@article{HegmannChristlPetersetal.1987,
  author    = {Hegmann, J. and Christl, Manfred and Peters, K. and Peters, E.-M. and Schnering, H. G. von},
  title     = {Intramolekulare [2+2]-Cycloadditionen von γ-Oxoketenen},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-58384},
  year      = {1987},
  abstract  = {The 1-oxoketenes, which are accessible from methyl 1,3,4-oxadiazin-6-one-2-carboxyIate 1 and cycloalkenes, are shown to undergo an intramolecular [2+2] cycloaddition either on heating or on photolysis to give different sterecisemers of ß-lactones of the 3-oxo-2-oxabicyclo[ 2.2.0]hexane-type.},
  subject      = {Organische Chemie},
  language  = {de}
}
@article{ChristlHegmannReuchleinetal.1987,
  author    = {Christl, Manfred and Hegmann, J. and Reuchlein, H. and Peters, K. and Peters, E.-M. and Schnering, H. G. von},
  title     = {{\"U}berbr{\"u}ckte neungliedrige α,β-unges{\"a}ttigte Enollactone - Synthese aus 5-Phenyl-1,3,4-oxadiazin-6-on-2-carbons{\"a}ure-methylester und Konfigurationsanalyse},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-58395},
  year      = {1987},
  abstract  = {The γ-oxoketenes, which are formed from oxadiazinone Ja and strained cyclopentene der1vat1ves, are shown to undergo a pericyclic ring enlargement to give the title compounds 2a, 2b, and 5. In the case of 5, two configurations, one having a cis and the other a trans Iactone functionality, are in equilibrium.},
  subject      = {Organische Chemie},
  language  = {de}
}