Qualitative Reasoning: Modeling and Reasoning with Incomplete Knowledge

Benzazasilin-4-ones of the formula (I) where R1 represents H or alkyl of 1-5 carbon atoms, R2 represents alkyl of 1-5 carbon atoms, R3 represents alkyl of 1-5 carbon atoms or where R5 represents H, alkyl of 1-5 carbon atoms, halo having an atomic weight of about 19-36, alkoxy having 1-5 carbon atoms, or where R6 and R7 each, independently, represent alkyl having 1-2 carbon atoms, and R4 represents alkyl having 1-3 carbon atoms, e.g., 1-(p-chlorophenyl)-2,3-dihydro-1,3-dimethyl-3,1-benzazasilin-4(1H)-one, are prepared from the appropriate lithiated N-alkyl benzamide and a halomethyl halosilane and are useful as antiobesity agents or sleep inducers.