Poly(ether ketone ether ketone ketone) containing meta phenylene linkage(PEKEKmK) was synthesized from 4,4′ diphenoxybenzophenone and isophthaolyl chloride by electrophilic polycondensation and characterized by IR, D...Poly(ether ketone ether ketone ketone) containing meta phenylene linkage(PEKEKmK) was synthesized from 4,4′ diphenoxybenzophenone and isophthaolyl chloride by electrophilic polycondensation and characterized by IR, DSC, TGA and WAXD. The crystallization of the PEKEKmK has been carried out under different conditions: melt crystallization, cold crystallization and solvent induced crystallization and the following order of crystallinity was obtained: W cx,melt > W cx,cold > W cx,sic .展开更多
Regioselective （site selective） control is one of the major aims of research directed towards the development of novel organic methodologies. Regioselective control is especially important for C-H activation reactio...Regioselective （site selective） control is one of the major aims of research directed towards the development of novel organic methodologies. Regioselective control is especially important for C-H activation reactions because most organic compounds contain a large number of C-H bonds and it can therefore be difficult to differentiate between similarly reactive C-H bonds. Traditional approaches for controlling the regiose- lectivity of C-H activation reactions involve the use of an ortho directing group,展开更多
文摘Poly(ether ketone ether ketone ketone) containing meta phenylene linkage(PEKEKmK) was synthesized from 4,4′ diphenoxybenzophenone and isophthaolyl chloride by electrophilic polycondensation and characterized by IR, DSC, TGA and WAXD. The crystallization of the PEKEKmK has been carried out under different conditions: melt crystallization, cold crystallization and solvent induced crystallization and the following order of crystallinity was obtained: W cx,melt > W cx,cold > W cx,sic .
文摘Regioselective （site selective） control is one of the major aims of research directed towards the development of novel organic methodologies. Regioselective control is especially important for C-H activation reactions because most organic compounds contain a large number of C-H bonds and it can therefore be difficult to differentiate between similarly reactive C-H bonds. Traditional approaches for controlling the regiose- lectivity of C-H activation reactions involve the use of an ortho directing group,
