Thiophene-containing potentially neuroleptic rigid spiroamines. III. On the synthesis of 2-chloro-8,9-dihydro-N,N,6-trimethylspiro[4H-cyclohepta[1,2-b;4,5-b']dithiophene-4,1'-[2]cyclohexen]-4'-amine and its 2',3'-dihydro derivative.