A new isopropenyl benzofuran-type tetramer was isolated from the roots of ligularia stenocephala and its structure was established by spectroscopic methods.
The photochromic spiropyrans and spirooxazine having a succinimidyl ester or isothiocyanate pendant group can form covalent products with transaminated DNA.The
KL molecular sieves with different framework compositions were secondarily synthesized by substituting Si for AI with a solution of (NH4)2SiF6. The internal te
p-1,1,3,3-Tetramethylbutylphenol was prepared by the alkylation of the phenol with Nafion catalyst in extremely high yield.Various reaction conditions were inve