General Information. Commercial reagents were purified prior to use following the guidelines of Perrin and Armarego.1 Organic solutions were concentrated under reduced pressure on a Büchi rotary evaporator. Chloroform was distilled from calcium hydride prior to use.Chromatographic purification of products was accomplished using forced-flow chromatography on ICN 60 32-64 mesh silica gel 63 according to the method of Still. 2 Thin-layer chromatography (TLC) was performed on EM Reagents 0.25 mm silica gel 60-F plates.Visualization of the developed chromatogram was performed by fluorescence quenching or anisaldehyde stain.

No abstract

General Information. Commercial reagents were purified prior to use following the guidelines of Perrin and Armarego. 1 Organic solutions were concentrated under reduced pressure on a Büchi rotary evaporator. Chloroform was distilled from calcium hydride prior to use.Chromatographic purification of products was accomplished using forced-flow chromatography on ICN 60 32-64 mesh silica gel 63 according to the method of Still. 2 Thin-layer chromatography (TLC) was performed on EM Reagents 0.25 mm silica gel 60-F plates.Visualization of the developed chromatogram was performed by fluorescence quenching or anisaldehyde stain.

General Information. Commercial reagents were purified prior to use following the guidelines of Perrin and Armarego.1 Organic solutions were concentrated under reduced pressure on a Büchi rotary evaporator. Chloroform was distilled from calcium hydride prior to use. Chromatographic purification of products was accomplished using forced-flow chromatography on Iatrobeads 6RS-8060 according to the method of Still. to determine enantiometric excess were developed using racemic samples.