title: tert-Butyl 4-(2-diazo-acet-yl)piperazine-1-carboxyl-ate.
abstract: The title crystal structure, C(11)H(18)N(4)O(3), is the first diazo-acetamide in which the diazo-acetyl group is attached to an N atom. The piperazine ring is in a chair form and hence the mol-ecule has an extended conformation. Both ring N atoms are bonded in an essentially planar configuration with the sum of the C-N-C angles being 359.8 (2) and 357.7 (2)°. In the crystal structure, the O atom of the diazo-acetyl group accepts two H atoms from C-H donors, thus generating chains of weak hydrogen-bonded R(2) (1)(7) rings.
authors.affiliation: Department of Chemistry, University of Oslo, PO Box 1033 Blindern, N-0315 Oslo, Norway.
authors.forename: Asmund
authors.initials: A
authors.lastname: Kaupang
authors.forename: Carl Henrik
authors.initials: CH
authors.lastname: Görbitz
authors.forename: Tore
authors.initials: T
authors.lastname: Hansen