N. Takeda et al., A novel reaction mode in the cycloaddition of thermally generated silylenes with conjugated dienes, CHEM LETT, (6), 2000, pp. 622-623
A thermally generated silylene bearing bulky substituents, Tbt(Mes)Si: (Tbt
= 2,4,6-tris[bis(trimethylsilyl)methyl] phenyl; Mes = 2,4,6-trimethylpheny
l), reacted with isoprene at room temperature to give the corresponding 2-v
inylsilirane, which thermally isomerized to the corresponding 3-silolene, w
hile silylene underwent competitive [1+2] and [1+4] cycloadditions with 2,4
-dimethyl-1,3-butadiene.