Patent ID: 7589218
Filing Date: 2009-09-15
Classification: C07C,C07D,C07F

Abstract:
1. A process for the preparation of a spirobixanthenonediol ligand represented by the following formula: or a ring-substituted derivative thereof, said process comprising the steps of: contacting a compound represented by the following formula: or a ring-substituted derivative thereof with n-BuLi and thereafter with a compound represented by the following formula: wherein said contacting is carried out at a temperature and length of time sufficient to produce a xanthenol compound represented by the following formula: or a ring-substituted derivative thereof; contacting said xanthenol compound or a ring-substituted derivative thereof and a mixture of concentrated hydrochloric acid and acetic acid at a temperature and length of time sufficient to produce a dimethoxy spirobixanthene compound of the following formula: or a ring-substituted derivative thereof; and contacting said dimethoxy spirobixanthene compound or a ring-substituted derivative thereof and pyridine hydrochloride at a temperature and length of time sufficient to produce said spirobixanthenonediol compound.