Change of connectivity on catenane ring: ring expansion by annulation-ring scission sequence.
Change of connectivity on catenane ring: ring expansion by annulation-ring scission sequence.
复制标题
索链环上连通性的变化：通过环环断裂序列进行环扩张。
作者：
N. Watanabe;and Nobuhiro Kihara;T. Takata
[反应：见正文]。通过Diels-Alder反应和臭氧化反应，在不破坏互锁结构的情况下实现了环戊二烯的扩环。Diels-Alder反应的环化反应在环上引入了一个C4片段，而臭氧分解剪切了产生的双键以扩展顺丁烯二环。环-环断裂序列提供了一种在不破坏互锁结构的情况下改变环上连接性的一般方法。
[reaction: see text]. Ring expansion of a catenane without destruction of the interlocked structure was attained by Diels-Alder reaction followed by ozonolysis. Annulation by Diels-Alder reaction introduced a C4 fragment onto the ring, and the ozonolysis scissored the resulting double bond to expand the catenane ring. The annulation-ring scission sequence provides a general approach for changing the connectivity on a catenane ring without destroying the interlocked structure.