Tetraethylammonium chlorochromate

The kinetics and mechanism of oxidation of benzyl alcohol by tetraethylammonium chlorochromate have been studied.8... 

The oxidation of substituted /3-benzoylpropionic acids by PFC follows the Hammett relation with a negative reaction constant. A possible mechanism for the oxidation has been discussed.5 The oxidation of maleic, fumaric, crotonic, and cinnamic acids by PCC is of first order with respect to PCC and the acid. The oxidation rate in 19 organic solvents has been analysed by Kamlet s and Swain s multiparametric equations. A mechanism involving a three-centre transition state has been postulated.6 The relative reactivity of bishomoallylic tertiary alcohols toward PCC, to yield substituted THF products via the tethered chromate ester, is dependent only on the number of alkyl groups. This observation suggests a symmetrical transition state in this intramolecular Cr(VI)-alkene reaction.7 Mechanisms have been proposed for the oxidation of 2-nitrobenzaldehyde with PBC8 and of crotonaldehyde with tetraethylammonium chlorochromate.9... 

BTPPD), isoquinolinium bromochromate (IQBC), morpholinium chlorochromate (MCC), nicotinium dichromate (NDC), pyrazinium chlorochromate (PzCC), pyri-dinium bromochromate (PBC), pyridinium chlorochromate (PCC), pyridinium fluoro-chromate (PFC), quinolinium chlorochromate (QCC), quinolinium dichromate (QDC), quinolinium fluorochromate (QFC), tetraethylammonium chlorochromate (TEACC), tetramethylammonium fluorochromate (TMAFC), and some metal salts have been reported and these are described below. 

Kinetics of the oxidation of crotonaldehyde by tetraethylammonium chlorochromate have been measured in 50/50 aqueous acetic acid, including derivation of activation parameters. ... 

A relatively large number of oxidation studies have featured 3-benzyl-5-(2-hydroxyethyl)-4-methyl-l,3-thiazolium chlorochromate (BCC), benzyltriethy-lammonium chlorochromate (BTEACC), imido zolium chlorochromate (ICC), 1-methylimidazolium chlorochromate (MCC), morpholinium chlorochromate (MPCC), piperidinium chlorchromate (PPCC), pyridinium chlorochromate (PCC), quinald inium chlorochromate (QnCC), quinolinium chlorochromate (QLCC), tetraethylammonium chlorochromate (TEACC), and tetrakis(pyridine) cobalt(II) chromate (TPCC). 

Suitable mechanisms have been proposed following determination of the kinetic and activation parameters for oxidation of 2-naphthol and cyclic ketones by nicotinium dichromate some a-amino acids by tripropylammonium fluorochromate " distyryl ketone by quinaldinium fluorochromate methanol by benzyltriethylammonium chlorochromate catalysed by 1,10-phenanthroline substituted benzyl alcohols by tetraethylammonium bromochromate L-cysteine by pyridinium bromochromate lactic acid and 3,5-dimethyl-2,6-diaryl piperidin-4-one oximes by pyridinium chlorochromate allyl alcohol by IDC benzophenoxime by bispyridine silver(I) dichromate and alkyl phenyl sulfides by cetyltrimethylammonium dichromate. A non-linear Hammett plot obtained for the oxidation of substituted benzyl alcohols by IDC has been attributed to the operation of substituent effect on two steps of the proposed mechanism. " Kinetic and activation parameters for oxidation of o-toluidine and of A-methyl-2,6-diphenyl piperidin-4-one oxime and its 3-alkyl derivatives by sodium dichromate have been determined and suitable mechanisms have been suggested. Micellar catalysis in the 1,10-phenanthroline-promoted chromic acid oxidation of propanol... 

---