申请人:KAO CORPORATION
公开号:US20030060667A1
公开(公告)日:2003-03-27
A process for producing a 5-arylpentanol of formula (2):
1
wherein R
1
represents an aryl group which may be substituted with one or two or more of an alkyl or alkoxy group and has 6 to 12 carbon atoms in total, R
3
represents a hydrogen atom, or an alkyl or alkenyl group of 1 to 6 carbon atoms, and R
4
represents R
2
defined below when R
2
is a monovalent group or represents R
2
H when R
2
is a divalent group, which comprises effecting hydrogenolysis of a pyran compound of formula (1):
2
wherein, R
1
and R
3
are as defined above, R
2
represents a hydrogen atom, an alkyl or alkenyl group of 1 to 6 carbon atoms, or an alkylidene or alkenylidene group of 1 to 6 carbon atoms, and a dotted line represents a possible bond and any one of the three bonds represented by dotted lines and solid lines is a double bond, in the presence of one or more catalysts selected from (a) a catalyst carrying two or more elements selected from noble metals in Group VIII in the periodic table and (b) an acid type palladium-supporting catalyst. 5-arylpentanols can be prepared in a high yield with low production of hydrocarbons without causing a problem with regard to corrosion of process equipment.
生产5-芳基戊醇的过程,其中R1代表一个芳基,可能被一个或两个或更多的烷基或烷氧基取代,在总共6到12个碳原子中,R3代表氢原子,或者1到6个碳原子的烷基或烯基,R4代表下面定义的R2,当R2是一价基团时,或者当R2是二价基团时代表R2H,包括在存在以下催化剂的作用下,对公式(1)的吡喃化合物进行氢解:其中,R1和R3如上定义,R2代表氢原子,1到6个碳原子的烷基或烯基,或者1到6个碳原子的烷基亚烯基或烯基亚烯基,虚线代表可能的键,虚线和实线代表的三个键中的任意一个是双键,在选择的一个或更多的催化剂的存在下进行,所述催化剂选择自(a)周期表中贵金属8族元素的两个或更多元素携带的催化剂和(b)酸性钯载体催化剂。5-芳基戊醇可以在高产率的情况下制备,同时产生低碳氢化合物的生产,而不会引起与工艺设备腐蚀相关的问题。