Methyl acetylene

MMA from Propyne. Advances in catalytic carbonylation technology by Shell researchers have led to the development of a single-step process for producing MMA from propyne [74-99-7] (methyl acetylene), carbon monoxide, and methanol (76—82). 

Methyl acetylene F Most common metals Copper, silver, mercury and... 

Methyl(/i-amyl)ketone (2-heptanone) 5-Methyl-3-heptanone Methyl acetate Methyl acetylene... 

Hydrazoic acid Hydrides, volatile Hydrogen cyanide (unstabilized) Hydrogen (low pressure) Hydrogen peroxide (> 35% water) Magnesium peroxide Mercurous azide Methyl acetylene Methyl lactate Nickel hypophosphite Nitriles > ethyl Nitrogen bromide... 

The irradiation of the thiophene in gas phase yields ethylene, allene, methyl-acetylene, carbon disulfide, and vinylacetylene. No Dewar thiophene or cyclo-propene derivatives were isolated (69CJC2965). The irradiation in liquid phase gave the Dewar thiophene which can be trapped as a Diels-Alder adduct with furan (85JA723). The Dewar thiophene and cyclopropene-3-thiocarbaldehyde can be obtained by irradiation in argon matrices at 10 K (86JA1691). 

The key component is methyl acetylene, C3H4. Recovery will be based on 96.5% of this material. 

Figure 3-13. The influence of conversion severity on the theoretical product yield for the cracking of propane. Acetylene, methyl acetylene, and propadiene are hydrogenated and both ethane and propane are recycled to extinction (wt%)." ...

The facile thermal decomposition of the dimethyl and diethyl derivatives of (II) to nitrogen and carbene intermediates is emphasized by the readily discernible correlations between the reactant and product orbitals. On the other hand, the greater delocalization of the molecular orbitals of (I) may be a factor in its preference to rearrange, without decomposition, to methyl acetylene and allene. 

Methyl acetylene, 16, 42, 116 Methyl cyanide, 118 Methyl fluoride, 107 lone pairs, 42... 

CH3C = CH, mw 40.07, colorl liquified gas bp —23.1°, fr p —101.5° flammable, dangerous fire and expl risk. It is self-reactive, and can decomp explosively at 4.5 to 5.6 atms press (Ref 2). An expin occurred at Dow s Freeport, Texas plant in 1960 while workers were loading a small tank of methyl acetylene. Following this expln, a 2000 gal tank blew up and burned for hours. The cause of the blasts were not detd (Ref 1)... 

Addnl Ref A.R. Hall R.A.M. St raker, The Methyl Acetylene (Propyne) Decomposition Flame at Pressures of 10, 20 and 40 Atmospheres , RPE Tech Note 192, RPE, Westcott (Engl) (1960)... 

Cold hydrogenation may also be used for the selective hydrogenation of butadiene and for the selective hydrogenation of methyl acetylene and pro-padiene in propylene feedstocks (K22). 

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