01418nas a2200169   4500008004100000022001400041245016500055210006900220260011000289300001600399490000700415520064400422100001601066700002301082700001601105856012701121       2015                        eng d  a1477-052000aTitanium superoxide - a stable recyclable heterogeneous catalyst for oxidative esterification of aldehydes with alkylarenes or alcohols using TBHP as an oxidant0 aTitanium superoxide a stable recyclable heterogeneous catalyst f  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcSEP  a10631-106400 v133 a<p>Titanium superoxide efficiently catalysed the oxidative esterification of aldehydes with alkylarenes or alcohols, under truly heterogeneous conditions, to afford the corresponding benzyl and alkyl esters in excellent yields. Mechanistic studies have established that this ``one pot'' direct oxidative esterification process proceeds through a radical pathway, proven by a FTIR spectral study of a titanium superoxide-aldehyde complex as well as spin trapping experiments with TEMPO. The intramolecular version of this protocol has been successfully demonstrated in the concise synthesis of 3-butylphthalide, an anti-convulsant drug.</p>1 aDey, Soumen1 aGadakh, Sunita, K.1 aSudalai, A.  uhttps://library.ncl.res.in/content/titanium-superoxide-stable-recyclable-heterogeneous-catalyst-oxidative-esterification-0