3 u00d7 the combined organics were washed with brine dried na 2 so 4 filtered and concentrated in vacuo purification of the residue by flash column chromatography silica gel 100 etoac gave 5 3 mg 11 of the above titled compound isopropyl p tolyltriazene 200 u03bcl was added dropwise to a solution of carboxylic acid 9 10 5 mg 0 026 mmol in acetone 5 0 ml at 23 u00b0 c after stirring for 1 h the reaction was quenched with 1n hcl and the solvent was removed in vacuo the residue was extracted with ch 2 cl 2 2 u00d7 the combined organics were dried na 2 so 4 filtered and concentrated in vacuo purification of the residue by flash column chromatography silica gel 4 1 hex etoac gave 4 3 mg 38 of the above titled compound the named compound is prepared by substituting tert butyl e 3 iodo 1 2 naphthalen 2 yl ethyl allyloxy dimethylsilane for tert butyl s 1 e 2 iodovinyl hexyloxy dimethylsilane in the method of example 4 fcc gives a higher rf compound and a lower rf compound designated as h and l respectively the named compound is prepared by repeating the method of example 5 with the named compound of example 8 h rather then the named compound of example 4 the named compound is prepared by repeating the method of example 5 with the named compound of example 8 l rather then the named compound of example 4 the named compound is prepared by repeating the method of example 6 with the named compound.