Preparation of spirobiindane bisphenol bischloroformate compositions.

摘要

Bischloroformate compositions are prepared from spirobiindane bisphenols by phosgenation in a substantially inert organic liquid in a two-step reaction. The pH during the first step is maintained in the range of about 8-14 by addition of aqueous base. In the second step, the pH is in the range of about 2-6. This method produces compositions containing a substantial amount of monomeric bischloroformate and avoids gelling problems.