Alcohols, acetylenic oxidation

Selenienylalkynylcarbinols were prepared by the addition of Grignard reagents or the sodium salts of acetylenes to 2-formylselenophene and its derivatives. The alcohols were oxidized and the resulting ketones treated with hydrazine and hydroxylamine to give the diheteroaryls 81 and 82.94... 

ALDEHYDES FROM PRIMARY ALCOHOLS BY OXIDATION WITH CHROMIUM TRIOXIDE 1-HEPTANAL, 52, 5 ALDEHYDES FROM sym-TRITHIANE n-PENTADECANAL, 51, 39 Aldehydes, acetylenic, 54, 45 Aldehydes, aromatic, 54, 45 Aldehydes, benzyl, 54, 45 Aldehydes, olefinic, 54, 45... 

Type 4A sieves. The pore size is about 4 Angstroms, so that, besides water, the ethane molecules (but not butane) can be adsorbed. Other molecules removed from mixtures include carbon dioxide, hydrogen sulphide, sulphur dioxide, ammonia, methanol, ethanol, ethylene, acetylene, propylene, n-propyl alcohol, ethylene oxide and (below -30°) nitrogen, oxygen and methane. The material is supplied as beads, pellets or powder. 

Use the reactions in this chapter along with those learned in Chapters 11 and 12 to synthesize each compound. You may use benzene, acetylene (HCsCH), two-carbon alcohols, ethylene oxide, and any inorganic reagents. 

Use Blast furnaces copper smelting steel production (basic oxygen converter process) manufacture of synthesis gas for production of ammonia, methyl alcohol, acetylene, etc. oxidizer for liquid rocket propellants resuscitation, heart stimulant decompression chambers spacecraft chemical intermediate to replace air in oxidation of municipal and industrial organic wastes to counteract effect of eutrophication in lakes and reservoirs coal gasification. 

Oxygenation of carbanions. The a1 transforming carbanions into alcohols [Pg.70]

Oxygenation of carbanions. The alkoxide form (i.e., (-BuOOLi) is capable of transforming carbanions into alcohols (after subsequent protonation). Of particular interest is the formation of acetylene oxides. 

Reactions with organic compounds. HOF converts alkenes into a-fluoro alcohols, acetylenes mainly into a-fluoro carbonyl compounds [11], aromatic compounds (benzene and its monosubstituted derivatives, p-xylene, naphthalene) into phenolic products [12], and octa-ethylporphyrin into the N-oxide [13]. 

Whilst acetylenic alcohols can be employed directly in Cadiot-Chodkiewicz reactions [9], protection of the alcohol (usefully as the Thp ether) is necessary for Castro coupling [14]. A variation based upon these two processes involves coupling of terminal alkynes with 3-bromopropynol (10) in the presence of pyridine [15]. For primary alcohol products, oxidation to the aldehyde with nickel peroxide followed by base-catalyzed decarbonylation generates the new terminal acetylene e.g. Fig. 1.10. 

Ganesh and Nicholas demonstrated that the cobalt carbonyl complexes of the acetylenic aldehydes 77 undergo facile reaction with alkoxyallyborane to provide the homoallyUc alcohols 78. Oxidative deprotection of the cobalt carbonyl complexes using ceric ammonium nitrate readily furnishes the free homoallylic alcohols 79 (Scheme 25.10). ... 

This test method is used for the determination of methane, ethane, propane, propene, acetylene, iso-butane, propadiene, butane, trans-2-butene, butene-1, isobutene, cis-2-butene, methyl acetylene and 1,3-butadiene in high-purity ethylene. The purity of the ethylene can be calculated by subtracting the total percentage of all impurities from 100.00 %. Since this test method does not determine all possible impurities such as CO, CO2, H2O, alcohols, nitrogen oxides, and carbonyl suliide, as well as hydrocarbons higher than decane, additional tests may be necessary to fully characterize the ethylene sample. 

Toxicoiogy Eye, skin, and resp. tract irritant Precaution Avoid contact with moisture and strong oxidizing agents Hazardous Decomp. Prods. CO , NO , and HCI gas HMIS Health 2, Flammability 0, Reactivity 1 Uses Antioxidant In dietary supplements o-Acetyl-L-camitine hydrochloride. See Acetyl-L-camitine hydrochloride Acetylene carbinol. See Propargyl alcohol Acetylenic glycol. See Tetramethyl decynediol Acetyl ester of lanolin. See Acetylated lanolin N-Acetyl ethanolamine. See Acetamide MEA Achiote. See Annatto (Bbca orellana)... 

Selective oxidation of a,p-unsatutrated (allylic, benzylic, acetylenic) alcohols. 

Acetylene is also protected as propargyl alcohol (300)[2H], which is depro-tected by hydrolysis with a base, or oxidation with MnOi and alkaline hydrolysis. Sometimes, propargyl alcohols are isomerized to enals. Propargyl alcohol (300) reacts with 3-chloropyridazine (301) and EtiNH to give 3-diethylami-noindolizine (303) in one step via the enal 302[2I2]. Similarly, propargyl alcohol reacts with 2-halopyridines and secondary amines. 2-Methyl-3-butyn-2-ol (304) is another masked acetylene, and is unmasked by treatment with KOH or NaOH in butanol[205,206,213-2l5] or in situ with a phase-transfer cata-lyst[2l6]. 

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