| abstract |
NEW MATERIAL:4a,5,6,7,8,8a-Hexahydro-4,7-dimethyl-4H-1-benzopyrane of formula I. n USE: Perfume having an odor like peppermint oil and being useful for soap, detergent, deodorant because when it is blended with menthol or anethol the mix shows elegant and neat smell. n PREPARATION: The hydroformylation of isopregol of formula II with carbon monoxide and hydrogen in a solvent as hexane or THF is effected in the presence of a Rh catalyst as RhX(PR 3 ) 3 (X is Cl, I; R is 1W10C aliphatics) or cobalt catalyst as Raney cobalt, preferably at 90W170°C and 30W170 kg/cm 2 . The product passes through compounds of formula III and IV and becomes the one of formula I. The addition of a tertiary phosphine of formula V (R 1W3 are aliphatics) can inhibit the decomposition of the catalyst and lower the reaction pressure. n COPYRIGHT: (C)1980,JPO&Japio |