Some organic syntheses with clay-supported reagents

Abstract

Some uses of clay-supported reagents in fine organic synthesis are discussed, in particular the catalysis of the phase-transfer preparation of formaldehyde acetals by quaternary ammonium montmorillonites. The preparation and some applications of clay-supported ferric nitrate, a new reagent which oxidizes alcohols into carbonyl derivatives, couples thiols into disulphides, nitrates phenols, and oxidatively couples pyrrole and benzaldehyde into tetra-phenylporphyrin, are also described

Can clay emit light? Ru(bpy)32+-modified clay colloids and their application in the detection of glucose

“…Since the work pioneered by Van Damme and coworkers [1,2] and Bard and coworkers [3,4], clays and their modified electrodes (CME) have stimulated a vast body of research on their electrochemistry [5][6][7] and photoelectrochemistry [1,[8][9][10] and applications in chemical and biochemical analyses [11][12][13][14][15]. Recently we reported several photocatalytic systems based on the iron-containing clay colloids (montmorillonite K10) and photosensitizers, like 10-methylacridinium and cyanoanthracenes.…”

Glucose sensing based on an effective conversion of O2 and H2O2 into superoxide anion radical with clay minerals

“…According to literature reports, most naturally occurring clay minerals contain a variety of metal ions, such as Fe II and Fe III , in their layer-structured frameworks due to the isomorphous substitution reactions with low valence transition-metal cations [54]. The contained iron species are effective mediators for a variety of reactions, such as the oxidation of aromatic compounds [55], the reduction of H 2 O 2 [56], the oxidation of ascorbic acid [57], and the photo-induced electron transfer across the clay|electro-lyte interface [58]. In view of this, we attribute the catalytic effect displayed by Mont.…”

Reactions of sulfenyl chlorides and their derivatives. 25. Reaction of chloride ion with thiiranium ions prepared by two different methods

“…A smaller range in E values is observed in the group of carbinols described by structure 3 than in the acyclic series. As mentioned above, the steric effects of substituents at C-2 in this group were assumed to be essentially constant.…”

“…The first reaction (eq 1) is the addition of methane-(la) or 4-chlorobenzenesulfenyl chloride (lb) to methylpropene, a reaction that is known to involve a thiiranium ion intermediate. 3 The second reaction (eq 2) is the preparation of a thiiranium ion by the addition of acid to methyl-3-(methylthio)propene (2a) or methyl-3-[(4-chlorophenyl)thiojpropene (2b). The rate-determining step in this reaction is the transfer of a proton to the alkene to form a d-arylthio carbocation,13 which immediately closes to form a thiiranium ion.…”