New Chiral Zwitterionic Phosphorus Heterocycles: Synthesis, Structure, Properties and Application as Chiral Solvating Agents
作者:Andrey E. Sheshenev、Ekaterina V. Boltukhina、Anastasiya A. Grishina、Ivana Cisařova、Ilya M. Lyapkalo、King Kuok Mimi Hii
DOI:10.1002/chem.201300062
日期:2013.6.17
A family of new chiral zwitterionic phosphorus‐containing heterocycles (zPHC) have been derived from methylene‐bridged bis(imidazolines). These structures were unambiguously determined, including single‐crystal XRD analysis for two compounds. The stability, acid/base and electronic properties of these dipolar phosphorusheterocycles were subsequently investigated. zPHCs can be successfully employed
A mild and efficient method for the preparation of guanidines
作者:Michael A. Poss、Edwin Iwanowicz、Joyce A. Reid、James Lin、Zhengxiang Gu
DOI:10.1016/s0040-4039(00)61092-4
日期:1992.9
A mild and efficientmethod for the preparation of guanidines by reaction of an acylated thiourea with an amine followed by removal of the acyl group(s) from the intermediate acylguanidine is reported.