The carbene transfer to strong Lewis acids: copper is better than silver†
Vladimir N.
Mikhaylov, 
a
Igor V.
Kazakov,
a
Tatiana N.
Parfeniuk,
a
Olesya V.
Khoroshilova,
a
Manfred
Scheer,
b
Alexey Y.
Timoshkin
*a
and
Irina A.
Balova
*a
a
Igor V.
Kazakov,
a
Tatiana N.
Parfeniuk,
a
Olesya V.
Khoroshilova,
a
Manfred
Scheer,
b
Alexey Y.
Timoshkin
*a
and
Irina A.
Balova
*a
Abstract
A new convenient approach to the synthesis of useful N-heterocyclic carbene complexes of group 13 metals was successfully developed. We demonstrate that air-stable copper(I) diaminocarbene complexes are excellent carbene transfer reagents for the synthesis of (IMes or IPr)MCl3 with high yields (M = Al, Ga). Use of this simple method allowed for the first time to obtain (IPr)AlCl3, inaccessible via a free carbene route. In contrast to copper complexes, under the same conditions the more commonly used silver analog (IPr)AgCl reacts with MCl3 (M = Al, Ga, In) yielding only the homoleptic cationic complexes [(IPr)2Ag]+MCl4−.
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