Chiral templates tartaric acid

Chiral diester diamide macrocycles such as ll-180 have been synthesized (181) from esters of L-valine by, first of all, forming acyclic bisamides and then hydrolyzing the ester functions prior to template-promoted cyclization with cesium carbonate (182) and the appropriate dibromide. L-Tartaric acid has also been incorporated into a macrocycle, i.e., lll-181, of this type. 

R.-H. Jin et al. reported the preparation of silica on chiral crystalline catalytic template (polyethyleneimine and d-, l-, or Roc-tartaric acid) which has fibrous and very thin nanoribbon structures where chirality... 

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