Intramolecular donor-stabilized tetra-coordinated germanium(<scp>iv</scp>) di-cations and their Lewis acidic properties

Peddi, Balakrishna; Khan, Souvik; Gonnade, Rajesh G.; Yildiz, Cem B.; Majumdar, Moumita

doi:10.1039/d3sc03717g

Cited by 4 publications

(2 citation statements)

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“…Thus, compounds 1–3 are weak Lewis acids compared to other reported germanium( iv ) based Lewis acids and superacids. 28,29,32,33 This may be due to the coordination of the basic nitrogen atom of the azomethine group of the ligand to Ge( iv ), which reduces its Lewis acidity. However, compound 1 is a stronger Lewis acid among compounds 1–3 , because of the presence of aromatic phenyl groups attached to the Ge( iv ) centre and the nitro group of the ligand.…”

Section: Resultsmentioning

confidence: 99%

“…31 Very recently, Inoue reported a Ge( iv )-centred Lewis super acid, bis(perfluoropinacolato)germane 32 and the Majumdar group reported tetra-coordinated germanium( iv ) di-cations. 33 Both classes of compounds successfully activated the hydrosilanes. With this background of Ge( iv ) compounds as catalysts, we decided to explore Ge( iv ) catalysts in the synthesis of 5-substituted 1 H -tetrazoles, which has not been investigated using any Ge( iv ) catalyst so far.…”

Section: Introductionmentioning

confidence: 99%

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Mononuclear organogermanium(iv) catalysts for a [3 + 2] cycloaddition reaction

Basu,

Ghosh,

Srivastava

et al. 2024

Dalton Trans.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mononuclear organogermanium(iv) catalysts for a [3 + 2] cycloaddition reaction

Basu,

Ghosh,

Srivastava

et al. 2024

Dalton Trans.

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Organotin(IV) Compounds as Catalysts for the Solvent-Free Synthesis of Naphthofurans

Kumar,

Nayek

2024

Organometallics

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Four distinct organotin(IV) compounds, [R 2 Sn-(L 1 )] [R = Ph (1) and n-Bu (2)] and [R 2 Sn(L 2 )] [R = Ph (3) and n-Bu (4)], have been synthesized from two polydentate proligands such as 2-((2-hydroxy-3-methoxybenzylidene)amino)-4-methyl phenol (H 2 L 1 ) and 4-(tert-butyl)-2-(((2-hydroxy-5-methylphenyl)imino)methyl)phenol (H 2 L 2 ). The organotin(IV) compounds were synthesized by the reaction of organotin(IV) halides such as Ph 2 SnCl 2 and (n-Bu) 2 SnCl 2 with both proligands using Et 3 N as a base. All compounds were fully characterized using FT-IR spectroscopy; 1 H, 13 C{ 1 H}, and 119 Sn NMR spectroscopy; HRMS spectrometry; and single-crystal X-ray diffraction analysis. The Lewis acidity of all compounds was determined by the Gutmann− Beckett method. The catalytic activities of all of the compounds were investigated for the synthesis of naphthofurans from trans-β-nitrostyrene derivatives and β-naphthol or α-naphthol under solvent-free conditions. The maximum yield of naphthofurans is up to 95%.

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Diverse Functionality of Molecular Germanium: Emerging Opportunities as Catalysts

Mukherjee,

Majumdar

2024

J. Am. Chem. Soc.

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Fundamental research on germanium as the central element in compounds for bond activation chemistry and catalysis has achieved significant feats over the last two decades. Designing strategies for small molecule activations and the ultimate catalysts established capitalize on the orbital modalities of germanium, apparently imitating the transition-metal frontier orbitals. There is a growing body of examples in contemporary research implicating the tunability of the frontier orbitals through avant-garde approaches such as geometric constrained empowered reactivity, bimetallic orbital complementarity, cooperative reactivity, etc. The goal of this Perspective is to provide readers with an overview of the emerging opportunities in the field of germanium-based catalysis by perceiving the underlying key principles. This will help to convert the discrete set of findings into a more systematic vision for catalyst designs. Critical exposition on the germanium's frontier orbitals participations evokes the key challenges involved in innovative catalyst designs, wherein viewpoints are provided. We close by addressing the forward-looking directions for germanium-based catalytic manifold development. We hope that this Perspective will be motivational for applied research on germanium as a constituent of pragmatic catalysts.

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Intramolecular donor-stabilized tetra-coordinated germanium(iv) di-cations and their Lewis acidic properties

Cited by 4 publications

References 91 publications

Mononuclear organogermanium(iv) catalysts for a [3 + 2] cycloaddition reaction

Mononuclear organogermanium(iv) catalysts for a [3 + 2] cycloaddition reaction

Organotin(IV) Compounds as Catalysts for the Solvent-Free Synthesis of Naphthofurans

Diverse Functionality of Molecular Germanium: Emerging Opportunities as Catalysts

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