The heavy alkaline earth elements calcium, strontium and barium react with two equivalents of N,N′-bis(2,6-diphenyl)formamidine (DippFormH) in the presence of bis(pentafluorophenyl)mercury to afford the bis(formamidinate) species [M(DippForm)2(THF)n]
(M = Ca, n
= 1 (1), M = Sr (2) or Ba (3), n
= 2) in good to moderate yield. Use of one equivalent of DippFormH during the preparation of 1–3 putatively results in the formation of the organoamide heavy alkaline earth Grignard species “[(X)M(DippForm)]”
(M = Ca, Sr or Ba, X = F or C6F5). These compounds participate in the nucleophilic substitution of the para-fluorine of pentafluorobenzene, a by-product of prior ligand exchange, to render DippForm(4-HC6F4).
You have access to this article
Please wait while we load your content...
Something went wrong. Try again?