A method for preparing oxyborane compounds of formula (I): using carbon dioxide, and the use of the oxyborane compounds obtained in this way for preparing methane derivatives, in particular oxygenated, halogenated or amino derivatives of methane. The methane derivatives obtained in this way can then be used in the production of vitamins, pharmaceutical products, glues, acrylic fibers and synthetic leathers, pesticides, and fertilizers, for example. Also provided is a method for producing vitamins, pharmaceutical products, glues, acrylic fibers, synthetic leathers, pesticides, and fertilizers, for example, including a step of preparing methane derivatives, in particular oxygenated, halogenated or amino derivatives of methane, from oxyborane compounds obtained by the method according to the invention. Further provided is a method of preparing labelled oxyborane compounds and the use of same.