Chelated complexes of paramagnetic metals with low toxicity
申请人:BRACCO S.p.A.
公开号:EP0872479B1
公开(公告)日:2002-09-04
US6149890A
申请人:——
公开号:US6149890A
公开(公告)日:2000-11-21
US6177562B1
申请人:——
公开号:US6177562B1
公开(公告)日:2001-01-23
USRE38329E1
申请人:——
公开号:USRE38329E1
公开(公告)日:2003-11-25
Assessing the Rates of Ring-Opening of Aziridinium and Azetidinium Ions: A Dramatic Ring Size Effect
作者:Nicolas De Rycke、Olivier David、François Couty
DOI:10.1021/ol200348k
日期:2011.4.1
Rates for the ring-opening of aziridinium and azetidiniumions by DMAP were measured. The four-membered ring appears to be ca. 17 000 times less reactive compared to the three-membered ring but is still highly relevant from a synthetic viewpoint. The electrophilicity of these strained ammonium ions is measured for the first time.