Polyfluoro-compounds based on the cycloheptane ring system. Part 4. Reactions of nucleophiles with dodeca- and with 1H-undeca- fluorocyclohept-1-ene; decafluorocycloheptyne as a reactive intermediate
作者:ABD E.M.M. Khalil、Robert Stephens、John Colin Tatlow
DOI:10.1016/s0022-1139(00)81110-0
日期:1983.2
gave decafluoropimelic acid. This is clear evidence for exchange of hydrogen by lithium in the starting olefin, followed by loss of lithium fluoride, to give decafluoro-cycloheptyne as a transient intermediate.
十二氟环庚烯将其乙烯基氟与亲核试剂交换;得到1H-十一碳-和1H,2H-十氢-(含硼氢化钠)和1-甲基十一碳和1,2-二甲基十-氟环庚烯(含甲基锂)。没有检测到异构产物。1甲基十一碳氟环庚烯和氢化铝锂得到1H-2-甲基十氟环庚-1-烯。十二氟环庚烯和氨产生了少量的1-氨基-十一氟环庚烯和1-氨基-3-亚氨基壬基氟环庚-1-烯,后者易于水解为3-一。1H-十一氟环庚-1-烯不能简单地用甲基锂加成-消除。通常将1,2-二甲基八氟环庚-1,3-二烯与1,2,4-三甲基七氟环庚-1,3-二烯分离,如果甲基锂过量的话。在呋喃存在下的甲基锂以良好的收率得到Diels-Alder加合物,8,11-环氧-2,2,3,3,4,4,5,5,5,6,6-十氟双环-[5.4,0] undeca-1(7),9(10)-服务。氧化得到十氟庚二酸。这清楚地证明了起始烯烃中的锂与氢交换了氢,然后损失了氟化锂,得到了十氟环庚炔作为过渡中间体。