Efficient and selective catalysis for hydrogenation and hydrosilation of alkenes and alkynes with PNP complexes of scandium and yttrium.

Efficient and selective catalysis for hydrogenation and hydrosilation of alkenes and alkynes with PNP complexes of scandium and yttrium.
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DOI:
10.1039/c7cc06417a
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发表时间:
2017-10-31
期刊:
Chemical communications (Cambridge, England)
影响因子:
--
通讯作者:
Andersen RA
Andersen RA
中科院分区:
其他
文献类型:
--
作者:
Levine DS;Tilley TD;Andersen RA

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研究了单阴离子PNP配体负载的钪、钇类配合物作为烯烃氢化和硅氢化反应、炔半氢化和半硅氢化反应的催化剂。发现钇同系物在所有情况下都更有活性,但这种更大的活性伴随着更快的催化剂分解,因此对于使用钪催化剂的一些反应来说,总收率更高。计算结果表明,反应可能通过烷基络合物的σ-键复分解生成金属氢化物中间体,并插入烯烃/炔。
Scandium and yttrium congeneric complexes, supported by a monoanionic PNP ligand, were studied as catalysts for alkene hydrogenation and hydrosilation, and alkyne semihydrogenation and semihydrosilation. The yttrium congener was found to be much more active in all cases, but this greater activity is accompanied by more rapid catalyst decomposition, and therefore higher total yields for some of the reactions with the scandium catalyst. Calculations indicate that the reactions may proceed via σ-bond metathesis of the alkyl complexes to form a metal hydride intermediates into which alkenes/alkynes insert.
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