@misc{KirsteBrietzkeHoldtetal.2019,
  author    = {Kirste, Matthias and Brietzke, Thomas Martin and Holdt, Hans-J{\"u}rgen and Schilde, Uwe},
  title     = {The crystal structure of 1,12-diazaperylene, C₁₈H₁₀N₂},
  series = {Postprints der Universit{\"a}t Potsdam Mathematisch-Naturwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam Mathematisch-Naturwissenschaftliche Reihe},
  number    = {752},
  issn      = {1866-8372},
  doi       = {10.25932/publishup-43650},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-436501},
  pages     = {3},
  year      = {2019},
  abstract  = {C₁₈H₁₀N₂, monoclinic, P2₁/c (no. 14), a=7.9297(9) {\AA}, b=11.4021(14) {\AA}, c=13.3572(15) {\AA}, β=105.363(8)°, V =1164.5(2) {\AA}³, Z =4, Rgt(F)=0.0325, wRref(F²)=0.0774, T =210(2) K.},
  language  = {en}
}
@misc{KruegerKellingLinkeretal.2019,
  author    = {Krueger, Tobias and Kelling, Alexandra and Linker, Torsten and Schilde, Uwe},
  title     = {Crystal structures of three cyclohexane‑based γ‑spirolactams},
  series = {Postprints der Universit{\"a}t Potsdam Mathematisch-Naturwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam Mathematisch-Naturwissenschaftliche Reihe},
  number    = {738},
  doi       = {10.25932/publishup-43491},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-434911},
  pages     = {9},
  year      = {2019},
  abstract  = {The title compounds, 2-azaspiro[4.5]deca-1-one, C₉H₁₅NO, (1a), cis-8-methyl-2-azaspiro[4.5]deca-1-one, C₁₀H₁₇NO, (1b), and trans-8-methyl-2-azaspiro[4.5]deca-1-one, C₁₀H₁₇NO, (1c), were synthesized from benzoic acids 2 in only 3 steps in high yields. Crystallization from n-hexane afforded single crystals, suitable for X-ray diffraction. Thus, the configurations, conformations, and interesting crystal packing effects have been determined unequivocally. The bicyclic skeleton consists of a lactam ring, attached by a spiro junction to a cyclohexane ring. The lactam ring adopts an envelope conformation and the cyclohexane ring has a chair conformation. The main difference between compound 1b and compound 1c is the position of the carbonyl group on the 2-pyrrolidine ring with respect to the methyl group on the 8-position of the cyclohexane ring, which is cis (1b) or trans (1c). A remarkable feature of all three compounds is the existence of a mirror plane within the molecule. Given that all compounds crystallize in centrosymmetric space groups, the packing always contains interesting enantiomer-like pairs. Finally, the structures are stabilized by intermolecular N-H···O hydrogen bonds.},
  language  = {en}
}