No care needs to be taken in terms of storage of the caged phosphine as it is both air and moisture stable. The phosphine itself has shown unprecedented regioselectivity and activity in the hydroformylation of unsaturated esters. It is important to perform the reaction in an efficient fumehood as phenylphosphine has a very pungent odour. It is important also to obey good schlenk techniques as phenylphosphine will ignite in air. Phenylphosphine is generally obtained in glass ampules that should be cracked open under a funnel of argon and transferred to a clean dry Young’s flask via syringe and stored under argon out of direct sunlight. Any glassware and other items that come into contact with the phosphine should be thoroughly rinsed with iodine/methanol solution until decolourisation ceases.