438201-92-4Relevant academic research and scientific papers
The reactivity of phosphagermaallene Mes*P=C=Ge(t -Bu)tip toward aldehydes and ketones: An experimental and theoretical study
Ouhsaine,Andre,Sotiropoulos,Escudie,Ranaivonjatovo,Gornitzka,Saffon,Miqueu,Lazraq
, p. 2566 - 2578 (2010/08/05)
Phosphagermaallene Mes*P=C=Ge(t-Bu)Tip 1 (Tip = 2,4,6- triisopropylphenyl, Mes* = 2,4,6-tri-tert-butylphenyl) has been obtained by an improved synthesis in relation to the previously reported preparation starting from t-BuGeCl3. Very short Ge=C (1.761(2) A) and P=C (1.625(2) A) double bond lengths, trigonal planar geometry around the Ge atom, and GeCP bond angle of 166.57° are indicative of an heteroallenic structure for 1. Its reactions with crotonaldehyde and cinnamaldehyde lead to 1-oxa-2-germacyclobutanes by a [2 + 2] cycloaddition between the Ge=C and C=O double bonds; with methyl vinyl ketone, both a [2 + 4] cycloaddition between the Ge=C and the O=C-C=C moieties and an ene-reaction are observed leading to a 1-oxa-2-germacyclohex-5-ene and a germyl(butadienyl)ether, respectively. With acetophenone, an ene-reaction occurs to afford exclusively a germyl(vinyl)ether. DFT calculations have been performed to explain the regiochemistry observed.
The first stable 3,1-germaphosphaallene Tip(t-Bu)Ge=C=PAr
Harouch, Yamna El,Gornitzka, Heinz,Ranaivonjatovo, Henri,Escudié, Jean
, p. 202 - 208 (2007/10/03)
The first stable heteroallenic derivative with two heavy doubly-bonded Group 14 and 15 elements, the germaphosphaallene Tip(t-Bu)Ge=C=PAr 1 (Tip = 2,4,6-triisopropylphenyl, Ar = 2,4,6-tri-tert-butylphenyl), has been prepared in a nearly quantitative yield by dechlorofluorination of Tip(t-Bu)Ge(F)-C(C1)=PAr (obtained from ArP=CC12 and successive reaction with n-butyllithium and Tip(t-Bu)GeF2) with tert-butyllithium. 1 gives [2 + 2] cycloadducts by the Ge=C double bond with benzaldehyde, benzophenone and fluorenone to afford the corresponding germaoxetanes 11 - 13. 13 has been structurally characterized showing a long Ge-O bond (1.821(2) ?) and a slightly folded four-membered ring GeOCC (18.8° along C(1)Ge axis).
