Ein einfacher Weg zu neuartigen Borhaltigen Spiroverbindungen

A Simple Route to a New Type of Boron‐containing Spirocompounds The reaction of enolizable 1,3‐dicarbonyl compounds 6 with diol compounds 5 and boric acid results in a new typ of boron‐containing spiro‐compounds 10 . By using different substituted 5 and 6 more than 40 new spiroboronates 10 have been prepared and characterized by means of spectroscopic and analytical data.