Frustrated Lewis pair adducts of alkynyl-capped tetrelenes†
Abhishek V.
Muralidharan, 
a
Brandon L.
Frenette,
a
Julius
Wicke,
b
Alvaro A.
Omaña,
a
Michael J.
Ferguson
a
and
Eric
Rivard
*a
a
Brandon L.
Frenette,
a
Julius
Wicke,
b
Alvaro A.
Omaña,
a
Michael J.
Ferguson
a
and
Eric
Rivard
*a
Abstract
The frustrated Lewis pair (FLP) adducts PB{ECl2} (PB = iPr2P(C6H4)BCy2; Cy = cyclohexyl; E = Si, Ge) were used to access a bis(alkynyl)-functionalized silylene and a germylene; the goal behind preparing these species was to obtain new unsaturated main group polymers [E(C![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
CSiMe3)2]n upon heating. While the silylene adduct PB{Si(CCSiMe3)2} was stable up to 150 °C, the heavier element congener PB{Ge(CCSiMe3)2} underwent a complicated rearrangement process accompanied by Cy-group migration and Ge(II)-alkyne coordination. Density functional theory computations were performed to understand the mechanistic pathway for the unusual rearrangement of PB{Ge(CCSiMe3)2}.
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