Abstract: The present invention relates to a process for the preparation of vincristine.The process for the semisynthesis of vincristine according to the present invention comprises oxidizing vinblastine or its salts with chromic acid or its salts, in ethyl acetate at a low temperature.

Abstract: The invention concerns halo-biphenyl tertiary alcohols of the general formula: ##STR1## in which: X is chlorine or bromine in ortho or meta position.R and R.sub.1, which may be identical or different, represent an alkyl group of low molecular weight having from 1 to 4 carbon atoms, inclusive.These new derivatives are useful as medicaments, particularly in the treatment of atherosclerosis and obesity.

Abstract: The present invention relates to new 2-(arylalkyloxymethyl)morpholine derivatives, the preparation thereof and their application as drugs which are useful in the treatment of disorders of the central nervous system.The 2-(arylalkyloxymethyl)morpholine derivatives according to the invention correspond to the general formula (I): ##STR1## in which: Ar denotes an aromatic group and more especially the following radicals: ##STR2## in the case where Ar denotes a phenyl radical and R denotes a hydrogen atom, an alkyl, alkoxy or halogen group, a trifluoromethyl radical, a nitro or amino group, a hydroxy group or an arylalkyloxy group.