Summary: Hexamethylditin adds readily to allenes in the presence of Pd (PPh3),; unsymmetrically substituted allenes undergo kinetically controlled addition at lower temperatures, while at higher temperatures the thermodynamically more stable products are formed.
![Stannane, [1,4-bis(methylene)-1,4-butanediyl]bis[trimethyl Structure](https://image.chemsrc.com/caspic/248/90886-28-5.png)