Reactivity of bridged pentelidene complexes with isonitriles: a new way to pentel-containing heterocycles.
Reactivity of bridged pentelidene complexes with isonitriles: a new way to pentel-containing heterocycles.
复制标题
桥联戊烯配合物与异腈的反应性:制备含戊烯杂环的新方法
作者:
M. Seidl;M. Schiffer;M. Bodensteiner;A. Y. Timoshkin;M. Scheer
The reaction of [Cp*E{W(CO)5}2] (E=P (1 a), As (1 b); Cp*=1,2,3,4,5‐pentamethylcyclopentadienyl) with isonitriles RNC (R=tBu, cyclohexyl (Cy),nBu) depends on the steric demand of the substituent at the isonitrile as well as on the stoichiometry of the starting materials. WithtBuNC only the Lewis acid/base adducts [Cp*E{W(CO)5}2(CNtBu)] (E=P (2 a), As (2 b)) are formed. The use of Cy andn‐butylisonitrile leads first to the formation of the Lewis acid/base adduct, but only at low temperatures. At ambient temperatures, a rearrangement occurs and bicyclo[3.2.0]heptane derivatives of the type [{C(Me)C(CH2)C(Me)C(Me)C(Me)}C(NR)‐ E{W(CO)5}2] (E=P, As; R=Cy,nBu) (3 a‐Cy,3 b‐Cy,3 a‐nBuand3 b‐nBu) are obtained. The use of a further equivalent of isonitrile results in products revealing two new structural motifs, the four‐membered ring derivatives [C(Cp*)N(R)C(NR)E{W(CO)5}2] (4: E=P, As; R=Cy,nBu) and the bicyclic complexes [[{C(Me)C‐ (CH2)C(Me)C(Me)C(Me)}C(NR)2‐ E{W(CO)5}2] (5: E=As; R=Cy). The reaction pathway depends on the substituent at the isonitrile. By treatment of1 awith two equivalents of CyNC only a 2H‐1,3‐azaphosphet complex4 a‐Cy(E=P; R=Cy) is formed. Treatment of1 bwith two equivalents of CyNC exclusively leads to the complex5 b‐Cy(E=As; R=Cy). Treatment of1 awith two equivalents ofnBuNC results in a mixture of complexes, the 2H‐1,3‐azaphosphet4 a‐nBu(E=P; R=nBu) and the bicyclic complex5 a‐nBu(E=P; R=nBu). For the arsenidene complex1 ba mixture of the 2H‐1,3‐azarsete complex4 b‐nBu(E=As; R=nBu) and the bicyclic complex5 b‐nBu(E=P, As; R=Cy,nBu) is obtained. Complex4 b‐nBuis the first example of a 2H‐1,3‐azarsete complex. All products have been characterized by using mass spectrometry, NMR spectroscopy, and X‐ray diffraction analysis.
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DOI:
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发表时间:
2006
期刊:
影响因子:
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DOI:
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发表时间:
1986
期刊:
影响因子:
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DOI:
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发表时间:
2001
期刊:
影响因子:
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