aldehyde group
6.The scaling property of a new type magnetic colloid root canal filling matcrial(NMC) at the apex was abscrvcd by dye-permeating method. Results showed the mean dye-permeating length of NMC group was 2. 41mm, that of phenolic aldehyde group was 2.94mm, and no significnat difference between these two groups(p>0.05);
8.With ester (+)- 27 in hand, the vinyl group was next converted to the aldehyde moiety via ozonolysis, employing reduction of the ozonide with dimethylsulfide or PPh 3 , followed by treatment with DBU in THF to effect epimerization; aldehyde (+)- 29 was produced in a combined yield of 65% for the two steps.
