Organolead hydrides stability

Radical formers as catalysts were of no help they mostly accelerated the decomposition of Bu3PbH. Also catalysis by aluminum alkyls 189,201), used for the addition of organotin hydrides to olefins, is not useful because the transfer of an alkyl group to RjPbH depends upon the necessary addition of R2AIH to the olefin 189, 284) at 20° C (which is the limit for the stability of the organolead compounds used) and this does not take place. 

Borohydrides ii and aluminohydrides2i2 react with organolead halides to form the hydrides RsPbH and R2PbH2, but due to the very low thermal stability of the products, such reactions must be carried out at very low temperatures. 

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