View all references and also environmentally friendly catalysts (eg, bentonitic clay2222. Cruz??Almanza , R. , Perez??Flores , FJ and Avila , M. 1990. Deprotection of tetrahydropyranyl ethers with a Mexican bentonite. Synthesis of farnesylhydroquinone. Synth. Commun., 20: 1125 [Taylor & Francis Online], [Web of Science ®] View all references and heteropolyacid1313. Molnár , Á. and Beregszászi , T. 1996. Mild and efficient tetrahydropyranylation and deprotection ...