Disodium acetylide

Dicaesium acetylide Copper(ll) acetylide Dicopper(l) acetylide Silver acetylide Caesium acetylide Potassium acetylide Lithium acetylide Sodium acetylide Rubidium acetylide Lithium acetylide-ammonia Dipotassium acetylide Dilithium acetylide Disodium acetylide Dirubidium acetylide Strontium acetylide Silver trifluoromethylacetylide Sodium methoxyacetylide Sodium ethoxyacetylide... 

Disk filters, 11 374-377 16 658. See also Rotary disk vacuum filters Disk flat blade turbine, 16 701 Disk meters, nutating, 11 655 Disk pumps, 21 69 Dislocation density, 13 496 Disodium 5 -guanylate (GMP), 12 49 Disodium 5 -inosinate (IMP), 12 49 Disodium acetylide, 22 765 Disodium cocoamphodiacetate, cosmetic surfactant, 7 834t Disodium decacarbonyldichromide, 6 528-529... 

Sodium Carbide- See in Vol 1, A82-L under Disodium Acetylide or Sodium Carbide ... 

Disilicon hexabromide, 2 98 Disilicon hexachloride, 1 42 Disiloxane, hexamethyl-, formation of, by hydrolysis of hexa-methyldisilazane, 5 58 Disilver fluoride, 5 18, 19 Disodium acetylide, NaC=CNa,... 

CN2Ag2 Silver cyanamide, 1 98 CN2H2 Cyanamide, 3 39, 41 CNa=CNa Disodium acetylide, 2 79, 80... 

Miscellaneous reactions. For ethynyl-containing precursors like 54-60, an efficient synthesis is the treatment of the dilithium (or disodium) acetylide intermediates with chlorotrialkoxysilane as a silylating reagent (equation 15). The reaction leads to moderate to high yields and is an alternative to the Heck reaction93,98 99. 

Disodium acetylide, prepared from sodium and acetylene in liquid ammonia, was reacted first with tellurium and then with methyl iodide to give methyl methyltelluroethynyl tellurium4. 

Zr, disodium acetylide, oxidants. Can react vigorously with oxidizing materials. A common air contaminant. When heated to... 

In 1961, Wotiz and Dale independently reported the new syntheses of non-conjugated cyclic polyynes. When a,a -dibromides are treated with a mixture of sodium acetylide and disodium acetylide in liquid ammonia, cyclic diynes (129) are obtained together with the linear polyynes (130). Sodium acetylide, being a chain terminator, prevents the formation of large amounts of linear polyynes. 1,8-Cyclo-tetradecadiyne (129, n = 5) and the 22-membered dioxadiyne (131) were obtained by this method. 

Disodium acetylide [1, 350, before Disodium phenanthrene], A mixture of mono-and disodium acetylide reacts with an a,co-dibromide (1) to give a nonconjugated linear polyacetylene (2) and a cyclic polyacetylene (3).1 The method has been improved by carrying out the reaction in an autoclave at room temperature.2... 

Dipotassium platinum tetrachloride, 182 Dipotassium rhodizonate, 262 N,N -Disalicyle(hylenediamine, 360 Disodium acetylide, 182 Disodium phenanthrene, 182 Dispiro[2.0.2.2]octene-7, 388 Dispiro[5.1.5. l]tetradecane-7,14-dione, 428, 429... 

LEAD (7439-92-1) Dust or powders form flammable or explosive mixture with air. Powder reacts violently with ammonium nitrate, sodium acetylide, strong oxidizers. Reacts with and/or forms heat- and shock-sensitive explosive products with ammonia, chlorine trifluoride, A/A -dinitro-l,2-diaminoethane, disodium acetylide, hydrogen peroxide (concentrated), hy-drazoic acids, isopropylbenzene hydroperoxide, methyl isocyanoacetate, nitryl fluoride, oxidizers, picric acid, sodium acetylide, sodium peroxyborate, sodium azide, trinitrobenzoic acid, urea nitrate. 

There is little evidence of the direct formation of sodium carbide from the elements (29,30), but sodium and graphite form lamellar intercalation compounds (16,31—33). At 500—700°C, sodium and sodium carbonate produce the carbide, Na C above 700°C, free carbon is also formed (34). Sodium reacts with carbon monoxide to give sodium carbide (34), and with acetylene to give sodium acetylide, NaHC2, and sodium carbide (disodium acetylide), Na2C2 (see Carbides) (8). 

An addition which completely destroys the triple bond — but at the same time illustrates the synthetic usefulness of 100 - is demonstrated by the trapping of its etherate complex (see above) with dimethylamine under in-situ conditions the glycinamide 147 is isolated in 50% yield [92] according to Eq. (28). Formally, 100 has behaved in this transformation as an equivalent of the synthon 148 in the same sense as disodium acetylide (149) is synthetically equivalent to the dianion ISO. 

The sodium amide (20 mols) is prepared in 5 1. of liqmd ammonia in a 12-1. flask by the procedure described in synthesis 38, then acetylene is introduced exactly as in part B. No gas is evolved through the condenser, and the reaction mixture becomes milky with insoluble disodium acetylide, which masks the dark color imparted by colloidal iron. The milkiness persists until the theoretical amount of acetylene has been added, when the original deep-brownish or black iron color appears. Acetylene is absorbed for a few minutes longer, to saturate the ammonia solution, and is then discharged through the condenser as a final indication that the reaction is complete. 

Sodium acetylide is said to disproportionate to disodium acetylide and acetylene when heated to 160 to 210° under reduced pressure disodium acetylide is stable to a much higher teme acture, finally decomposing into sodium and carbon. It has been repeatedly observed that when sodium acetyhiL is heated to about 150° at atmospheric pressure an extensive decomposition occurs. This proceeds spontaneously and gases are evolved that catch fire in the air (owing to pyrophoric carbon). A black residue remains that is still very reactive. 

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