2022
DOI: 10.1002/ejic.202200536
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Influence of Coordination Geometry on the Ring Opening of Benzoxazine: Oxidovanadium(V), Dioxidomolybdenum(VI) and Dioxidotungsten(VI) Complexes of Benzoxazine Based Ligands and their Bio Inspired Catalytic Applications

Abstract: Mono benzoxazine appended N‐capped amino bis(disubstitutedphenol) ligands [II(a–c)] upon reaction with VVO(OEt)3 in a 1 : 1 molar ratio in EtOH/MeOH give [{VVO}en(3,5‐dtbb)3] (1), [{VVO}en(3‐tb,5‐mb)3] (2) and [{VVO}en(3,5‐dmb)3] (3). During the reaction, the benzoxazine ring opens with the loss of methylene group and the newly formed ligands, N,N‐bis(2‐hydroxy‐3,5‐disubstitutedbenzyl)‐N’‐2‐hydroxy‐3,5‐disubstituted benzyledene‐1,2‐diaminoethane [III(a–c)], behave as tribasic pentadentate in these complexes. U… Show more

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Cited by 5 publications
(2 citation statements)
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“…This strategy has been demonstrated with numerous molybdenum complexes bearing a variety of ligands. [60][61][62][63][64][65][66][67][68][69][70] However, despite the structural diversity of the molybdenum complexes, reactivity is presumed to always follow the general mechanism of formation of a metal oxoperoxo species followed by attack of the metal peroxo by bromide to yield hypobromite. Reactions of this type do not easily fit the typical description of OAT from a metal dioxo as the metal oxygen double bond is not acting as the oxygen atom donor.…”
Section: Perspectivementioning
confidence: 99%
“…This strategy has been demonstrated with numerous molybdenum complexes bearing a variety of ligands. [60][61][62][63][64][65][66][67][68][69][70] However, despite the structural diversity of the molybdenum complexes, reactivity is presumed to always follow the general mechanism of formation of a metal oxoperoxo species followed by attack of the metal peroxo by bromide to yield hypobromite. Reactions of this type do not easily fit the typical description of OAT from a metal dioxo as the metal oxygen double bond is not acting as the oxygen atom donor.…”
Section: Perspectivementioning
confidence: 99%
“…These catalysts can promote the cleavage of the CH 2 -O bond on the oxazine ring, shorten the curing temperature, and reduce the curing reaction time. According to the literature, phenols, alcohols, mercaptans, carboxylic acids, Lewis acids, various metal complexes, and iodized salts have been successfully used to lower the ROP temperature [ 34 , 35 ]. Zhao et al used pyrogallol as a catalyst for the ROP of BZ, reducing the exothermic peak temperature of BZ from 256 °C to 174 °C [ 27 ].…”
Section: Introductionmentioning
confidence: 99%