公开(公告)号：US3845135A

公开(公告)日：1974-10-29

申请号：US14134871

申请日：1971-05-07

Applicant: BASF AG

Inventor： HOFFMANN W ,  RISCHER R

IPC: C07C20060101 ,  C07C45/00 ,  C07C403/00 ,  C07C49/48

CPC classification number: C07C403/16 ,  C07C2601/16

Abstract: 1. A CONTINUOUS PROCESS FOR THE MANUFACTURE OF B-IONONE OF FORMULA I
AND R1, AND R2 AND R3 HAVE THE MEANINGS STATED ABOVE, ARE CYCLIZED AND CYCLIZATION IS CARRIED OUT IN THE TEMPERATURE RANGE-30* TO +20* C. AND IN THE PRESENCE OF MIXTURES OF HYDOCARBONS WHICH ARE LIQUIDS UNDER THE CONDITIONS OF THE REACTION AND WHICH BOIL AT TEMPERATURES BELOW 200* C. AT ATMOSPHERIC PRESSURE SELECTED FROM THE GROUP CONSISTING OF METHANE, ETHANE, PROPANE, BUTANE, PENTANE, HEXANE, CYCLOHEXANE, BENZENE AND XYLENE AND LOWER ALIPHATIC ALCOHOLS SELECTED FROM THE GROUP CONSISTING OF ALKANOLS OF 1 TO 6 CARBON ATOMS, ETHYLENE GLYCOL AND PROPYLENE GLYCOL, THE MOLAR RATIO OFF PSUEDO-IONONE TO HYDROCARBON BEING ABOUT 1:1-17, THAT OFF PSEUDO-IONONE TO ALCOHOL BEING 1:0.5-2 AND THAT OF PSEUDO-IONONE TO SULFURIC ACID BEING 1:7-12, THE SULFURIC ACID USED HAVING A STRENGTH OF FROM 90 TO 98%.
-CH(-R1)=C(-CH3)2 OR

1-R1,2,2,4-TRI(H3C-),3-(R3-CH2-CO-C(-R2)=CH-)-

CYCLOHEX-3-ENE

IN WHICH R1, R2 AND R3 DENOTE HYDROGEN OR METHYL, BY CYCLIZATION OF PSUEDO-IONONES WITH SULFURIC ACID, WHEREIN PSUEDO-IONONES OF FORMULA II

X-CH2-CH2-C(-CH3)=CH-CH=C(-R2)-CO-CH2-R3

IN WHICH X DENOTES RADICALS OF THE FORMULAE:

-CH(-R1)-C(-CH3)=CH2


-CH(-R1)-C(-CH3)2-O-CH3