounds is reviewed. After a historical introduction in which the development of this chemistry is analyzed in terms of the current theory of the stabilization of low valency states, the most interesting classes of zerovalent compounds are described. The stability and properties of these compounds are discussed and related to the nature of the ligands and the coordinated metal. The catalytic properties of these zerovalent derivatives toward olefins, diolefins, and acetylenes are considered in connection with the facility of ligands exchange, the variation of coordination number, and the stereochemistry. A discussion of the % bond is reported. 

Thus, the data obtained show that chloroform and acetylene and its derivatives are suitable IR-spectroscopic probe-molecules for basic centers in zeolites. These probes exhibit the following advantages as compared to the conventionally used molecules, like CO2 and pyrrole (1) the wride ranges of the frequency shifts, which allows one to differentiate the centers of different nature and strength, (2) the easiness and reversibility of adsorption/desorption of these molecules, and (3) the favorable spectral range where the spectral features attributed to adsorbed probes appear. The use of such an approach allows us to shed some light on the nature and properties of basic sites in zeolites. The similar technique will be applied in our future studies devoted to other solid superbases. 

Major producers manufacture acetylene by either the partial oxidation of natural gas or as a coproduct of the thermal cracking of ethylene minor producers manufacture acetylene from calcium carbide. About 80% of production is used as a closed system intermediate in the manufacture of acetylene black as well as acetylenic and vinyl derivatives used in a variety of applications such as the manufacture of plastics. The remaining 20% is used primarily in oxyacetylene torches for welding and metal cutting. Although acetylene was used as an anesthetic in the early 1900s, this use has fallen into disfavor due to the explosive properties of acetylene. 

Synthesis and properties of fluoropyrroles and their analogues 12S2115. Synthesis of pyrroles from acetylene derivatives 13MI21. 

H. Goto, X. Dai, T. Ueoka, K. Akagi, Synthesis and properties of polymers from monosubstituted acetylene derivatives bearing ferroelectric liquid crystalline groups, Macromolecules, 37, 4783-4793 (2004). 

Because of the versatility of the polyurethane system it is possible to introduce comonomers which can affect the physical properties of the derived polymers. For example, photo cross-linkable polyurethanes are formulated using 2,5-dimethoxy-2,4 -diisocyanato stilbene as a monomer (76). Comonomers, having an azoaromatic chromophore, are used in optical bleaching applications (77), or in the formation of photorefractive polymers (78). The latter random poljnners have second-order nonlinear optical (NLO) properties. Linear poljnners are also obtained from HDI/PTMG and diacetylenic diols. These polymers can be cross-linked through the acetylenic linkages producing a network polymer with properties similar to poly(diacetylenes) (79). 

Osborn, J. A. Jardine, R H. Young, J. R Wilkinson, G. The preparation and properties of tris(triphenylphosphine)halogeno-rhodium(I) and some reactions thereof including catalytic homogeneous hydrogenation of olefins and acetylenes and their derivatives. /. Chem. Soc. A 1966,1711-1732. 

In contrast, l-chloroacetylene-2-phosphonates 4.981 and acetylene-1,2-diphosphonates 4.982 have a less activated triple bond and require a rather high temperature for the Diels-Alder reaction. The process is accompanied by aromatization of the initial 1,4-cyclohexadiene derivative and there is tarring due to polymerization of the parent 1,3-diene. However, a series of phosphorus-containing 1,4-cyclohexene derivatives was isolated and some of the properties of the derivatives studied [437, 438] (Scheme 4.7). Similar reactions were performed starting with haloacetylenephosphonates. All these reactions give rise to a variety of cyclohexene, cyclohexadiene, and benzene derivatives. 

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