title: cis,trans,cis,cis-7-tert-Butyl-dimethyl-silyl-oxy-4,10-dimethyl-tetra-cyclo[5.4.1.0.0]dodecan-2-one.
abstract: In the structure of the title compound, C(20)H(34)O(2)Si, a cis,trans,cis,cis-[4.5.5.5]fenestrane derivative, the geometry of the central C(C)(4) substructure shows considerable distortion from an ideal tetra-hedral arrangement towards planarity, with two opposite bridgehead bond angles of 128.87 (18) and 122.83 (17)°. The other bridgehead angle of the trans-bicyclo-[3.3.0]octane subunit is also large [126.57 (19)°].
authors.forename: Philipp
authors.initials: P
authors.lastname: Weyermann
authors.forename: Reinhart
authors.initials: R
authors.lastname: Keese
authors.forename: Helen
authors.initials: H
authors.lastname: Stoeckli-Evans