Acetylene glycol

In the presence of copper acetyhde catalysts, propargyl alcohol and aldehydes give acetylenic glycols (33). When dialkylamines ate also present, dialkylaminobutynols are formed (34). 

Many similar hydrocarbon duids such as kerosene and other paraffinic and naphthenic mineral oils and vegetable oils such as linseed oil [8001-26-17, com oil, soybean oil [8001-22-7] peanut oil, tall oil [8000-26-4] and castor oil are used as defoamers. Liquid fatty alcohols, acids and esters from other sources and poly(alkylene oxide) derivatives of oils such as ethoxylated rosin oil [68140-17-0] are also used. Organic phosphates (6), such as tributyl phosphate, are valuable defoamers and have particular utiHty in latex paint appHcations. Another important class of hydrocarbon-based defoamer is the acetylenic glycols (7), such as 2,4,7,9-tetramethyl-5-decyne-4,7-diol which are widely used in water-based coatings, agricultural chemicals, and other areas where excellent wetting is needed. 

Sutfynol Air Products and Chemicals Inc. acetylenic glycols defoamers and low foam wetting agents... 

Surfynol 104 is an acetylenic glycol, 2,4,7,9-tetramethyl-5-decyne-4, 7-diol [126-86-3] marketed by Air Products and Chemicals, Inc. 

Acetylenic glycols, 1 249-250 physical properties of, l 250t N-Acetylethanolamine, physical properties of, 2 124t... 

If ether is substituted for tetrahydrofuran m this preparation, acetylenic glycol is the sole product. The submitters... 

Acetylene, purification, 39, 58 Acetylene, diphenyl-, 34, 42 y-hydroxypropyl, 33, 68 Acetylenedicarboxyuc acid, dimethyl ESTER, 32, SS Acetylenic glycols, 39, 57 2- -Acetylphenylhydroquinone, 34,1 S-Acetyl- -valeric acid, 31, 3 Acid chlorides, 39, 19 synthesis of, 37, 69... 

The researches of Zal kind were concerned with the catalytic hydrogenation of acetylenic compounds acetylenic glycols add only two hydrogen atoms over palladium and divinylacetylenes add only six hydrogen atoms, the hydrogenation being limited to the formation of olefins (431). 

The catalyzed additions of substituted germanes to terminal acetylenes, CHCCH2CI and acetylenic glycols resemble the corresponding hydrosilations . Chlorogermanes add spontaneously to CHCCH2CI, and catalysts tend to promote substitution of chlorine by hydrogen rather than addition to the triple bond. 

The reagent, usually in combination with a strong acid, is used as catalyst for effecting additions to acetylenes. Hydration of the acetylenic glycol (1) is effected by adding 25 g. of the finely powdered material within 20 min. to a vigorously... 

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