of the protective groups represents a silyl radical when g 1 represents a ch 2 ph or where appropriate a benzyloxymethyl radical the replacement of the protective groups g 2 and where appropriate r 39 4 by hydrogen atoms is performed first under the conditions described above to obtain the product of general formula str13 in which r ar and r 4 are defined as above the ph ch 2 or where appropriate the benzyloxymethyl group of which is replaced by a hydrogen atom to obtain the product of general formula xi the replacement of the ph ch 2 or where appropriate the benzyloxymethyl group of the product of general formula xiv by a hydrogen atom is generally performed by hydrogenolysis by means of hydrogen in the presence of a catalyst such as palladium black working in an organic solvent such as acetic acid at a temperature of between 0 and 60 u00b0 c and preferably in the region of 40 u00b0 c it can be advantageous to work under pressure and optionally in the presence of a catalytic amount of an acid such as perchloric acid the same replacement is also performed by the action of dichlorodicyanobenzoquinone ddq in an organic solvent such as dichloromethane or acetonitrile the taxane derivatives of general formula xi thereby.