Two novel acetylenic organoboranes—ethynyldichloro- and ethynyldifluoro-borane—have been prepared by photochemical and metathetical routes and characterized by i.r., mass spectrometry, and by chemical cleavage.
Addition of stannyl phosphines to alkynes and allenes
作者:Terence N. Mitchell、Heinz-Joachim Belt
DOI:10.1016/0022-328x(90)85241-p
日期:1990.4
Diphenyl(trimethylstannyl)phosphine adds to alkynes (both terminal and non-terminal) and allenes under free radical conditions. The former reaction occurs regiospecifically with preferential formation of E-isomers, the latter regioselectively. Product identification was based on NMR spectroscopic data. With one exception, addition to alkenes was not observed.
Silicon-, germanium- and tin-substituted acetylenes and their dicobalt hexacarbonyl complexes
作者:Dietmar Seyferth、David L. White
DOI:10.1016/s0022-328x(00)82641-8
日期:1971.11
number of Group IV element-substituted acetylenes have been prepared, including the new Me3SiCCSiMe2H, Me2HSiCCSiMe2H, Me3SiCCCMe3 and Me3SnCCCMe3. The dicobalt hexacarbonyl complexes of Me3SnCCSnMe3, Me3SnCCH, Me3GeCCGeMe3, Me3SnCCCMe3, Me3GeCCSiMe3 and Me3SnCCSiMe3 have been prepared by reaction of the appropriate acetylene with dicobaltoctacarbonyl. Reaction of (Me3SnC2H)Co2(CO)6 and (
‘Alk-l-ynyllead triacetates’ as alk-1-ynyl carbocation equivalents. The α-alk-1-ynylation of β-dicarbonyl compounds and nitronate salts
作者:Mark G. Moloney、John T. Pinhey、Eric G. Roche
DOI:10.1016/s0040-4039(00)85124-2
日期:1986.1
alk-l-ynyltrimethylstannane results in the rapid formation of trimethylstannyl acetate and an unstable species, believed to be the corresponding alk-l-ynyllead triacetate, which can effect the rapid α-alkynylation of β-dicarbonylcompounds and nitronatesalts.
1,1 -Organoboration of mono-1-alkynyltin compounds using dialkyl(N-azolyl) boranes-stepwise ring enlargement of boron heterocycles
作者:Bernd Wrackmeyer、Heidi E. Maisel、Bernd Schwarze、Wolfgang Milius、Roland Köster
DOI:10.1016/s0022-328x(97)00019-3
日期:1997.8
5-dimethylpyrrolyl (b), indolyl (c), carbazolyl (d)) stereospecifically by 1,1-organoboration to give organometallic-substituted alkenes 10–20, 22–25, with the trimethylstannyl and the boryl group in cis-positions at the C=C bond. These reactions proceed via an alkynylborate-like zwitterionic intermediate ZI, and exchange of the azolyl against the 1-alkynyl group may compete (Eq. (1)(b)) with the 1,1-organoboration
单-1- alkynyltin化合物1-4(ME 3的Sn-C≡CR 1 ; R 1 = H(1)中,Me(2)中,Ph(3),SnMe 3(4))与各种二烷基反应(ñ -偶氮基)硼烷5–9(偶氮基=吡咯基(a),2,5-二甲基吡咯基(b),吲哚基(c),咔唑基(d))通过1,1-有机取代立体定向生成有机金属取代的烯烃10–20,22–25,三甲基锡烷基和硼烷基在C = C键的顺式位置。这些反应通过类似炔基硼酸酯的两性离子中间体ZI进行,并且偶氮基与1-炔基的交换可能会与(1)(b))竞争与1,1-有机取代(方程(1)(a) )),具体取决于硼碳键的反应性和空间要求。还显示出,除了在化学计量比为1:1的反应中形成的产物外,其他产物还来自两当量的1与一当量的硼烷的反应。这些产物可以是1,3-丁二烯衍生物或通过烯丙基重排形成的丙二烯。所有产品的特征在于1 H,11 B,13 C和119Sn N