alkynylthiol carbonylalkenyl alkylthiol carbonylalkynyl alkenylthiol carbonylalkynyl alkynylthiol carbonylalkynyl alkoxyiminoalkyl alkenoxyiminoalkyl alkynoxyiminoalkyl alkoxyiminoalkenyl alkenoxyiminoalkenyl alkynoxyiminoalkenyl alkynoxyiminoalkynyl alkenoxyiminoalkynyl alkynoxyiminoalkynyl alkylaminoiminoalkyl alkenylaminoiminoalkyl alkynylaminoiminoalkyl alkylaminoiminoalkenyl alkenylaminoiminoalkenyl alkynylaminoiminoalkenyl alkylaminoiminoalkynyl alkenylaminoiminoalkynyl alkynylaminoiminoalkynyl alkylthioliminoalkyl alkenylthioliminoalkyl alkynylthioliminoalkyl alkylthioliminoalkenyl alkenylthioliminoalkenyl alkynylthioliminoalkenyl alkylthioliminoalkynyl alkenylthioliminoalkynyl alkynylthioliminoalkynyl alkoxy thiocarbonyl alkyl alkenoxy thiocarbonyl alkyl alkynoxy thiocarbonyl alkyl alkoxy thiocarbonyl alkenyl alkenoxy thiocarbonyl alkenyl alkynoxy thiocarbonyl alkenyl alkoxy thiocarbonyl alkynyl alkenoxy thiocarbonyl alkynyl alkynoxy thiocarbonyl alkynyl alkylamino thiocarbonyl alkyl alkenylamino thiocarbonyl alkyl alkynylamino thiocarbonyl alkyl alkylamino thiocarbonyl alkenyl alkenylamino thiocarbonyl alkenyl alkynylamino thiocarbonyl alkenyl alkylamino thiocarbonyl alkynyl alkenylamino thiocarbonyl alkynyl alkynylamino thiocarbonyl alkynyl alkylthiol thiocarbonyl alkyl alkenylthiol thiocarbonyl alkyl alkynylthiol thiocarbonyl alkyl alkylthiol thiocarbonyl alkenyl alkenylthiol thiocarbonyl alkenyl alkynylthiol thiocarbonyl alkenyl alkylthiol thiocarbonyl alkynyl alkenylthiol thiocarbonyl alkynyl and alkynylthiol thiocarbonyl alkynyl wherein alkyl alkenyl alkynyl and the alkyl alkenyl and alkynyl portions of alkoxy alkenoxy alkynoxy alkylamino alkenylamino alkynylamino alkylthiol alkenylthiol or alkynylthiol independently have from 0 to about 20 carbon atoms wherein i one or more carbon atoms having one or more bound hydrogen atoms i e hydrogen radicals are optionally substituted with a monovalent radical independently selected from alkyl having 1 3 carbon atoms alkenyl having 1 3 carbon atoms alkynyl having 1 3 carbon atoms hydroxy and alkyoxy having 1 3 alkyl carbon atoms ii one or more carbon atoms having two or more bound hydrogen atoms are optionally substituted with a divalent radical independently selected from u2550 o u2550 s and u2550 nh and iii one or more methylene carbon atoms u2014 ch 2 u2014 are optionally replaced by a divalent radical independently selected from u2014 o u2014 u2014 nh u2014 or u2014 s u2014 in the preferred linker portions described above when alkyl alkenyl or alkynyl have 0 carbon atoms the linker is bonded via a carbonyl carbon atom.