Valence-bond isomer chemistry. Part 13. Photochemical oxidation of hexafluorobenzene: formation of hexafluoro-3-oxatricyclo[3.2.0.02,4]hept-6-ene and its reactions
作者:Michael G. Barlow、Colin J. Peck
DOI:10.1016/s0022-1139(00)80429-7
日期:1993.3
Vapour-phase ultraviolet irradiation of hexafluorobenzene in the presence of oxygen slowly yields hexafluoro-3-oxatricyclo[3.2.0.02,4]hept-6-ene (2) (10%). The CFCF bond in 2 adds (yields of adducts given) the dienes; cyclopentadiene (74%), furan (61%) and 2,5-diphenylisobenzofuran (59%); benzonitrile oxide (58%); chlorine (59%) and bromine (71%) photochemically. Heptene 2 isomerises thermally to
在氧气的存在下,对六氟苯进行蒸汽相紫外线照射会缓慢产生六氟-3-氧杂三环[3.2.0.0 2,4 ]庚-6-烯(2)(10%)。在CFCF键2添加二烯(给定的加合物的产率); 环戊二烯(74%),呋喃(61%)和2,5-二苯基异苯并呋喃(59%); 氧化苄腈(58%); 氯(59%)和溴(71%)进行光化学处理。庚烯2在50°C下热异构化为六氟环己2,4-二烯酮(6)(60%),并在室温下与乙醚反应,生成氟化乙基(89%)和2-乙氧基五氟环己二2,5-二烯酮(21) %)。在440°C下进行热解后,苄腈氧化物加合物生成异构体oxepin衍生物和环己二酮6,接触时间更长。氯加合物类似地产生二氯-氧杂庚烯衍生物。尝试将其脱氯为六氟-环氧丙烷的尝试均未成功。氧化苄腈增加了六氟双环[2.2.0] hexa-2,5-二烯的音调或两个CC键;1:1的加合物热异构化为苯甲腈-六氟苯加合物。