| http://www.w3.org/ns/prov#value | - namines, arsines, stibenes, ethers, amines, amides, imines, sulfoxides, thioethers and pyridines; Y.sup.- is a non-coordinating anion, n is an integer in the range of from 0 to 5; ##STR7##wherein M.sup.2 is Mo or W, R.sup.4, R.sup.5 are, independently, hydrogen or a hydrocarbon selected from the group consisting of C.sub.2 -C.sub.20 alkenyl, C.sub.2 -C.sub.20 alkynyl, C.sub.1 -C.sub.20 alkyl, aryl
|
