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    • 2. 发明授权
    • Process for preparing isochroman compounds
    • 异苯并二氢吡喃化合物的制备方法
    • US5912362A
    • 1999-06-15
    • US945798
    • 1997-11-10
    • Shigeyoshi TanakaMasayuki OkuJunji Koshino
    • Shigeyoshi TanakaMasayuki OkuJunji Koshino
    • B01J27/10C07B61/00C07D311/76C07D311/78C07D311/92
    • C07D311/76C07D311/78
    • High-purity isochroman compounds can be obtained in high yields according to a simple and economical process for preparing isochroman compounds, comprising the step of adding an aquesous solution of formaldehyde having a concentration of 40 to 70 wt. % to a complex of an arylalkanol represented by the following general formula (II) with a Friedel-Crafts catalyst to cyclize the arylalkanol: ##STR1## wherein R.sub.1 and R.sub.2 each stands for a hydrogen atom, a lower alkyl group or a lower alkoxyl group, or alternatively R.sub.1 and R.sub.2 are respectively bonded to adjacent carbon atoms with mutual bonding of R.sub.1 and R.sub.2 together with the carbon atoms respectively bonded to R.sub.1 and R.sub.2 to form a benzene ring, a naphthalene ring, or a C.sub.5 or C.sub.6 cycloalkane or cycloalkene which may have 1 to 6 lower alkyl groups; and R.sub.3 stands for a hydrogen atom or a lower alkyl group.
    • PCT No.PCT / JP96 / 01088 Sec。 371日期:1997年11月10日 102(e)日期1997年11月10日PCT 1996年4月22日PCT PCT。 公开号WO96 / 35684 日期1996年11月14日根据制备异苯并二氢吡喃化合物的简单和经济的方法,可以高产率获得高纯度异苯并二氢吡喃化合物,其包括加入浓度为40-70重量%的甲醛水溶液的步骤。 %与由以下通式(II)表示的芳基烷醇与Friedel-Crafts催化剂的络合物,使芳基烷醇环化:其中R 1和R 2各自代表氢原子,低级烷基或低级烷氧基,或者另外 R1和R2分别与相邻的碳原子键合,R1和R2与分别键合到R1和R2的碳原子相互键合形成苯环,萘环或C5或C6环烷烃或环烯烃,其可以具有1个 至6个低级烷基; R3表示氢原子或低级烷基。
    • 7. 发明授权
    • Process for production of 5-arylpentanols
    • 5-芳基戊醇的制备方法
    • US06600079B2
    • 2003-07-29
    • US10254661
    • 2002-09-26
    • Akira UmadaShigeyoshi Tanaka
    • Akira UmadaShigeyoshi Tanaka
    • C07C2700
    • C07C29/17C07C33/20
    • A process for producing a 5-arylpentanol of formula (2): wherein R1 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, R3 represents a hydrogen atom, or an alkyl or alkenyl group of 1 to 6 carbon atoms, and R4 represents R2 defined below when R2 is a monovalent group or represents R2H when R2 is a divalent group, which comprises effecting hydrogenolysis of a pyran compound of formula (1): wherein, R1 and R3 are as defined above, R2 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.
    • 一种制备式(2)的5-芳基戊醇的方法:其中R 1表示可被一个或两个或多个烷基或烷氧基取代并且总共具有6至12个碳原子的芳基,R 3表示氢 原子或1〜6个碳原子的烷基或烯基,R4表示当R2为一价基团时定义的R2,或R2表示二价基团时为R2H,其包括使式(1)的吡喃化合物进行氢解, 其中,R 1和R 3如上定义,R 2表示氢原子,1〜6个碳原子的烷基或链烯基或碳原子数为1〜6的亚烷基或亚链烯基,虚线表示可能的键 并且在一种或多种催化剂的存在下,由虚线和实线表示的三个键中的任一个是双键,所述催化剂选自(a)载有选自元素周期表中第Ⅷ族中的贵金属的两种或更多种元素的催化剂 和(b)酸型钯 - 移植催化剂。 5-芳基戊醇可以以高产率制备,低产烃量,而不会对工艺设备的腐蚀造成问题。