prov:value
| - The compound of claim 5 wherein R is an aromatic group selected from perchlorophenylene. phenylene, biphenylene, naphthylene, dichlorophenylene, nitrophenylene, p,p'(2,2-diphenylene propane); p,p'-(2,2-diphenylene-1,1,1,3,3,3 hexafluoropropane), biphenylene; phenylene; 9,9'-diphenylfluorene, oxydiphenylene; thiodiphenylene; 2,2-diphenylene propane; 2,2'-diphenylene, 1,1,1,3,3,3-hexafluoropropane;
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