Microwave assisted reaction with gas reagents

Controlled microwave heating has found many important applications in organic synthesis. Almost all kinds of reactions have been tested using microwaves. Major successes in carrying out rapid organic transformations have been achieved when high temperatures are required and substrates or reagents do not survive to prolonged heating. On the other hand, very few reports deal with the use of gas as reagent inside a microwave oven, even though many organic transformations that employs gas are carried out under heating and could take advantage of the use of microwaves. This review collects all the contributions reported until now on microwave-assisted reaction using gas reagents. Except for a few examples, all the reactions selected have been carried out using R commercially available instruments for synthesis with minor modifications.