Spiral hexatrienes. The hindered cis isomer of mini-carotene-3 and hexakis-(2,2′,4,4′,6,6′-trifluoromethyl)stilbene

Nmr and computer-aided studies of the th

Nmr and computer-aided studies of the three interchanging stereoisomers of the cyclic hexapeptide cyclo[-Pro1-Gly2-Glu3(OBzl)-Pro4-Phe5-Leu6-]: Unexpected observation of a cis isomer of a secondary amide peptide bond in the presence of two trans proline peptide bonds

✍ Ian Mc Ewen 📂 Article 📅 1993 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 692 KB

The cyclic hexapeptide cycle[ -Pro'-Gly2-Glu3 (OBzl) -Pro4-Phe5-Leu6-] ( 1 ; OBzl: benzyl ester) was modeled and synthesized to be used as a chiral site for the separation of enantiomers. Total correlation spectroscopy and nuclear Ovehauser effect spectroscopy spectra of the peptide in CDCIB showed