Acetaldehyde ethyne

Acetylen Acetylene EINECS 200-816-9 Ethine Ethyne HSDB 166 Narcylen UN1001, An asphyxiant gas intermediate for manufacture of vinyl chloride, vinylidene chloride, vinyl acetate, acrylates, acrylonitrile, acetaldehyde, perchloroethylene trichloroethylene, 1,4-butanediol, carbon black, welding and cutting metals. Colorless gas mp = -81° d = 1,166 g/l (0°, 760 mm), d of gas = 0.90 (air = 1) soluble in H2O (1 1 v/v), soluble in AcOH, EtOH, Et20, CeHe, MezCO LC (rat inh) = 9000 ppm. Air Products Chemicals Inc. BASF Corp. BOC Gases Union Carbide Corp. 

With dilute sulfuric acid at 60-80°C and mercury(II) catalyst, ethyne forms ethanal (acetaldehyde) ... 

Allynes can be hydrated in the presence of acid and HgS04 by electrophilic addition of a molecule of water to the triple bond. The reaction proceeds by way of a carbocation intermediate. Hydration of acetylene (ethyne) produces acetaldehyde (ethanal). Outline the steps that occur in this transformation. 

As shown in the fourth example of Table 6.7, hypochlorous and hypobromous acids (HOCl and HOBr, respectively) react at the carbon-carbon triple bond to produce the corresponding a,a-dihaloketone (or dihaloethanal or acetaldehyde, CH3CHO) derivative in the case of ethyne (acetylene, HC CH, itself). It is not clear whether the a-halo enol initially formed rapidly adds a second equivalent of hypo-... 

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