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- W4296802023 abstract "Abstract The new diaminoacetylene (DAA) dimorpholinoacetylene ( 3 ) was prepared from 1,1‐dimorpholinoethene ( 1 ) by bromination to form the dibromoketene aminal 2 , which upon lithiation afforded 3 through a Fritsch‐Buttenberg‐Wiechell rearrangement. Heating 3 at elevated temperatures resulted in a complete conversion into the dimer 1,1,2,4‐tetramorpholino‐1‐buten‐3‐yne ( 4 ), which was used for the synthesis of four‐membered cyclic bent allene (CBA) transition‐metal complexes of the type [(CBA)ML n ] ( 5 ‐ 7 ; ML n =AuCl, RhCl(COD), RhCl(CO) 2 ; CBA=1,3,4,4‐tetramorpholino‐1,2‐cyclobutadiene; COD=1,5‐cyclooctadiene). The reaction of 3 with tetraethylammonium bromide gave 1,2,3,4‐tetramorpholinocyclobutenylium bromide ( 8 ), which reacted with bromine to form 1,2,3,4‐tetra(morpholino)cyclobutenediylium bis(tribromide) ( 9 ). Compound 9 represents the first fully characterized compound containing a tetraaminocyclobutadiene dication and displays a nearly planar C 4 N 4 core as shown by X‐ray diffraction analysis. Detailed quantum chemical calculations were performed to assess the aromaticity of tetraaminocyclubutadiene dications by employing the Nucleus Independent Chemical Shift (NICS) method and current density analysis." @default.
- W4296802023 created "2022-09-24" @default.
- W4296802023 creator A5029808971 @default.
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- W4296802023 creator A5048817919 @default.
- W4296802023 creator A5056072100 @default.
- W4296802023 creator A5060956429 @default.
- W4296802023 date "2022-11-03" @default.
- W4296802023 modified "2023-09-30" @default.
- W4296802023 title "Dimorpholinoacetylene and Its Use for the Synthesis of Tetraaminocyclobutadiene Species" @default.
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- W4296802023 doi "https://doi.org/10.1002/chem.202202737" @default.
- W4296802023 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36148808" @default.
- W4296802023 hasPublicationYear "2022" @default.
- W4296802023 type Work @default.