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Hydroformylation is a powerful reaction that has suffered for some negative prejudices related to the use of gaseous H-2 and CO. Now it is possible to carry out hydroformylation and different cyclohydrocarbonylations, even on complex substrates, using aqueous formalin as H-2 and CO surrogate in few minutes under microwave irradiation. The catalytic system developed by Morimoto (Rh/BINAP for decomposition of formaldehyde and Rh/Xantphos for hydroformylation) is compatible with microwave dielectric heating and with complex substrates containing ligand atoms allowing rapid domino hydroformylation cyclization reactions without using the external supply of gaseous H-2 and CO (gas cylinder) and without any particular safety limitation or device.
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Taddei et al. (2010) studied this question.
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