Cuprous latter process

Another approach to separate butadiene from other hydrocarbons is to use a solution containing cuprous ammonium acetate that forms a weak copper(I) complex with butadiene (243,244). The latter process has been used in a number of plants. 

The principal components of the cut are butene-1, butene-2, isobutylene and butadiene-1,3. Methyl, ethyl, and vinyl acetylenes, butane and butadiene-1,2 are present in small quantities. Butadiene is recovered from the C4 fraction by extraction with cuprous ammonium acetate (CAA) solution, or by extractive distillation with aqueous acetonitrile (ACN). The former process is a liquid-liquid separation, and the latter a vapor-liquid separation. Both take advantage of differences in structure and reactivity of the various C4 components to bring about the desired separation. 

The hydrosilylation of internal alkynes with triethoxysilane proceeds clearly to afford vinylsilane as a mixture of (Z) regioisomers and is followed by protodesilylation. The latter cuprous iodide initiated process allows a neat trans-alkyne reduction of a wide variety of alkynes. In the experiment, the interme-... 

A characteristic example of the phosgene-based process for manufacture of polycarbonates is the synthetic method used by Dow Chemical Co. A typical variation of the process uses bisphenol A, diphenyl carbonate, phosgene, cuprous chloride, and an oxygen-containing gas. Thus, when a phenol is reacted with phosgene, a diaryl carbonate is formed, which is then reacted with a bisphenol monomer to obtain a bisphenol polycarbonate and phenol, the latter of which after separation from the polycarbonate is reacted with more phosgene, and the diaryl carbonate thus produced is cycled back into the process for reaction with the bisphenol monomer. 

---