http://reply.papertrans.cn/3/238/23779/23779-31.png
Submitted on: 10 February 2001.
Revised on: 24 February 2001.
Accepted on: 22 March 2001.
Organic Chemistry Frontiers---ROYAL SOC CHEMISTRY
Submitted on: 04 October 2013.
Revised on: 07 November 2013.
Accepted on: 20 November 2013.
Organic Chemistry Frontiers---ROYAL SOC CHEMISTRY
http://reply.papertrans.cn/3/238/23779/23779-34.png
http://reply.papertrans.cn/3/238/23779/23779-35.png
http://reply.papertrans.cn/3/238/23779/23779-36.png