3-(tert-butyl-diphenyl-silanyloxy)-5-hydroxy-2-trityloxymethyl-cyclopentanone

4-(tert-butyl-diphenyl-silanyloxy)-2-methylene-3-trityloxymethyl-cyclopentanol

9-[4-(tert-butyl-diphenyl-silanyloxy)-2-methylene-3-trityloxymethyl-cyclopentyl]-6-chloro-9H-purine-2-yl amine

2-trityloxymethyl-cyclo-2-pentenol

tert-butyl-diphenyl-(2-trityloxymethyl-cycIo-2-pentenyloxy)-silane