A NEW STABLE MODIFIED BOROHYDRIDE REAGENT, EFFICIENT REDUCTION OF DIFFERENT FUNCTIONAL GROUPS WITH SULFURATED BARIUM BOROHYDRIDE [BA(BH2S3)2] IN DRY THF
摘要:
Barium and strontium sulfurated borohydrides, Ba(BH2S3)(2),Sr(BH2S3)(2) the two newly introduced modified borohydride agents, are prepared from NaBH2S3 by metathesis reaction with BaCl2 and SrCl2 in good yields. Ba(BH2S3)(2) is more stable and more reactive than Sr(BW2S3)(2) The reducing ability of Ba(BH2S3)(2) for the reduction of aldehydes, ketones, alpha,beta -unsaturared carbonyl compounds, azides, nitro compounds, and cleavage of epoxides in dry THF is described.
An oxorhenium complex bearing a chiral cyclohexane-1-olato-2-thiolato ligand: Synthesis, stereochemistry, and theoretical study of parity violation vibrational frequency shifts
In our effort towards measuring the parity violation energy difference between two enantiomers, a simple chiral oxorhenium complex 5 bearing enantiopure 2‐mercaptocyclohexan‐1‐ol has been prepared as a potential candidate species. Vibrational circular dichroism revealed a chiral environment surrounding the rhenium atom, even though the rhenium is not a stereogenic center itself, and enabled to assign
Highly Efficient, Regio- and Stereoselective Ring Opening of Epoxides and Thiiranes with Ce(OTf)<sub>4</sub>
作者:N. Iranpoor、M. Shekarriz、F. Shiriny
DOI:10.1080/00397919808005728
日期:1998.1
Abstract Cerictriflate, Ce(OTf)4 is used as an efficient catalyst for ring opening of epoxides in the presence of alcohols, water, and acetic acid. The reactions proceed with high regio and stereoselectivity and in excellent yields. The reaction of R(+) styrene oxide with methanol occurs with excellent optical purity. Ring opening of thiiranes in alcohols, water and acetic acid followed by dimerisation