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Table 1 Hydrogen bond geometries (Å, °) for 1a, cis-1b and trans-1b

From: Crystal structures of three cyclohexane-based γ-spirolactams: determination of configurations and conformations

  D–H H···A D···A D–H···A  
1a
 N1A–H1A···O1D 0.88(2) 2.10(3) 2.913(2) 154(2) x − 0.5, y − 0.5, z
 N1B–H1B···O1A 0.85(2) 2.13(2) 2.917(2) 154(2)
 N1C–H1C···O1B 0.86(2) 2.14(2) 2.940(2) 154(2) 0.5 − x, 1.5 − y, − z
 N1D–H1D···O1C 0.89(2) 2.10(2) 2.934(2) 155(2) 0.5 − x, 1.5 − y, − z
Cis-1b
 N1–H1···O1 0.87(2) 2.00(2) 2.872(1) 174(1) 1 − x, 1 − y, 1 − z
Trans-1b
 N1–H1···O1 0.88(1) 1.991(1) 2.835(1) 162(1) x, 0.5 − y, 0.5 + z