Flash vacuum pyrolysis of 1,6-diphenyl-1,5-hexadien-3-ynes: tandem diaryldienyne cyclizations to form chrysene
作者:Motohiro Sonoda、Kayo Itahashi、Yoshito Tobe
DOI:10.1016/s0040-4039(02)01062-6
日期:2002.7
Flashvacuumpyrolysis of 1,6-diphenyl-1,5-hexadien-3-yne at 1000°C and its bromo derivative at 800°C yielded chrysene as the major product through tandem diaryldienyne cyclizations.
Stereoselective Syntheses of (<i>E</i>)- and (<i>Z</i>)-1-Arylalk-3-en-1-ynes and (<i>E,E</i>)-, (<i>Z,E</i>)-, (<i>E,Z</i>)-, and (<i>Z,Z</i>)-Alka-1,5-dien-3-ynes via a One-Pot Multicomponent Coupling Reaction
(Z)-1-arylalk-3-en-l-ynes. In addition, the reactions with (E)- and (Z)- 1-iodoalk-1-enes have accomplished the construction of all possible combinations of geometrical isomers, (E,E)-, (Z,E)-, (E,Z)-, and (Z,Z)- alka-1,5-dien-3-ynes.
PALLADIUM-CATALYZED CROSS-COUPLING OF ORGANOLEAD(IV) TRIACETATES WITH TERMINAL ALKYNES
作者:Suk-Ku Kang、Hyung-Chul Ryu、Sang-Ho Lee
DOI:10.1081/scc-100103537
日期:2001.1
The palladium-catalyzed carbon-carbon bond formation of organolead(IV) triacetates with terminalalkynes was accomplished with Pd2(dba)3·CHCl3 (5 mol%) and CuI (10 mol%) in the presence of NaOMe (2 equiv.) in MeOH/CH3CN (1:1) at room temperature.
precatalyst and tBuNH2 as the cocatalyst. This catalyst system provides an efficient and atom-economical access to unsymmetrical (E,E)-1,4-diarylbutadienes with high yields and stereoselectivities. Monitoring the process revealed that a sequence of cis-semihydrogenation of the triple bond of 1,3-enynes (to form (E,Z)-butadienes) and (E,Z)-to-(E,E) isomerization occurs to form (E,E)-butadienes.
使用新的 (PCN)Ir 配合物作为预催化剂和t BuNH 2作为助催化剂,开发了以乙醇为氢源的 1,3-烯炔的反式半氢化反应。该催化剂体系以高产率和立体选择性提供了一种高效且原子经济地获得不对称 ( E , E )-1,4-二芳基丁二烯的途径。监测过程显示,1,3-烯炔的三键顺式半氢化(形成 ( E , Z )-丁二烯)和 ( E , Z ) 到-( E , E ) 异构化形成( , _E )-丁二烯。
Copper-Catalyzed Cross-Coupling of 1-Iodoalkynes with Organostannanes