The present invention is related to novel processes for preparing anhydrous and hydrated forms of piperidine derivatives, polymorphs and pseudomorphs thereof of the formulas ##STR00001## which are useful as antihistamines, antiallergic agents and bronchodilators.
This is a continuation of application Ser. No. 09/803,476, filed Mar. 9, 2001 now abandoned, which is a continuation of application Ser. No. 09/213,161, filed Dec. 17, 1998, now abandoned, which is a continuation of application Ser. No. 08/815,641 filed Mar. 13, 1997, now abandoned, which is a continuation of application Ser. No. 08/439,673, filed May 12, 1995, now abandoned, which is divisional of Ser. No. 08/417,161, filed Apr. 11, 1995, now abandoned, which is a continuation-in-part of Ser. No. 08/245,731, filed May 18, 1994, now abandoned.
