Dibenzo[b,f]thiepin derivatives of the formula WHEREIN R, R1, R2, R3 and R4 are as hereinafter set forth, are described. The dibenzo[b,f]thiepins of the invention possess strong central depressant and neuroleptic properties and are therefore useful, for example, in the treatment of acute or chronic schizophrenia and also as tranquilizers.
1-{8 10,11-Dihydro-dibenzo{8 b,f{9 -thiepin-10-yl{9 -4-(alkynylalkyl)-piperazines