File Name : figure s1.tif

Caption : 1hnmr spectrum of ed2 

File Name : figure s2.tif

Caption : figure s2. 13c{1h}nmr spectrum of ed2

File Name : figure s3.tif

Caption : figure s3. 1hnmr spectrum of ed3 

File Name : figure s4.tif

Caption : figure s4. 13c{1h}nmr spectrum of ed3 

File Name : figure s5.tif

Caption : figure s5. 1h nmr spectrum of ed4 

File Name : figure s6.tif

Caption : figure s6. 13c{1h} nmr spectrum of ed4