作者:Robert S. Atkinson、John Fawcett、Michael J. Grimshire、David R. Russell
DOI:10.1039/c39850000544
日期:——
Analysis of the n.m.r. spectra of azirines (5)–(8) together with the X-ray crystal structure of (7) reveals that a requirement for near-coplanarity of three bonds at the spiro centre results in conformational anchoring of the five-membered ring.
Conformational analysis of spiro- and ring-fused azirines
作者:Robert S. Atkinson、Michael J. Grimshire
DOI:10.1016/s0040-4039(00)98746-x
日期:1985.1
The azirines (6) and (7) are shown to be anchored in solution in the conformations shown: it is suggested that these and the envelope conformations in (1)–(4) are stabilised by an interaction between the quinazolone nitrogen (N-3) p-orbital and a (bonded) p-orbital on the adjacent azirine carbon atom (the spiro-centre in (1)–(4) and (6)).