Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1990-04-23
1991-11-05
Shaver, Paul F.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
585534, 585538, C07F 102, C07F 104, C07F 106, C07F 100
Patent
active
050629980
ABSTRACT:
A process is provided for making metallated and substituted alkynes from feedstocks which include alkadienes containing allenic unsaturation or such alkadienes in a mixture with alkynes having either internal or terminal unsaturation, such as a mixture of propadiene and propyne. This reaction involves an initial step in which the allenic hydrocarbon and any internal alkyne is isomerized and simultaneously the resultant terminal alkynes are metallated with an alkali metal. The reaction is carried out at relatively low temperatures in a suitable inert solvent such as diethylether. When metallation is complete the reaction mixture can be contacted directly with any suitable electrophile, such as a halo silane, for example, chlorotrimethylsilane, and the alkali metal on the terminal alkyne is replaced with the desired substituent. The products thus formed are useful as monomers for preparing polymers having a variety of properties, for example, as asymmetric membranes for gas separation.
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Herman Frederick L.
Listemann Mark L.
Savoca Ann C. L.
Air Products and Chemicals Inc.
Marsh William F.
Rodgers Mark L.
Shaver Paul F.
Simmons James C.
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