HCID 11789423, Verbindung → HCID 20197995, Verbindung

When m is 0, n is 2 or p is 3, the ring system is a 2-oxabicyclo[3.3.1]nonane, another subclass of the invention. For example, a compound of subclass XVI of formula XVIp below ##STR31## in which R2, R5 and R6 are methyl in formula 1 can be prepared by treating 3-methyl-3-acetoxycyclohex-1-ene with a malonic ester in the presence of palladium(II), the resulting cyclohexene diester is hydrolyzed, decarboxylated, and treated with methyl Grignard reagent. The resulting cyclohexenylalkanol is epoxidized and cyclized to yield the 2-oxabicyclo[3.3.1]nonan-9-ol, which is treated with WCH2X in which X is halogen to yield the desired ether XVIp. Alternatively, 3-methyl-2-cyclohexen-1-carboxylic acid is converted to 3-methyl-2-cyclohexen-1-acetic acid by methods analogous to those of the literature and described for compounds of formula XIp, the resulting acid is treated with methyl Grignard, and the resulting alcohol is subjected to epoxidation-cyclization to yield 2-oxabicyclo[3.3.1]nonan-9-ol.