I. Ryu et al., STANNYLFORMYLATION OF 1,6-DIENES ACCOMPANIED BY 5-MEMBERED RADICAL RING-CLOSURE, Journal of organic chemistry, 59(25), 1994, pp. 7570-7571
Treatment of 1,6-dienes with tin hydride and AIBN (catalytic) under CO
pressure leads to five-membered carbocycles flanked by stannylmethyl
and formylmethyl groups at the adjacent carbons by way of a stannyl ra
dical addition-cyclization-carbonylation sequence.