{"title":"Electrophilic As-functionalisation of σ-arsolido complexes†","authors":"Ryan M. Kirk and Anthony F. Hill","doi":"10.1039/D4DT01371A","DOIUrl":null,"url":null,"abstract":"<p >The σ-arsolido complex [Mo(AsC<small><sub>4</sub></small>Me<small><sub>4</sub></small>)(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)] is alkylated at arsenic by MeOTf to afford the pentamethylarsole complex [Mo(MeAsC<small><sub>4</sub></small>Me<small><sub>4</sub></small>)(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)](OTf) while iodomethane affords a mixture of [Me<small><sub>2</sub></small>AsC<small><sub>4</sub></small>Me<small><sub>4</sub></small>]I, [MoMe(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)], [MoI(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)] and the arsole complexes <em>cisoid</em>- and <em>transoid</em>-[MoI(MeAsC<small><sub>4</sub></small>Me<small><sub>4</sub></small>)(CO)<small><sub>2</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)] and <em>transoid</em>-[Mo{C(<img>O)Me}(MeAsC<small><sub>4</sub></small>Me<small><sub>4</sub></small>)(CO)<small><sub>2</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)], The arsole ligand in [Mo(MeAsC<small><sub>4</sub></small>Me<small><sub>4</sub></small>)(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)](OTf) is readily liberated by NaI in acetone to afford free MeAsC<small><sub>4</sub></small>Me<small><sub>4</sub></small> and [MoI(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)]. In a similar manner, the reaction of [Mo(AsC<small><sub>4</sub></small>Ph<small><sub>4</sub></small>)(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)] with MeI affords MeAsC<small><sub>4</sub></small>Ph<small><sub>4</sub></small> and [MoI(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)], while [Mo{AsC<small><sub>4</sub></small>(SiMe<small><sub>3</sub></small>)-2-Me<small><sub>2</sub></small>-3,4}(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)] with MeOTf affords [Mo{MeAsC<small><sub>4</sub></small>(SiMe<small><sub>3</sub></small>)-2-Me<small><sub>2</sub></small>-3,4}(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)](OTf). The reaction of [Mo(AsC<small><sub>4</sub></small>Me<small><sub>4</sub></small>)(CO)<small><sub>3</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)] with activated alkynes (RC<img>CR: R = CF<small><sub>3</sub></small>, CO<small><sub>2</sub></small>Me) does not proceed <em>via</em> [4 + 2] <em>cyclo</em>-addition but rather electrophilic attack at arsenic followed by metallacyclisation with incorporation of a carbonyl ligand in the spirocyclic complexes [Mo{As(C<small><sub>4</sub></small>Me<small><sub>4</sub></small>)CR<img>CRCO}(CO)<small><sub>2</sub></small>(η<small><sup>5</sup></small>-C<small><sub>5</sub></small>H<small><sub>5</sub></small>)].</p>","PeriodicalId":71,"journal":{"name":"Dalton Transactions","volume":null,"pages":null},"PeriodicalIF":3.5000,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Dalton Transactions","FirstCategoryId":"92","ListUrlMain":"https://pubs.rsc.org/en/content/articlelanding/2024/dt/d4dt01371a","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
The σ-arsolido complex [Mo(AsC4Me4)(CO)3(η5-C5H5)] is alkylated at arsenic by MeOTf to afford the pentamethylarsole complex [Mo(MeAsC4Me4)(CO)3(η5-C5H5)](OTf) while iodomethane affords a mixture of [Me2AsC4Me4]I, [MoMe(CO)3(η5-C5H5)], [MoI(CO)3(η5-C5H5)] and the arsole complexes cisoid- and transoid-[MoI(MeAsC4Me4)(CO)2(η5-C5H5)] and transoid-[Mo{C(O)Me}(MeAsC4Me4)(CO)2(η5-C5H5)], The arsole ligand in [Mo(MeAsC4Me4)(CO)3(η5-C5H5)](OTf) is readily liberated by NaI in acetone to afford free MeAsC4Me4 and [MoI(CO)3(η5-C5H5)]. In a similar manner, the reaction of [Mo(AsC4Ph4)(CO)3(η5-C5H5)] with MeI affords MeAsC4Ph4 and [MoI(CO)3(η5-C5H5)], while [Mo{AsC4(SiMe3)-2-Me2-3,4}(CO)3(η5-C5H5)] with MeOTf affords [Mo{MeAsC4(SiMe3)-2-Me2-3,4}(CO)3(η5-C5H5)](OTf). The reaction of [Mo(AsC4Me4)(CO)3(η5-C5H5)] with activated alkynes (RCCR: R = CF3, CO2Me) does not proceed via [4 + 2] cyclo-addition but rather electrophilic attack at arsenic followed by metallacyclisation with incorporation of a carbonyl ligand in the spirocyclic complexes [Mo{As(C4Me4)CRCRCO}(CO)2(η5-C5H5)].
期刊介绍:
Dalton Transactions is a journal for all areas of inorganic chemistry, which encompasses the organometallic, bioinorganic and materials chemistry of the elements, with applications including synthesis, catalysis, energy conversion/storage, electrical devices and medicine. Dalton Transactions welcomes high-quality, original submissions in all of these areas and more, where the advancement of knowledge in inorganic chemistry is significant.