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Table 2 Geometrical parameters for γ-spirolactams 1b (Å, °)

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

  cis-1b trans-1b
6-membered ring
 Bond lengths 1.5188(19)–1.5413(15) 1.5237(15)–1.5465(14)
 Bond angles 109.74(10)–114.24(10) 109.08(8)–112.71(9)
 Puckering: q/θ/φ 0.5500(14)/174.57(15)/29.8(2) 0.5676(12)/176.49(12)/208(2)
 Torsion angles 49.00(14)–57.57(14) 52.52(12)–57.52(12)
5-membered ring
 C1–N1 1.3314(15) 1.3316(14)
 C–C–C 100.79(9)–108.71(10) 102.30(8)–109.09(9)
 C1–N1–C2 114.37(10) 114.1(1)
 Puckering: q/φ 0.2995(14)/282.7(2) 0.2546(12)/108.2(3)
 Torsion angles 2.56(13)–29.11(12) 0.75(13)–24.63(12)
6- to 5-memb. ring
 Dihedric angle 81.806(43) 81.007(42)
Torsion angles
 C1–C4–C5–C6 − 73.02(13) − 177.14(8)
 C1–C4–C9–C8 73.72(13) − 176.63(8)
 C3–C4–C9–C8 − 176.41(10) 70.74(11)
 C3–C4–C5–C6 173.04(10) − 68.60(1)
Lactam ring plane
 Max. deviation (C4) − 0.0299(10) 0.0208(9)
 Distance to O1 − 0.3384(19) − 0.2321(18)
 Distance to N1 0.4900(16) 0.3764(14)
 Distance to C2 0.7795(19) 0.6460(19)