Thermally Rearranged Mixed Matrix Membranes from Copoly(o-hydroxyamide)s and Copoly(o-hydroxyamide-amide)s with a Porous Polymer Network as a Filler-A Comparison of Their Gas Separation Performances.

Copoly(o-hydroxyamide)s (HPA) and copoly(o-hydroxyamide-amide)s (PAA) have been synthesized to be used as continuous phases in mixed matrix membranes (MMMs). These polymeric matrices were blended with different loads (15 and 30 wt.%) of a relatively highly microporous porous polymer network (PPN).

Regio- and stereospecific cleavage of silyl- and disilylepoxides with lithium diphenylphosphide.

Unsubstituted or alpha- and beta-C-substituted silylepoxides react stereospecifically with lithium diphenylphosphide, optionally followed by methylation, to give vinylphosphonium iodides or vinylphosphine oxides resulting from alpha-opening and silyl enol ethers, vinylsilanes or alpha-hydroxysilanes by beta-opening. On the other hand, alpha,beta- or alpha,alpha-disilylepoxides afforded beta-silyl vinylphosphine oxides or alpha-silylated silyl enol ethers by alpha- and beta-cleavage, respectively. All compounds are interesting synthons in organic chemistry.

Remote Stereocontrol in Carbonyl Additions Promoted by Vinylstannanes.

syn to tin is the preferred mode of addition of organolithium reagents to the carbonyl group of cyclic ketones with a β-stannylvinyl group. This remarkable remote control is a consequence of the anchoring of the organolithium reagent by the tin and carbonyl groups.