Thanks!
Do u think that Cadmiun could be better than magnesium in such reaction?
Like forming first the cadmiun derivative:
R-CH2Br + Cd ----> R-CH2CdBr
and then reacted it with for example:
R-OMs + RCH2CdBr -----> R-CH2-R + MsOCdBr
It is mesylate a good leaving group for this case?