A cyclisation of 1-bromo-5,5,10,10-tetraethoxycarbonyl-2,7-decadiyne (9b) using NaH in dilute solution gives 1,1,6,6-tetraethoxycarbonyl-cyclodeca-3,8-diyne (8) in 17,6% yield. 9b is prepared by condensation of 1,1,6,6-tetraethoxycarbonyl-3-hexyne with 1,4-dibromo-2-butyne.
在稀溶液中使用NaH将1-
溴5,5,10,10-四乙氧基羰基-2,7-癸二炔(9b)环化,得到1,1,6,6-四乙氧基羰基-cyclodeca-3,8-二炔(8),收率为17.6%。9b是通过将1,1,6,6-四乙氧基羰基-
3-己炔与
1,4-二溴-2-丁炔缩合制备的。