Cyclohexanol → 4-(Bromomethyl)cyclohexan-1-ol

Modified polyvinylbutryal containing a pendant group with cyclohexanol was prepared by the reaction of PVB with tetrahydropyranyl (THP) protected bromomethylcyclohexanol, followed by acid hydrolysis of the THP protection group. The THP-protected cyclohexanol-containing moiety was prepared by the following reaction sequence: 4-Methoxycyclohexanoic acid was reduced with borane-tetrahydrofuran complex to obtain 4-bromomethyl-cyclohexanol. This compound was treated with phosphorus tribromide to obtain the corresponding bromo compound. This bromo compound was reacted with trimethylsilyliodide to cleave the methoxy group to obtain 4-bromomethyl-cyclohexanol, which in turn was treated with dihyhdropyran to obtain the tetrahydropyranyl-protected bromomethylcyclohexanol. This preparation is represented by the following reaction scheme and further described in paragraphs a-d below. ##STR3## a) Preparation of 4-bromomethylcyclohexanol (C-3)

1. customwas prepared by the reaction of PVB with tetrahydropyranyl (THP)
2. customwas prepared by the following reaction sequence

ORD-Eintrag

ord-78c9071ac414486f9393e4b9e93d513a

Quelldatensatz

uspto-grants-1998_05

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05750300