 This reaction may also be done intramolecularly to produce five- or six-membered silicon-containing rings fused to a phenyl ring.In addition, tributylsilane can be converted into the corresponding cyclic organosilane via the same process.A drawback to this catalyst, however, is that it requires rather harsh reaction conditions (typically 200 °C for 24 hours for the intermolecular reaction, 48 – 72 hours for the intramolecular ones).