Chemistry of selena macrocycles

Panda, Arunashree

doi:10.1016/j.ccr.2008.07.006

Cited by 62 publications

(28 citation statements)

References 59 publications

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“…The E ½ value in 1 is À13 (62) mV, which is more negative than that of 1,2,3-triselena [3]ferrocenophane (E ½ = 213 mV) [16]. The observation shows that ferrocene unit in 1 becomes easier to oxidize, meaning the decrease of the ring strain and the interaction between the middle selenium atom in the bridge and (1) 8NaBH 4 (2 [5]ferrocenophane (E ½ = 2 (115) mV) [6], the larger ring size of 1 leads to a little more negative shift. The E ½ value of 2 is 46 (117) mV, which is more positive than that of 1 and 1,5-diselena [5]ferrocenophane.…”

Section: Introductionmentioning

confidence: 87%

“…As softer donor ligands, selenoether macrocyclic ligands are expected to have a rich chemistry, especially with the post-transition metals [4,5]. In this context, the design and study of polyselenaferrocenophanes is an exciting challenge because of their unique chemical properties resulting from the functionality of the side arm and the possibility working as highly sensitive electrochemical sensors for the soft metal cations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Two novel macrocyclic polyselenaferrocenophanes: Synthesis, crystal structures and electrochemical study

Jing

et al. 2009

Inorganic Chemistry Communications

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Section: Introductionmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Two novel macrocyclic polyselenaferrocenophanes: Synthesis, crystal structures and electrochemical study

Jing

et al. 2009

Inorganic Chemistry Communications

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“…The most important types of synthetic organoselenium compounds are diorganodiselenides (R-Se-Se-R) [175,176], selenols (R-Se-H) [177], diorganoselenides (R-Se-R ) [178,179], diorganoselenoxides (R 2 Se = O) [180][181][182], selenenyl sulfides (R-Se-S-R ) [183], organoselenium halides (R-Se-X, R 2 SeX 2 and R 3 SeX) [184], selenenic and selenonic acids (R-Se-OH, R-Se(O)-OH, R-Se(O) 2 )-OH) [185], and selenic and selenious acid aliphatic and aromatic and cyclic esters (alkyl and aryl selenates and selenites). In the last 20 years a great effort has been directed toward the synthesis of biologically active organoselenium compounds as potential antitumor agents [20,21,25,[186][187][188][189][190][191], enzyme modulators [192], antioxidants [193][194][195], antimicrobials [196][197][198][199][200][201][202], antivirals [203][204][205][206][207][208][209], and cytokine inducers [210].…”

Section: Organoselenium Natural and Synthetic Compoundsmentioning

confidence: 99%

Selenium-Containing Polysaccharides—Structural Diversity, Biosynthesis, Chemical Modifications and Biological Activity

2021

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Selenosugars are a group of sugar derivatives of great structural diversity (e.g., molar masses, selenium oxidation state, and selenium binding), obtained as a result of biosynthesis, chemical modification of natural compounds, or chemical synthesis. Seleno-monosaccharides and disaccharides are known to be non-toxic products of the natural metabolism of selenium compounds in mammals. In the case of the selenium-containing polysaccharides of natural origin, their formation is also postulated as a form of detoxification of excess selenium in microorganisms, mushroom, and plants. The valency of selenium in selenium-containing polysaccharides can be: 0 (encapsulated nano-selenium), IV (selenites of polysaccharides), or II (selenoglycosides or selenium built into the sugar ring to replace oxygen). The great interest in Se-polysaccharides results from the expected synergy between selenium and polysaccharides. Several plant- and mushroom-derived polysaccharides are potent macromolecules with antitumor, immunomodulatory, antioxidant, and other biological properties. Selenium, a trace element of fundamental importance to human health, has been shown to possess several analogous functions. The mechanism by which selenium exerts anticancer and immunomodulatory activity differs from that of polysaccharide fractions, but a similar pharmacological effect suggests a possible synergy of these two agents. Various functions of Se-polysaccharides have been explored, including antitumor, immune-enhancement, antioxidant, antidiabetic, anti-inflammatory, hepatoprotective, and neuroprotective activities. Due to being non-toxic or much less toxic than inorganic selenium compounds, Se-polysaccharides are potential dietary supplements that could be used, e.g., in chemoprevention.

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“…The first ever novel selenium and tellurium-containing macrocyclic Schiff base ligands (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13) were synthesized in high yield via one-step dipodal condensation of bis(o-formylphenyl) chalcogenides (1-2) and the corresponding diamines without recourse to the metal ion template or high dilution reaction (Scheme 1) [16][17][18][19][20][21]. The reaction is carried out in CH 3 CN at ambient temperature for 24 h to give the [2+2]-macrocyclic azomethines in 32-91% yield.…”

Section: Macrocyclesmentioning

confidence: 99%

“…Though this topic has been included briefly in the recent comprehensive reviews on selenium and tellurium containing macrocycles [11,12], the main intention of this microreview is to discuss the salient findings of our group and draw attention of the researchers to this novel and promising class of compounds for which the detailed chemistry and applications are yet to be explored. Relevant works of others in the same field are also included.…”

Section: Introductionmentioning

confidence: 99%