the presence of manganese(III) acetate gives naphthalenecarbaldehydes and naphthalenecarboxylic acids. Similar reactions of anthracene, pyrene, and methoxybenzenes also yield formylated and carboxylated products. It was found that the formyl group introduced to the aromatic ring was not derived from carboxymethyl radical generated directly by the thermolysis of manganese(III) acetate, but from a dicarboxymethyl
Cobalt(II)-catalyzed reaction between polycyclic aromatic aldehydes and acetic anhydride. Formation of acylals, not 1,2-diketones
作者:Albert J. Fry、Aloysius K. Rho、Laura R. Sherman、Carol S. Sherwin
DOI:10.1021/jo00010a021
日期:1991.5
Several polycyclic aromatic aldehydes were found to react with acetic anhydride in acetonitrile in the presence of excess CoCl2 to afford the corresponding acylals [ArCH(OAc)2]. The results are not consistent with the literature report (Ahmad, S.; Iqbal, J. J. Chem. Soc., Chem. Commun. 1987, 692) that substituted benzaldehydes afford 1,2-diketones under similar conditions. The cobalt(II) chloride probably promotes acylal formation through its weakly Lewis acid character.
NISHINO, HIROSHI;TSUNODA, KATSUNORI;KUROSAWA, KAZU, BULL. CHEM. SOC. JAP., 62,(1989) N, C. 545-550
FRY, ALBERT J.;RHO, ALOYSIUS K.;SHERMAN, LAURA R.;SHERWIN, CAROL S., J. ORG. CHEM., 56,(1991) N0, C. 3283-3286
作者:FRY, ALBERT J.、RHO, ALOYSIUS K.、SHERMAN, LAURA R.、SHERWIN, CAROL S.
DOI:——
日期:——
Tungstosulfonic acid as an efficient solid acid catalyst for acylal synthesis for the protection of the aldehydic carbonyl group
作者:Reddi Mohan Naidu Kalla、Mi Ri Kim、Yu Na Kim、Il Kim
DOI:10.1039/c5nj02697k
日期:——
Tungstosulfonic acid (TSA) has been found to be an efficient solid acid catalyst for the protection of aldehydic carbonyl groups by geminal diacetate (acylal) formation following the nucleophilic addition of acetic anhydride under neat conditions as well as in a solvent. The TSA catalyst is fully characterized by infrared spectroscopy, wide-angle X-ray scattering analysis, and scanning electron microscopy