3-(tert-Butyloxycarbonylamino)bicyclo

In the room-temperature X-ray structure of the N-Boc-protected derivative of the novel 3-aminobicyclo[1.1.1]pentanecarboxylic acid, C(11)H(17)NO(4), the interbridgehead distance in the bicyclo[1.1. 1]pentane cage is 1.852 (2) A. The carboxyl and parts of the blocked amino group are almost in plane with one of the cage triangles. N-H. O and O-H.O hydrogen bonds generate infinite corrugated molecular chains in the crystal lattice.