REACTIONS OF DISUBSTITUTED ALKYNES WITH BROMOTRIS(TRIMETHYLPHOSPHINE)COBALT(I) - SYNTHESIS AND MOLECULAR AND CRYSTAL-STRUCTURES OF [CO(ETA-2-PHC=CC5H11)(PME3)3]BPH4 AND [CO(SIGMA-2-(CO2ME)4C4)(MECN)2(PME3)2]BPH4
REACTIONS OF DISUBSTITUTED ALKYNES WITH BROMOTRIS(TRIMETHYLPHOSPHINE)COBALT(I) - SYNTHESIS AND MOLECULAR AND CRYSTAL-STRUCTURES OF [CO(ETA-2-PHC=CC5H11)(PME3)3]BPH4 AND [CO(SIGMA-2-(CO2ME)4C4)(MECN)2(PME3)2]BPH4
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DOI：
10.1021/om00105a009
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发表时间：
1989-03-01
期刊：
影响因子：
2.8
通讯作者：
BEAUCHAMP, AL
中科院分区：
文献类型：
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作者：
BOUAYAD, A;DARTIGUENAVE, M;BEAUCHAMP, AL
(2)，Z= 8，R= 0.055，Rw= 0.061，对于3864次反射）证实了含有两个反式膦、两个顺式乙腈和平面钴环戊二烯环的八面体d6 Co（III）单体的存在。从这些结果可以看出，在具有两个空d轨道的阳离子d8金属配合物中：（i）烷基和芳基炔作为4e供体，（ii）吸电子取代基如乙炔二羧酸二甲酯或丙酸甲酯中的吸电子取代基是将炔偶联成钴环戊二烯配合物所必需的，和（iii）炔聚合不发生。
(2), Z= 8, R= 0.055, Rw= 0.061 for 3864 reflections) confirms the presence of an octahedral d6 Co (III) monomer containing two trans phosphines, two cis acetonitriles, and a planar cobaltacyclopentadiene ring. From these results, it appears that in cationic d8 metal complexes having two vacant d orbitals:(i) alkyl-and arylalkynes act as 4e donors,(ii) electron-withdrawing substituents as in dimethyl acetylenedicarboxylate or methyl propicíate are necessary to couple alkynes into cobaltacyclopentadiene complexes, and (iii) alkyne polymerization does not take place.