PROCESS FOR PREPARING PIPERIDYLIDENE DIHYDRO- DIBENZO[A,D,]CYCLOHEPTENES AND AZA DERIVATIVES THEREOF, COMPOUNDS OBTAINED BY SUCH PROCESS AND THE USE OF SUCH COMPOUNDS FOR PREPARING USEFUL PHARMACEUTICAL, COMPOSITIONS

摘要

Disclosed is an improved process for preparing unsubstituted or substituted dihydro-dibenzo¢a,d!cyclo-heptenes, azaderivatives thereof and the pharmaceutically acceptable salts of such compounds. A narrow group of compounds which possess antihistaminic properties with substantially no sedative properties and which are obtainable by the claimed process is also claimed.