Aumann R, Göttker-Schnetmann I, Fröhlich R, Saarenketo P, Holst C
Organisch-Chemisches Institut der Universität Münster, Germany.
Chemistry. 2001 Feb 2;7(3):711-20. doi: 10.1002/1521-3765(20010202)7:3<711::aid-chem711>3.0.co;2-5.
Reactions of NH-enaminones 2 with [2-(1-cycloalkenyl)ethynyl]carbene complexes 7 (M=W, Cr) gave tetrahydropentalenes, tetrahydroindenes, and hexahydroazulenes 8a-i, in which the NH-enaminone moiety is attached to the cyclopentadiene unit. The reaction involved formation of (3E)-1-metalla-1,3,5-hexatriene intermediates, which underwent pi cyclization faster than 3E/3Z isomerization. Tungsten complexes 12 and 13 were characterized as reaction intermediates. Compounds 8 are potentially bidentate ligands with respect to coordination both of the cyclopentadienyl and the enaminone moieties.
NH-烯胺酮2与[2-(1-环烯基)乙炔基]卡宾配合物7（M = W、Cr）反应生成四氢并五苯、四氢茚和六氢薁8a-i，其中NH-烯胺酮部分连接到环戊二烯单元上。该反应涉及(3E)-1-金属-1,3,5-己三烯中间体的形成，其进行π环化的速度比3E/3Z异构化快。钨配合物12和13被表征为反应中间体。就环戊二烯基和烯胺酮部分的配位而言，化合物8可能是双齿配体。
