铅烷和铅烯的杂环卡宾及环状（烷基）（氨基）卡宾加合物。

-heterocyclic carbene and cyclic (alkyl)(amino)carbene adducts of plumbanes and plumbylenes.

作者信息

Philipp Michael S M, Bertermann Rüdiger, Radius Udo

机构信息

Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.

出版信息

Dalton Trans. 2022 Sep 13;51(35):13488-13498. doi: 10.1039/d2dt02462d.

DOI:10.1039/d2dt02462d

PMID:35997066

Abstract

-acid/base adducts of -heterocyclic carbenes (NHCs) and the cyclic (alkyl)(amino)carbene cAAC (1-(2,6-di-iso-propylphenyl)-3,3,5,5-tetramethyl-pyrrolidin-2-ylidene) with selected lead(II) and lead(IV) compounds are presented. The reaction of the NHCs MeIm (1,3,4,5-tetramethyl-imidazolin-2-ylidene), iPrIm (1,3-di-isopropyl-4,5-dimethyl-imidazolin-2-ylidene), DippIm (1,3-bis-(2,6-di-isopropylphenyl)-imidazolin-2-ylidene) and cAAC (1-(2,6-di-iso-propylphenyl)-3,3,5,5-tetramethyl-pyrrolidin-2-ylidene) with PbI yielded the NHC-containing plumbylenes NHC·PbI (NHC = MeIm (1), iPrIm (2), DippIm (3) and cAAC·PbI (4)). Using the Pb(IV) compound PbClPh, the plumbane adducts NHC·PbClPh (NHC = MeIm (5), iPrIm (6), DippIm (7)) and cAAC·PbClPh (8)) were isolated in high yields. Reduction of the lead(IV) adducts 5 and 6 with excess KC afforded the diaryl substituted plumbylenes MeIm·PbPh (9) and iPrIm·PbPh (10), which are stable in the solid state but decompose in solution.

摘要

介绍了含氮杂环卡宾（NHCs）和环状（烷基）（氨基）卡宾cAAC（1-(2,6-二异丙基苯基)-3,3,5,5-四甲基-吡咯烷-2-亚基）与选定的铅（II）和铅（IV）化合物形成的酸碱加合物。NHCs MeIm（1,3,4,5-四甲基-咪唑啉-2-亚基）、iPrIm（1,3-二异丙基-4,5-二甲基-咪唑啉-2-亚基）、DippIm（1,3-双（2,6-二异丙基苯基）-咪唑啉-2-亚基）和cAAC（1-(2,6-二异丙基苯基)-3,3,5,5-四甲基-吡咯烷-2-亚基）与PbI反应生成了含NHC的铅烯NHC·PbI（NHC = MeIm（1）、iPrIm（2）、DippIm（3）和cAAC·PbI（4））。使用铅（IV）化合物PbClPh，以高产率分离得到了铅烷加合物NHC·PbClPh（NHC = MeIm（5）、iPrIm（6）、DippIm（7））和cAAC·PbClPh（8））。用过量的KC还原铅（IV）加合物5和6得到了二芳基取代的铅烯MeIm·PbPh（9）和iPrIm·PbPh（10），它们在固态下稳定，但在溶液中会分解。