78310-16-4Relevant academic research and scientific papers
Surface-Mediated Reactions. 6. Effects of Silica Gel and Alumina on Acid-Catalyzed Reactions
Kropp, Paul J.,Breton, Gary W.,Craig, Stephen L.,Crawford, Scott D.,Durland, William F.,et al.
, p. 4146 - 4152 (1995)
Absorption of a variety of acids to chromatographic silica gel results in substantial enhancement of their catalytic activity-affording easily prepared, environmentally benign heterogeneous acids that are highly effective in mediating a number of processes.This was shown for the isomerization of allene 1 and dimerization of the corresponding 1,3-diene 2; cyclization of (R)-citronellal (5), the related diester 10, and 1,5-cyclooctadiene (15); Rupe rearrangement of alkynol 18; and Friedel-Crafts cyclodehydration of alcohols 21.By contrast, commercially available Nafion-H was significantly less effective as a heterogeneous acid catalyst.Chromatographic alumina displayed enigmatic behavior, showing enhanced acidity on the adsorption of HCl but little or no acidity on the adsorption of a variety of other types of acid.The results are discussed in terms of the surface structures of silica gel and alumina.
Cycloadditions of Allyl Cations. 25. Acid Catalyzed Dehydrative Cyclodimerization of 2,4-Dimethyl-3-penten-2-ol in Two Phases. Biomimetic One-Pot Preparation of 3,3,5,5-Tetramethyllimonene (4-Isopropenyl-1,3,3,5,5-pentamethyl-1-cyclohexene)
Hoffmann, H. M. R.,Vathke-Ernst, Heidrun
, p. 1182 - 1186 (2007/10/02)
2,4-Dimethyl-3-penten-2-ol (1) wurde in einer Mischung von waessriger Sulfonsaeure/Pentan bei Raumtemperatur geruehrt.Es bildete sich 3,3,5,5-Tetramethyllimonen (2) in hoher Ausbeute. 2 wurde in sein Epoxid (3) (4-Isopropenyl-1,3,3,5,5-pentamethyl-7-oxabicycloheptan) umgewandelt.
