Dear all I think I have found something. It is a dmg that installs latex2rtf (I think it was missing from my distribution). You will find it here.
http://www.tug.org/pipermail/macostex-archives/2010-April/043664.html I have to experiment on complex files, with bibtex entries and the like, but this seems to work smoothly now. Am I the only one to have experimented such problems? If it is frequent, I'll be glad to contribute to the wiki and point to this workaround. Best MG