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Diazomethane umpolung atop anthracene: an electrophilic methylene transfer reagent†
Chemical Science ( IF 7.6 ) Pub Date : 2017-12-21 00:00:00 , DOI: 10.1039/c7sc04506a Maximilian Joost 1 , Wesley J Transue 1 , Christopher C Cummins 1
Chemical Science ( IF 7.6 ) Pub Date : 2017-12-21 00:00:00 , DOI: 10.1039/c7sc04506a Maximilian Joost 1 , Wesley J Transue 1 , Christopher C Cummins 1
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Formal addition of diazomethane's terminal nitrogen atom to the 9,10-positions of anthracene yields H2CN2A (1, A = C14H10 or anthracene). The synthesis of this hydrazone is reported from Carpino's hydrazine H2N2A through treatment with paraformaldehyde. Compound 1 has been found to be an easy-to-handle solid that does not exhibit dangerous heat or shock sensitivity. Effective umpolung of the diazomethane unit imbues 1 with electrophilicity at the methylene carbon center. Its reactivity with nucleophiles such as H2CPPh3 and N-heterocyclic carbenes is exploited for C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
C bond formation with elimination of dinitrogen and anthracene. Similarly, 1 is demonstrated to deliver methylene to a nucleophilic singlet d2 transition metal center, W(ODipp)4 (2), to generate the robust methylidene complex [2CH2]. This behavior is contrasted with that of the Wittig reagent H2CPPh3, a more traditional and Brønsted basic methylene source that upon exposure to 2 contrastingly forms the methylidyne salt [MePPh3][2![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
CH].
中文翻译：
蒽上的重氮甲烷 umpolung：亲电亚甲基转移试剂†
将重氮甲烷的末端氮原子正式加成到蒽的 9,10 位会产生 H 2 CN 2 A（1，A = C 14 H 10或蒽）。该腙的合成是由 Carpino 的肼 H 2 N 2 A通过多聚甲醛处理合成的。已发现化合物1是一种易于处理的固体，不会表现出危险的热或冲击敏感性。重氮甲烷单元的有效 umpolung在亚甲基碳中心赋予1亲电性。它与亲核试剂如 H 2 CPPh的反应性3和N-杂环卡宾被开发用于CC键的形成，同时消除了二氮和蒽。类似地， 1被证明可以将亚甲基传递到亲核单线态 d 2过渡金属中心 W(ODipp) 4 ( 2 )，从而产生稳定的亚甲基配合物 [ 2 CH 2 ]。这种行为与 Wittig 试剂 H 2 CPPh 3的行为形成对比，后者是一种更传统的布朗斯台德碱性亚甲基源，在暴露于2时形成亚甲基盐 [MePPh 3 ][ 2 CH]。
更新日期：2017-12-21
C bond formation with elimination of dinitrogen and anthracene. Similarly, 1 is demonstrated to deliver methylene to a nucleophilic singlet d2 transition metal center, W(ODipp)4 (2), to generate the robust methylidene complex [2CH2]. This behavior is contrasted with that of the Wittig reagent H2CPPh3, a more traditional and Brønsted basic methylene source that upon exposure to 2 contrastingly forms the methylidyne salt [MePPh3][2CH].
中文翻译：
蒽上的重氮甲烷 umpolung：亲电亚甲基转移试剂†
将重氮甲烷的末端氮原子正式加成到蒽的 9,10 位会产生 H 2 CN 2 A（1，A = C 14 H 10或蒽）。该腙的合成是由 Carpino 的肼 H 2 N 2 A通过多聚甲醛处理合成的。已发现化合物1是一种易于处理的固体，不会表现出危险的热或冲击敏感性。重氮甲烷单元的有效 umpolung在亚甲基碳中心赋予1亲电性。它与亲核试剂如 H 2 CPPh的反应性3和N-杂环卡宾被开发用于C
C键的形成，同时消除了二氮和蒽。类似地， 1被证明可以将亚甲基传递到亲核单线态 d 2过渡金属中心 W(ODipp) 4 ( 2 )，从而产生稳定的亚甲基配合物 [ 2 CH 2 ]。这种行为与 Wittig 试剂 H 2 CPPh 3的行为形成对比，后者是一种更传统的布朗斯台德碱性亚甲基源，在暴露于2时形成亚甲基盐 [MePPh 3 ][ 2 CH]。
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